// NOTE: This is mostly copied from https://github.com/sunsama/tsdav/tree/cc1c5a09b64c87bbee7e5f171cfcb6748e99469e/dist/tsdav.js and the goal would be to re-implement it as a much simpler class with only the necessary functionality, here. (https://github.com/bewcloud/bewcloud/issues/97)
var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function getDefaultExportFromCjs (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

function getAugmentedNamespace(n) {
  if (n.__esModule) return n;
  var f = n.default;
	if (typeof f == "function") {
		var a = function a () {
			if (this instanceof a) {
        return Reflect.construct(f, arguments, this.constructor);
			}
			return f.apply(this, arguments);
		};
		a.prototype = f.prototype;
  } else a = {};
  Object.defineProperty(a, '__esModule', {value: true});
	Object.keys(n).forEach(function (k) {
		var d = Object.getOwnPropertyDescriptor(n, k);
		Object.defineProperty(a, k, d.get ? d : {
			enumerable: true,
			get: function () {
				return n[k];
			}
		});
	});
	return a;
}

var browserPonyfill = {exports: {}};

var hasRequiredBrowserPonyfill;

function requireBrowserPonyfill () {
	if (hasRequiredBrowserPonyfill) return browserPonyfill.exports;
	hasRequiredBrowserPonyfill = 1;
	(function (module, exports) {
		// Save global object in a variable
		var __global__ =
		(typeof globalThis !== 'undefined' && globalThis) ||
		(typeof self !== 'undefined' && self) ||
		(typeof commonjsGlobal !== 'undefined' && commonjsGlobal);
		// Create an object that extends from __global__ without the fetch function
		var __globalThis__ = (function () {
		function F() {
		this.fetch = false;
		this.DOMException = __global__.DOMException;
		}
		F.prototype = __global__; // Needed for feature detection on whatwg-fetch's code
		return new F();
		})();
		// Wraps whatwg-fetch with a function scope to hijack the global object
		// "globalThis" that's going to be patched
		(function(globalThis) {

		((function (exports) {

		  var global =
		    (typeof globalThis !== 'undefined' && globalThis) ||
		    (typeof self !== 'undefined' && self) ||
		    (typeof global !== 'undefined' && global);

		  var support = {
		    searchParams: 'URLSearchParams' in global,
		    iterable: 'Symbol' in global && 'iterator' in Symbol,
		    blob:
		      'FileReader' in global &&
		      'Blob' in global &&
		      (function() {
		        try {
		          new Blob();
		          return true
		        } catch (e) {
		          return false
		        }
		      })(),
		    formData: 'FormData' in global,
		    arrayBuffer: 'ArrayBuffer' in global
		  };

		  function isDataView(obj) {
		    return obj && DataView.prototype.isPrototypeOf(obj)
		  }

		  if (support.arrayBuffer) {
		    var viewClasses = [
		      '[object Int8Array]',
		      '[object Uint8Array]',
		      '[object Uint8ClampedArray]',
		      '[object Int16Array]',
		      '[object Uint16Array]',
		      '[object Int32Array]',
		      '[object Uint32Array]',
		      '[object Float32Array]',
		      '[object Float64Array]'
		    ];

		    var isArrayBufferView =
		      ArrayBuffer.isView ||
		      function(obj) {
		        return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
		      };
		  }

		  function normalizeName(name) {
		    if (typeof name !== 'string') {
		      name = String(name);
		    }
		    if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
		      throw new TypeError('Invalid character in header field name: "' + name + '"')
		    }
		    return name.toLowerCase()
		  }

		  function normalizeValue(value) {
		    if (typeof value !== 'string') {
		      value = String(value);
		    }
		    return value
		  }

		  // Build a destructive iterator for the value list
		  function iteratorFor(items) {
		    var iterator = {
		      next: function() {
		        var value = items.shift();
		        return {done: value === undefined, value: value}
		      }
		    };

		    if (support.iterable) {
		      iterator[Symbol.iterator] = function() {
		        return iterator
		      };
		    }

		    return iterator
		  }

		  function Headers(headers) {
		    this.map = {};

		    if (headers instanceof Headers) {
		      headers.forEach(function(value, name) {
		        this.append(name, value);
		      }, this);
		    } else if (Array.isArray(headers)) {
		      headers.forEach(function(header) {
		        this.append(header[0], header[1]);
		      }, this);
		    } else if (headers) {
		      Object.getOwnPropertyNames(headers).forEach(function(name) {
		        this.append(name, headers[name]);
		      }, this);
		    }
		  }

		  Headers.prototype.append = function(name, value) {
		    name = normalizeName(name);
		    value = normalizeValue(value);
		    var oldValue = this.map[name];
		    this.map[name] = oldValue ? oldValue + ', ' + value : value;
		  };

		  Headers.prototype['delete'] = function(name) {
		    delete this.map[normalizeName(name)];
		  };

		  Headers.prototype.get = function(name) {
		    name = normalizeName(name);
		    return this.has(name) ? this.map[name] : null
		  };

		  Headers.prototype.has = function(name) {
		    return this.map.hasOwnProperty(normalizeName(name))
		  };

		  Headers.prototype.set = function(name, value) {
		    this.map[normalizeName(name)] = normalizeValue(value);
		  };

		  Headers.prototype.forEach = function(callback, thisArg) {
		    for (var name in this.map) {
		      if (this.map.hasOwnProperty(name)) {
		        callback.call(thisArg, this.map[name], name, this);
		      }
		    }
		  };

		  Headers.prototype.keys = function() {
		    var items = [];
		    this.forEach(function(value, name) {
		      items.push(name);
		    });
		    return iteratorFor(items)
		  };

		  Headers.prototype.values = function() {
		    var items = [];
		    this.forEach(function(value) {
		      items.push(value);
		    });
		    return iteratorFor(items)
		  };

		  Headers.prototype.entries = function() {
		    var items = [];
		    this.forEach(function(value, name) {
		      items.push([name, value]);
		    });
		    return iteratorFor(items)
		  };

		  if (support.iterable) {
		    Headers.prototype[Symbol.iterator] = Headers.prototype.entries;
		  }

		  function consumed(body) {
		    if (body.bodyUsed) {
		      return Promise.reject(new TypeError('Already read'))
		    }
		    body.bodyUsed = true;
		  }

		  function fileReaderReady(reader) {
		    return new Promise(function(resolve, reject) {
		      reader.onload = function() {
		        resolve(reader.result);
		      };
		      reader.onerror = function() {
		        reject(reader.error);
		      };
		    })
		  }

		  function readBlobAsArrayBuffer(blob) {
		    var reader = new FileReader();
		    var promise = fileReaderReady(reader);
		    reader.readAsArrayBuffer(blob);
		    return promise
		  }

		  function readBlobAsText(blob) {
		    var reader = new FileReader();
		    var promise = fileReaderReady(reader);
		    reader.readAsText(blob);
		    return promise
		  }

		  function readArrayBufferAsText(buf) {
		    var view = new Uint8Array(buf);
		    var chars = new Array(view.length);

		    for (var i = 0; i < view.length; i++) {
		      chars[i] = String.fromCharCode(view[i]);
		    }
		    return chars.join('')
		  }

		  function bufferClone(buf) {
		    if (buf.slice) {
		      return buf.slice(0)
		    } else {
		      var view = new Uint8Array(buf.byteLength);
		      view.set(new Uint8Array(buf));
		      return view.buffer
		    }
		  }

		  function Body() {
		    this.bodyUsed = false;

		    this._initBody = function(body) {
		      /*
		        fetch-mock wraps the Response object in an ES6 Proxy to
		        provide useful test harness features such as flush. However, on
		        ES5 browsers without fetch or Proxy support pollyfills must be used;
		        the proxy-pollyfill is unable to proxy an attribute unless it exists
		        on the object before the Proxy is created. This change ensures
		        Response.bodyUsed exists on the instance, while maintaining the
		        semantic of setting Request.bodyUsed in the constructor before
		        _initBody is called.
		      */
		      this.bodyUsed = this.bodyUsed;
		      this._bodyInit = body;
		      if (!body) {
		        this._bodyText = '';
		      } else if (typeof body === 'string') {
		        this._bodyText = body;
		      } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
		        this._bodyBlob = body;
		      } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
		        this._bodyFormData = body;
		      } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
		        this._bodyText = body.toString();
		      } else if (support.arrayBuffer && support.blob && isDataView(body)) {
		        this._bodyArrayBuffer = bufferClone(body.buffer);
		        // IE 10-11 can't handle a DataView body.
		        this._bodyInit = new Blob([this._bodyArrayBuffer]);
		      } else if (support.arrayBuffer && (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))) {
		        this._bodyArrayBuffer = bufferClone(body);
		      } else {
		        this._bodyText = body = Object.prototype.toString.call(body);
		      }

		      if (!this.headers.get('content-type')) {
		        if (typeof body === 'string') {
		          this.headers.set('content-type', 'text/plain;charset=UTF-8');
		        } else if (this._bodyBlob && this._bodyBlob.type) {
		          this.headers.set('content-type', this._bodyBlob.type);
		        } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
		          this.headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8');
		        }
		      }
		    };

		    if (support.blob) {
		      this.blob = function() {
		        var rejected = consumed(this);
		        if (rejected) {
		          return rejected
		        }

		        if (this._bodyBlob) {
		          return Promise.resolve(this._bodyBlob)
		        } else if (this._bodyArrayBuffer) {
		          return Promise.resolve(new Blob([this._bodyArrayBuffer]))
		        } else if (this._bodyFormData) {
		          throw new Error('could not read FormData body as blob')
		        } else {
		          return Promise.resolve(new Blob([this._bodyText]))
		        }
		      };

		      this.arrayBuffer = function() {
		        if (this._bodyArrayBuffer) {
		          var isConsumed = consumed(this);
		          if (isConsumed) {
		            return isConsumed
		          }
		          if (ArrayBuffer.isView(this._bodyArrayBuffer)) {
		            return Promise.resolve(
		              this._bodyArrayBuffer.buffer.slice(
		                this._bodyArrayBuffer.byteOffset,
		                this._bodyArrayBuffer.byteOffset + this._bodyArrayBuffer.byteLength
		              )
		            )
		          } else {
		            return Promise.resolve(this._bodyArrayBuffer)
		          }
		        } else {
		          return this.blob().then(readBlobAsArrayBuffer)
		        }
		      };
		    }

		    this.text = function() {
		      var rejected = consumed(this);
		      if (rejected) {
		        return rejected
		      }

		      if (this._bodyBlob) {
		        return readBlobAsText(this._bodyBlob)
		      } else if (this._bodyArrayBuffer) {
		        return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))
		      } else if (this._bodyFormData) {
		        throw new Error('could not read FormData body as text')
		      } else {
		        return Promise.resolve(this._bodyText)
		      }
		    };

		    if (support.formData) {
		      this.formData = function() {
		        return this.text().then(decode)
		      };
		    }

		    this.json = function() {
		      return this.text().then(JSON.parse)
		    };

		    return this
		  }

		  // HTTP methods whose capitalization should be normalized
		  var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT'];

		  function normalizeMethod(method) {
		    var upcased = method.toUpperCase();
		    return methods.indexOf(upcased) > -1 ? upcased : method
		  }

		  function Request(input, options) {
		    if (!(this instanceof Request)) {
		      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
		    }

		    options = options || {};
		    var body = options.body;

		    if (input instanceof Request) {
		      if (input.bodyUsed) {
		        throw new TypeError('Already read')
		      }
		      this.url = input.url;
		      this.credentials = input.credentials;
		      if (!options.headers) {
		        this.headers = new Headers(input.headers);
		      }
		      this.method = input.method;
		      this.mode = input.mode;
		      this.signal = input.signal;
		      if (!body && input._bodyInit != null) {
		        body = input._bodyInit;
		        input.bodyUsed = true;
		      }
		    } else {
		      this.url = String(input);
		    }

		    this.credentials = options.credentials || this.credentials || 'same-origin';
		    if (options.headers || !this.headers) {
		      this.headers = new Headers(options.headers);
		    }
		    this.method = normalizeMethod(options.method || this.method || 'GET');
		    this.mode = options.mode || this.mode || null;
		    this.signal = options.signal || this.signal;
		    this.referrer = null;

		    if ((this.method === 'GET' || this.method === 'HEAD') && body) {
		      throw new TypeError('Body not allowed for GET or HEAD requests')
		    }
		    this._initBody(body);

		    if (this.method === 'GET' || this.method === 'HEAD') {
		      if (options.cache === 'no-store' || options.cache === 'no-cache') {
		        // Search for a '_' parameter in the query string
		        var reParamSearch = /([?&])_=[^&]*/;
		        if (reParamSearch.test(this.url)) {
		          // If it already exists then set the value with the current time
		          this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime());
		        } else {
		          // Otherwise add a new '_' parameter to the end with the current time
		          var reQueryString = /\?/;
		          this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime();
		        }
		      }
		    }
		  }

		  Request.prototype.clone = function() {
		    return new Request(this, {body: this._bodyInit})
		  };

		  function decode(body) {
		    var form = new FormData();
		    body
		      .trim()
		      .split('&')
		      .forEach(function(bytes) {
		        if (bytes) {
		          var split = bytes.split('=');
		          var name = split.shift().replace(/\+/g, ' ');
		          var value = split.join('=').replace(/\+/g, ' ');
		          form.append(decodeURIComponent(name), decodeURIComponent(value));
		        }
		      });
		    return form
		  }

		  function parseHeaders(rawHeaders) {
		    var headers = new Headers();
		    // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
		    // https://tools.ietf.org/html/rfc7230#section-3.2
		    var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, ' ');
		    // Avoiding split via regex to work around a common IE11 bug with the core-js 3.6.0 regex polyfill
		    // https://github.com/github/fetch/issues/748
		    // https://github.com/zloirock/core-js/issues/751
		    preProcessedHeaders
		      .split('\r')
		      .map(function(header) {
		        return header.indexOf('\n') === 0 ? header.substr(1, header.length) : header
		      })
		      .forEach(function(line) {
		        var parts = line.split(':');
		        var key = parts.shift().trim();
		        if (key) {
		          var value = parts.join(':').trim();
		          headers.append(key, value);
		        }
		      });
		    return headers
		  }

		  Body.call(Request.prototype);

		  function Response(bodyInit, options) {
		    if (!(this instanceof Response)) {
		      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
		    }
		    if (!options) {
		      options = {};
		    }

		    this.type = 'default';
		    this.status = options.status === undefined ? 200 : options.status;
		    this.ok = this.status >= 200 && this.status < 300;
		    this.statusText = options.statusText === undefined ? '' : '' + options.statusText;
		    this.headers = new Headers(options.headers);
		    this.url = options.url || '';
		    this._initBody(bodyInit);
		  }

		  Body.call(Response.prototype);

		  Response.prototype.clone = function() {
		    return new Response(this._bodyInit, {
		      status: this.status,
		      statusText: this.statusText,
		      headers: new Headers(this.headers),
		      url: this.url
		    })
		  };

		  Response.error = function() {
		    var response = new Response(null, {status: 0, statusText: ''});
		    response.type = 'error';
		    return response
		  };

		  var redirectStatuses = [301, 302, 303, 307, 308];

		  Response.redirect = function(url, status) {
		    if (redirectStatuses.indexOf(status) === -1) {
		      throw new RangeError('Invalid status code')
		    }

		    return new Response(null, {status: status, headers: {location: url}})
		  };

		  exports.DOMException = global.DOMException;
		  try {
		    new exports.DOMException();
		  } catch (err) {
		    exports.DOMException = function(message, name) {
		      this.message = message;
		      this.name = name;
		      var error = Error(message);
		      this.stack = error.stack;
		    };
		    exports.DOMException.prototype = Object.create(Error.prototype);
		    exports.DOMException.prototype.constructor = exports.DOMException;
		  }

		  function fetch(input, init) {
		    return new Promise(function(resolve, reject) {
		      var request = new Request(input, init);

		      if (request.signal && request.signal.aborted) {
		        return reject(new exports.DOMException('Aborted', 'AbortError'))
		      }

		      var xhr = new XMLHttpRequest();

		      function abortXhr() {
		        xhr.abort();
		      }

		      xhr.onload = function() {
		        var options = {
		          status: xhr.status,
		          statusText: xhr.statusText,
		          headers: parseHeaders(xhr.getAllResponseHeaders() || '')
		        };
		        options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL');
		        var body = 'response' in xhr ? xhr.response : xhr.responseText;
		        setTimeout(function() {
		          resolve(new Response(body, options));
		        }, 0);
		      };

		      xhr.onerror = function() {
		        setTimeout(function() {
		          reject(new TypeError('Network request failed'));
		        }, 0);
		      };

		      xhr.ontimeout = function() {
		        setTimeout(function() {
		          reject(new TypeError('Network request failed'));
		        }, 0);
		      };

		      xhr.onabort = function() {
		        setTimeout(function() {
		          reject(new exports.DOMException('Aborted', 'AbortError'));
		        }, 0);
		      };

		      function fixUrl(url) {
		        try {
		          return url === '' && global.location.href ? global.location.href : url
		        } catch (e) {
		          return url
		        }
		      }

		      xhr.open(request.method, fixUrl(request.url), true);

		      if (request.credentials === 'include') {
		        xhr.withCredentials = true;
		      } else if (request.credentials === 'omit') {
		        xhr.withCredentials = false;
		      }

		      if ('responseType' in xhr) {
		        if (support.blob) {
		          xhr.responseType = 'blob';
		        } else if (
		          support.arrayBuffer &&
		          request.headers.get('Content-Type') &&
		          request.headers.get('Content-Type').indexOf('application/octet-stream') !== -1
		        ) {
		          xhr.responseType = 'arraybuffer';
		        }
		      }

		      if (init && typeof init.headers === 'object' && !(init.headers instanceof Headers)) {
		        Object.getOwnPropertyNames(init.headers).forEach(function(name) {
		          xhr.setRequestHeader(name, normalizeValue(init.headers[name]));
		        });
		      } else {
		        request.headers.forEach(function(value, name) {
		          xhr.setRequestHeader(name, value);
		        });
		      }

		      if (request.signal) {
		        request.signal.addEventListener('abort', abortXhr);

		        xhr.onreadystatechange = function() {
		          // DONE (success or failure)
		          if (xhr.readyState === 4) {
		            request.signal.removeEventListener('abort', abortXhr);
		          }
		        };
		      }

		      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
		    })
		  }

		  fetch.polyfill = true;

		  if (!global.fetch) {
		    global.fetch = fetch;
		    global.Headers = Headers;
		    global.Request = Request;
		    global.Response = Response;
		  }

		  exports.Headers = Headers;
		  exports.Request = Request;
		  exports.Response = Response;
		  exports.fetch = fetch;

		  return exports;

		}))({});
		})(__globalThis__);
		// This is a ponyfill, so...
		__globalThis__.fetch.ponyfill = true;
		delete __globalThis__.fetch.polyfill;
		// Choose between native implementation (__global__) or custom implementation (__globalThis__)
		var ctx = __global__.fetch ? __global__ : __globalThis__;
		exports = ctx.fetch; // To enable: import fetch from 'cross-fetch'
		exports.default = ctx.fetch; // For TypeScript consumers without esModuleInterop.
		exports.fetch = ctx.fetch; // To enable: import {fetch} from 'cross-fetch'
		exports.Headers = ctx.Headers;
		exports.Request = ctx.Request;
		exports.Response = ctx.Response;
		module.exports = exports; 
	} (browserPonyfill, browserPonyfill.exports));
	return browserPonyfill.exports;
}

var browserPonyfillExports = requireBrowserPonyfill();

var global$1 = (typeof global !== "undefined" ? global :
  typeof self !== "undefined" ? self :
  typeof window !== "undefined" ? window : {});

// shim for using process in browser
// based off https://github.com/defunctzombie/node-process/blob/master/browser.js

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
var cachedSetTimeout = defaultSetTimout;
var cachedClearTimeout = defaultClearTimeout;
if (typeof global$1.setTimeout === 'function') {
    cachedSetTimeout = setTimeout;
}
if (typeof global$1.clearTimeout === 'function') {
    cachedClearTimeout = clearTimeout;
}

function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}
function nextTick(fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
}
// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
var title = 'browser';
var platform = 'browser';
var browser$1 = true;
var env = {};
var argv = [];
var version = ''; // empty string to avoid regexp issues
var versions = {};
var release = {};
var config = {};

function noop() {}

var on = noop;
var addListener = noop;
var once = noop;
var off = noop;
var removeListener = noop;
var removeAllListeners = noop;
var emit = noop;

function binding(name) {
    throw new Error('process.binding is not supported');
}

function cwd () { return '/' }
function chdir (dir) {
    throw new Error('process.chdir is not supported');
}function umask() { return 0; }

// from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js
var performance = global$1.performance || {};
var performanceNow =
  performance.now        ||
  performance.mozNow     ||
  performance.msNow      ||
  performance.oNow       ||
  performance.webkitNow  ||
  function(){ return (new Date()).getTime() };

// generate timestamp or delta
// see http://nodejs.org/api/process.html#process_process_hrtime
function hrtime(previousTimestamp){
  var clocktime = performanceNow.call(performance)*1e-3;
  var seconds = Math.floor(clocktime);
  var nanoseconds = Math.floor((clocktime%1)*1e9);
  if (previousTimestamp) {
    seconds = seconds - previousTimestamp[0];
    nanoseconds = nanoseconds - previousTimestamp[1];
    if (nanoseconds<0) {
      seconds--;
      nanoseconds += 1e9;
    }
  }
  return [seconds,nanoseconds]
}

var startTime = new Date();
function uptime() {
  var currentTime = new Date();
  var dif = currentTime - startTime;
  return dif / 1000;
}

var browser$1$1 = {
  nextTick: nextTick,
  title: title,
  browser: browser$1,
  env: env,
  argv: argv,
  version: version,
  versions: versions,
  on: on,
  addListener: addListener,
  once: once,
  off: off,
  removeListener: removeListener,
  removeAllListeners: removeAllListeners,
  emit: emit,
  binding: binding,
  cwd: cwd,
  chdir: chdir,
  umask: umask,
  hrtime: hrtime,
  platform: platform,
  release: release,
  config: config,
  uptime: uptime
};

var browser = {exports: {}};

/**
 * Helpers.
 */

var ms;
var hasRequiredMs;

function requireMs () {
	if (hasRequiredMs) return ms;
	hasRequiredMs = 1;
	var s = 1000;
	var m = s * 60;
	var h = m * 60;
	var d = h * 24;
	var w = d * 7;
	var y = d * 365.25;

	/**
	 * Parse or format the given `val`.
	 *
	 * Options:
	 *
	 *  - `long` verbose formatting [false]
	 *
	 * @param {String|Number} val
	 * @param {Object} [options]
	 * @throws {Error} throw an error if val is not a non-empty string or a number
	 * @return {String|Number}
	 * @api public
	 */

	ms = function(val, options) {
	  options = options || {};
	  var type = typeof val;
	  if (type === 'string' && val.length > 0) {
	    return parse(val);
	  } else if (type === 'number' && isFinite(val)) {
	    return options.long ? fmtLong(val) : fmtShort(val);
	  }
	  throw new Error(
	    'val is not a non-empty string or a valid number. val=' +
	      JSON.stringify(val)
	  );
	};

	/**
	 * Parse the given `str` and return milliseconds.
	 *
	 * @param {String} str
	 * @return {Number}
	 * @api private
	 */

	function parse(str) {
	  str = String(str);
	  if (str.length > 100) {
	    return;
	  }
	  var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
	    str
	  );
	  if (!match) {
	    return;
	  }
	  var n = parseFloat(match[1]);
	  var type = (match[2] || 'ms').toLowerCase();
	  switch (type) {
	    case 'years':
	    case 'year':
	    case 'yrs':
	    case 'yr':
	    case 'y':
	      return n * y;
	    case 'weeks':
	    case 'week':
	    case 'w':
	      return n * w;
	    case 'days':
	    case 'day':
	    case 'd':
	      return n * d;
	    case 'hours':
	    case 'hour':
	    case 'hrs':
	    case 'hr':
	    case 'h':
	      return n * h;
	    case 'minutes':
	    case 'minute':
	    case 'mins':
	    case 'min':
	    case 'm':
	      return n * m;
	    case 'seconds':
	    case 'second':
	    case 'secs':
	    case 'sec':
	    case 's':
	      return n * s;
	    case 'milliseconds':
	    case 'millisecond':
	    case 'msecs':
	    case 'msec':
	    case 'ms':
	      return n;
	    default:
	      return undefined;
	  }
	}

	/**
	 * Short format for `ms`.
	 *
	 * @param {Number} ms
	 * @return {String}
	 * @api private
	 */

	function fmtShort(ms) {
	  var msAbs = Math.abs(ms);
	  if (msAbs >= d) {
	    return Math.round(ms / d) + 'd';
	  }
	  if (msAbs >= h) {
	    return Math.round(ms / h) + 'h';
	  }
	  if (msAbs >= m) {
	    return Math.round(ms / m) + 'm';
	  }
	  if (msAbs >= s) {
	    return Math.round(ms / s) + 's';
	  }
	  return ms + 'ms';
	}

	/**
	 * Long format for `ms`.
	 *
	 * @param {Number} ms
	 * @return {String}
	 * @api private
	 */

	function fmtLong(ms) {
	  var msAbs = Math.abs(ms);
	  if (msAbs >= d) {
	    return plural(ms, msAbs, d, 'day');
	  }
	  if (msAbs >= h) {
	    return plural(ms, msAbs, h, 'hour');
	  }
	  if (msAbs >= m) {
	    return plural(ms, msAbs, m, 'minute');
	  }
	  if (msAbs >= s) {
	    return plural(ms, msAbs, s, 'second');
	  }
	  return ms + ' ms';
	}

	/**
	 * Pluralization helper.
	 */

	function plural(ms, msAbs, n, name) {
	  var isPlural = msAbs >= n * 1.5;
	  return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
	}
	return ms;
}

var common;
var hasRequiredCommon;

function requireCommon () {
	if (hasRequiredCommon) return common;
	hasRequiredCommon = 1;
	/**
	 * This is the common logic for both the Node.js and web browser
	 * implementations of `debug()`.
	 */

	function setup(env) {
		createDebug.debug = createDebug;
		createDebug.default = createDebug;
		createDebug.coerce = coerce;
		createDebug.disable = disable;
		createDebug.enable = enable;
		createDebug.enabled = enabled;
		createDebug.humanize = requireMs();
		createDebug.destroy = destroy;

		Object.keys(env).forEach(key => {
			createDebug[key] = env[key];
		});

		/**
		* The currently active debug mode names, and names to skip.
		*/

		createDebug.names = [];
		createDebug.skips = [];

		/**
		* Map of special "%n" handling functions, for the debug "format" argument.
		*
		* Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
		*/
		createDebug.formatters = {};

		/**
		* Selects a color for a debug namespace
		* @param {String} namespace The namespace string for the debug instance to be colored
		* @return {Number|String} An ANSI color code for the given namespace
		* @api private
		*/
		function selectColor(namespace) {
			let hash = 0;

			for (let i = 0; i < namespace.length; i++) {
				hash = ((hash << 5) - hash) + namespace.charCodeAt(i);
				hash |= 0; // Convert to 32bit integer
			}

			return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
		}
		createDebug.selectColor = selectColor;

		/**
		* Create a debugger with the given `namespace`.
		*
		* @param {String} namespace
		* @return {Function}
		* @api public
		*/
		function createDebug(namespace) {
			let prevTime;
			let enableOverride = null;
			let namespacesCache;
			let enabledCache;

			function debug(...args) {
				// Disabled?
				if (!debug.enabled) {
					return;
				}

				const self = debug;

				// Set `diff` timestamp
				const curr = Number(new Date());
				const ms = curr - (prevTime || curr);
				self.diff = ms;
				self.prev = prevTime;
				self.curr = curr;
				prevTime = curr;

				args[0] = createDebug.coerce(args[0]);

				if (typeof args[0] !== 'string') {
					// Anything else let's inspect with %O
					args.unshift('%O');
				}

				// Apply any `formatters` transformations
				let index = 0;
				args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
					// If we encounter an escaped % then don't increase the array index
					if (match === '%%') {
						return '%';
					}
					index++;
					const formatter = createDebug.formatters[format];
					if (typeof formatter === 'function') {
						const val = args[index];
						match = formatter.call(self, val);

						// Now we need to remove `args[index]` since it's inlined in the `format`
						args.splice(index, 1);
						index--;
					}
					return match;
				});

				// Apply env-specific formatting (colors, etc.)
				createDebug.formatArgs.call(self, args);

				const logFn = self.log || createDebug.log;
				logFn.apply(self, args);
			}

			debug.namespace = namespace;
			debug.useColors = createDebug.useColors();
			debug.color = createDebug.selectColor(namespace);
			debug.extend = extend;
			debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.

			Object.defineProperty(debug, 'enabled', {
				enumerable: true,
				configurable: false,
				get: () => {
					if (enableOverride !== null) {
						return enableOverride;
					}
					if (namespacesCache !== createDebug.namespaces) {
						namespacesCache = createDebug.namespaces;
						enabledCache = createDebug.enabled(namespace);
					}

					return enabledCache;
				},
				set: v => {
					enableOverride = v;
				}
			});

			// Env-specific initialization logic for debug instances
			if (typeof createDebug.init === 'function') {
				createDebug.init(debug);
			}

			return debug;
		}

		function extend(namespace, delimiter) {
			const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
			newDebug.log = this.log;
			return newDebug;
		}

		/**
		* Enables a debug mode by namespaces. This can include modes
		* separated by a colon and wildcards.
		*
		* @param {String} namespaces
		* @api public
		*/
		function enable(namespaces) {
			createDebug.save(namespaces);
			createDebug.namespaces = namespaces;

			createDebug.names = [];
			createDebug.skips = [];

			let i;
			const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
			const len = split.length;

			for (i = 0; i < len; i++) {
				if (!split[i]) {
					// ignore empty strings
					continue;
				}

				namespaces = split[i].replace(/\*/g, '.*?');

				if (namespaces[0] === '-') {
					createDebug.skips.push(new RegExp('^' + namespaces.slice(1) + '$'));
				} else {
					createDebug.names.push(new RegExp('^' + namespaces + '$'));
				}
			}
		}

		/**
		* Disable debug output.
		*
		* @return {String} namespaces
		* @api public
		*/
		function disable() {
			const namespaces = [
				...createDebug.names.map(toNamespace),
				...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)
			].join(',');
			createDebug.enable('');
			return namespaces;
		}

		/**
		* Returns true if the given mode name is enabled, false otherwise.
		*
		* @param {String} name
		* @return {Boolean}
		* @api public
		*/
		function enabled(name) {
			if (name[name.length - 1] === '*') {
				return true;
			}

			let i;
			let len;

			for (i = 0, len = createDebug.skips.length; i < len; i++) {
				if (createDebug.skips[i].test(name)) {
					return false;
				}
			}

			for (i = 0, len = createDebug.names.length; i < len; i++) {
				if (createDebug.names[i].test(name)) {
					return true;
				}
			}

			return false;
		}

		/**
		* Convert regexp to namespace
		*
		* @param {RegExp} regxep
		* @return {String} namespace
		* @api private
		*/
		function toNamespace(regexp) {
			return regexp.toString()
				.substring(2, regexp.toString().length - 2)
				.replace(/\.\*\?$/, '*');
		}

		/**
		* Coerce `val`.
		*
		* @param {Mixed} val
		* @return {Mixed}
		* @api private
		*/
		function coerce(val) {
			if (val instanceof Error) {
				return val.stack || val.message;
			}
			return val;
		}

		/**
		* XXX DO NOT USE. This is a temporary stub function.
		* XXX It WILL be removed in the next major release.
		*/
		function destroy() {
			console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
		}

		createDebug.enable(createDebug.load());

		return createDebug;
	}

	common = setup;
	return common;
}

var hasRequiredBrowser;

function requireBrowser () {
	if (hasRequiredBrowser) return browser.exports;
	hasRequiredBrowser = 1;
	(function (module, exports) {
		/**
		 * This is the web browser implementation of `debug()`.
		 */

		exports.formatArgs = formatArgs;
		exports.save = save;
		exports.load = load;
		exports.useColors = useColors;
		exports.storage = localstorage();
		exports.destroy = (() => {
			let warned = false;

			return () => {
				if (!warned) {
					warned = true;
					console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
				}
			};
		})();

		/**
		 * Colors.
		 */

		exports.colors = [
			'#0000CC',
			'#0000FF',
			'#0033CC',
			'#0033FF',
			'#0066CC',
			'#0066FF',
			'#0099CC',
			'#0099FF',
			'#00CC00',
			'#00CC33',
			'#00CC66',
			'#00CC99',
			'#00CCCC',
			'#00CCFF',
			'#3300CC',
			'#3300FF',
			'#3333CC',
			'#3333FF',
			'#3366CC',
			'#3366FF',
			'#3399CC',
			'#3399FF',
			'#33CC00',
			'#33CC33',
			'#33CC66',
			'#33CC99',
			'#33CCCC',
			'#33CCFF',
			'#6600CC',
			'#6600FF',
			'#6633CC',
			'#6633FF',
			'#66CC00',
			'#66CC33',
			'#9900CC',
			'#9900FF',
			'#9933CC',
			'#9933FF',
			'#99CC00',
			'#99CC33',
			'#CC0000',
			'#CC0033',
			'#CC0066',
			'#CC0099',
			'#CC00CC',
			'#CC00FF',
			'#CC3300',
			'#CC3333',
			'#CC3366',
			'#CC3399',
			'#CC33CC',
			'#CC33FF',
			'#CC6600',
			'#CC6633',
			'#CC9900',
			'#CC9933',
			'#CCCC00',
			'#CCCC33',
			'#FF0000',
			'#FF0033',
			'#FF0066',
			'#FF0099',
			'#FF00CC',
			'#FF00FF',
			'#FF3300',
			'#FF3333',
			'#FF3366',
			'#FF3399',
			'#FF33CC',
			'#FF33FF',
			'#FF6600',
			'#FF6633',
			'#FF9900',
			'#FF9933',
			'#FFCC00',
			'#FFCC33'
		];

		/**
		 * Currently only WebKit-based Web Inspectors, Firefox >= v31,
		 * and the Firebug extension (any Firefox version) are known
		 * to support "%c" CSS customizations.
		 *
		 * TODO: add a `localStorage` variable to explicitly enable/disable colors
		 */

		// eslint-disable-next-line complexity
		function useColors() {
			// NB: In an Electron preload script, document will be defined but not fully
			// initialized. Since we know we're in Chrome, we'll just detect this case
			// explicitly
			if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {
				return true;
			}

			// Internet Explorer and Edge do not support colors.
			if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
				return false;
			}

			// Is webkit? http://stackoverflow.com/a/16459606/376773
			// document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
			return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
				// Is firebug? http://stackoverflow.com/a/398120/376773
				(typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
				// Is firefox >= v31?
				// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
				(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
				// Double check webkit in userAgent just in case we are in a worker
				(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
		}

		/**
		 * Colorize log arguments if enabled.
		 *
		 * @api public
		 */

		function formatArgs(args) {
			args[0] = (this.useColors ? '%c' : '') +
				this.namespace +
				(this.useColors ? ' %c' : ' ') +
				args[0] +
				(this.useColors ? '%c ' : ' ') +
				'+' + module.exports.humanize(this.diff);

			if (!this.useColors) {
				return;
			}

			const c = 'color: ' + this.color;
			args.splice(1, 0, c, 'color: inherit');

			// The final "%c" is somewhat tricky, because there could be other
			// arguments passed either before or after the %c, so we need to
			// figure out the correct index to insert the CSS into
			let index = 0;
			let lastC = 0;
			args[0].replace(/%[a-zA-Z%]/g, match => {
				if (match === '%%') {
					return;
				}
				index++;
				if (match === '%c') {
					// We only are interested in the *last* %c
					// (the user may have provided their own)
					lastC = index;
				}
			});

			args.splice(lastC, 0, c);
		}

		/**
		 * Invokes `console.debug()` when available.
		 * No-op when `console.debug` is not a "function".
		 * If `console.debug` is not available, falls back
		 * to `console.log`.
		 *
		 * @api public
		 */
		exports.log = console.debug || console.log || (() => {});

		/**
		 * Save `namespaces`.
		 *
		 * @param {String} namespaces
		 * @api private
		 */
		function save(namespaces) {
			try {
				if (namespaces) {
					exports.storage.setItem('debug', namespaces);
				} else {
					exports.storage.removeItem('debug');
				}
			} catch (error) {
				// Swallow
				// XXX (@Qix-) should we be logging these?
			}
		}

		/**
		 * Load `namespaces`.
		 *
		 * @return {String} returns the previously persisted debug modes
		 * @api private
		 */
		function load() {
			let r;
			try {
				r = exports.storage.getItem('debug');
			} catch (error) {
				// Swallow
				// XXX (@Qix-) should we be logging these?
			}

			// If debug isn't set in LS, and we're in Electron, try to load $DEBUG
			if (!r && typeof browser$1$1 !== 'undefined' && 'env' in browser$1$1) {
				r = browser$1$1.env.DEBUG;
			}

			return r;
		}

		/**
		 * Localstorage attempts to return the localstorage.
		 *
		 * This is necessary because safari throws
		 * when a user disables cookies/localstorage
		 * and you attempt to access it.
		 *
		 * @return {LocalStorage}
		 * @api private
		 */

		function localstorage() {
			try {
				// TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
				// The Browser also has localStorage in the global context.
				return localStorage;
			} catch (error) {
				// Swallow
				// XXX (@Qix-) should we be logging these?
			}
		}

		module.exports = requireCommon()(exports);

		const {formatters} = module.exports;

		/**
		 * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
		 */

		formatters.j = function (v) {
			try {
				return JSON.stringify(v);
			} catch (error) {
				return '[UnexpectedJSONParseError]: ' + error.message;
			}
		}; 
	} (browser, browser.exports));
	return browser.exports;
}

var browserExports = requireBrowser();
var getLogger = /*@__PURE__*/getDefaultExportFromCjs(browserExports);

var DAVNamespace;
(function (DAVNamespace) {
    DAVNamespace["CALENDAR_SERVER"] = "http://calendarserver.org/ns/";
    DAVNamespace["CALDAV_APPLE"] = "http://apple.com/ns/ical/";
    DAVNamespace["CALDAV"] = "urn:ietf:params:xml:ns:caldav";
    DAVNamespace["CARDDAV"] = "urn:ietf:params:xml:ns:carddav";
    DAVNamespace["DAV"] = "DAV:";
})(DAVNamespace || (DAVNamespace = {}));
const DAVAttributeMap = {
    [DAVNamespace.CALDAV]: 'xmlns:c',
    [DAVNamespace.CARDDAV]: 'xmlns:card',
    [DAVNamespace.CALENDAR_SERVER]: 'xmlns:cs',
    [DAVNamespace.CALDAV_APPLE]: 'xmlns:ca',
    [DAVNamespace.DAV]: 'xmlns:d',
};
var DAVNamespaceShort;
(function (DAVNamespaceShort) {
    DAVNamespaceShort["CALDAV"] = "c";
    DAVNamespaceShort["CARDDAV"] = "card";
    DAVNamespaceShort["CALENDAR_SERVER"] = "cs";
    DAVNamespaceShort["CALDAV_APPLE"] = "ca";
    DAVNamespaceShort["DAV"] = "d";
})(DAVNamespaceShort || (DAVNamespaceShort = {}));
var ICALObjects;
(function (ICALObjects) {
    ICALObjects["VEVENT"] = "VEVENT";
    ICALObjects["VTODO"] = "VTODO";
    ICALObjects["VJOURNAL"] = "VJOURNAL";
    ICALObjects["VFREEBUSY"] = "VFREEBUSY";
    ICALObjects["VTIMEZONE"] = "VTIMEZONE";
    ICALObjects["VALARM"] = "VALARM";
})(ICALObjects || (ICALObjects = {}));

var lookup = [];
var revLookup = [];
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
var inited = false;
function init () {
  inited = true;
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i];
    revLookup[code.charCodeAt(i)] = i;
  }

  revLookup['-'.charCodeAt(0)] = 62;
  revLookup['_'.charCodeAt(0)] = 63;
}

function toByteArray (b64) {
  if (!inited) {
    init();
  }
  var i, j, l, tmp, placeHolders, arr;
  var len = b64.length;

  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // the number of equal signs (place holders)
  // if there are two placeholders, than the two characters before it
  // represent one byte
  // if there is only one, then the three characters before it represent 2 bytes
  // this is just a cheap hack to not do indexOf twice
  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0;

  // base64 is 4/3 + up to two characters of the original data
  arr = new Arr(len * 3 / 4 - placeHolders);

  // if there are placeholders, only get up to the last complete 4 chars
  l = placeHolders > 0 ? len - 4 : len;

  var L = 0;

  for (i = 0, j = 0; i < l; i += 4, j += 3) {
    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)];
    arr[L++] = (tmp >> 16) & 0xFF;
    arr[L++] = (tmp >> 8) & 0xFF;
    arr[L++] = tmp & 0xFF;
  }

  if (placeHolders === 2) {
    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
    arr[L++] = tmp & 0xFF;
  } else if (placeHolders === 1) {
    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2);
    arr[L++] = (tmp >> 8) & 0xFF;
    arr[L++] = tmp & 0xFF;
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp;
  var output = [];
  for (var i = start; i < end; i += 3) {
    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]);
    output.push(tripletToBase64(tmp));
  }
  return output.join('')
}

function fromByteArray (uint8) {
  if (!inited) {
    init();
  }
  var tmp;
  var len = uint8.length;
  var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
  var output = '';
  var parts = [];
  var maxChunkLength = 16383; // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1];
    output += lookup[tmp >> 2];
    output += lookup[(tmp << 4) & 0x3F];
    output += '==';
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + (uint8[len - 1]);
    output += lookup[tmp >> 10];
    output += lookup[(tmp >> 4) & 0x3F];
    output += lookup[(tmp << 2) & 0x3F];
    output += '=';
  }

  parts.push(output);

  return parts.join('')
}

function read (buffer, offset, isLE, mLen, nBytes) {
  var e, m;
  var eLen = nBytes * 8 - mLen - 1;
  var eMax = (1 << eLen) - 1;
  var eBias = eMax >> 1;
  var nBits = -7;
  var i = isLE ? (nBytes - 1) : 0;
  var d = isLE ? -1 : 1;
  var s = buffer[offset + i];

  i += d;

  e = s & ((1 << (-nBits)) - 1);
  s >>= (-nBits);
  nBits += eLen;
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1);
  e >>= (-nBits);
  nBits += mLen;
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias;
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen);
    e = e - eBias;
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

function write (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c;
  var eLen = nBytes * 8 - mLen - 1;
  var eMax = (1 << eLen) - 1;
  var eBias = eMax >> 1;
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0);
  var i = isLE ? 0 : (nBytes - 1);
  var d = isLE ? 1 : -1;
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;

  value = Math.abs(value);

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0;
    e = eMax;
  } else {
    e = Math.floor(Math.log(value) / Math.LN2);
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--;
      c *= 2;
    }
    if (e + eBias >= 1) {
      value += rt / c;
    } else {
      value += rt * Math.pow(2, 1 - eBias);
    }
    if (value * c >= 2) {
      e++;
      c /= 2;
    }

    if (e + eBias >= eMax) {
      m = 0;
      e = eMax;
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen);
      e = e + eBias;
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
      e = 0;
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m;
  eLen += mLen;
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128;
}

var toString = {}.toString;

var isArray$1 = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */


var INSPECT_MAX_BYTES = 50;

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * Due to various browser bugs, sometimes the Object implementation will be used even
 * when the browser supports typed arrays.
 *
 * Note:
 *
 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 *
 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 *
 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
 *     incorrect length in some situations.

 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
 * get the Object implementation, which is slower but behaves correctly.
 */
Buffer.TYPED_ARRAY_SUPPORT = global$1.TYPED_ARRAY_SUPPORT !== undefined
  ? global$1.TYPED_ARRAY_SUPPORT
  : true;

/*
 * Export kMaxLength after typed array support is determined.
 */
kMaxLength();

function kMaxLength () {
  return Buffer.TYPED_ARRAY_SUPPORT
    ? 0x7fffffff
    : 0x3fffffff
}

function createBuffer (that, length) {
  if (kMaxLength() < length) {
    throw new RangeError('Invalid typed array length')
  }
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = new Uint8Array(length);
    that.__proto__ = Buffer.prototype;
  } else {
    // Fallback: Return an object instance of the Buffer class
    if (that === null) {
      that = new Buffer(length);
    }
    that.length = length;
  }

  return that
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
    return new Buffer(arg, encodingOrOffset, length)
  }

  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new Error(
        'If encoding is specified then the first argument must be a string'
      )
    }
    return allocUnsafe(this, arg)
  }
  return from(this, arg, encodingOrOffset, length)
}

Buffer.poolSize = 8192; // not used by this implementation

// TODO: Legacy, not needed anymore. Remove in next major version.
Buffer._augment = function (arr) {
  arr.__proto__ = Buffer.prototype;
  return arr
};

function from (that, value, encodingOrOffset, length) {
  if (typeof value === 'number') {
    throw new TypeError('"value" argument must not be a number')
  }

  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
    return fromArrayBuffer(that, value, encodingOrOffset, length)
  }

  if (typeof value === 'string') {
    return fromString(that, value, encodingOrOffset)
  }

  return fromObject(that, value)
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(null, value, encodingOrOffset, length)
};

if (Buffer.TYPED_ARRAY_SUPPORT) {
  Buffer.prototype.__proto__ = Uint8Array.prototype;
  Buffer.__proto__ = Uint8Array;
  if (typeof Symbol !== 'undefined' && Symbol.species &&
      Buffer[Symbol.species] === Buffer) ;
}

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be a number')
  } else if (size < 0) {
    throw new RangeError('"size" argument must not be negative')
  }
}

function alloc (that, size, fill, encoding) {
  assertSize(size);
  if (size <= 0) {
    return createBuffer(that, size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(that, size).fill(fill, encoding)
      : createBuffer(that, size).fill(fill)
  }
  return createBuffer(that, size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(null, size, fill, encoding)
};

function allocUnsafe (that, size) {
  assertSize(size);
  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0);
  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    for (var i = 0; i < size; ++i) {
      that[i] = 0;
    }
  }
  return that
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(null, size)
};
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(null, size)
};

function fromString (that, string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8';
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('"encoding" must be a valid string encoding')
  }

  var length = byteLength(string, encoding) | 0;
  that = createBuffer(that, length);

  var actual = that.write(string, encoding);

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    that = that.slice(0, actual);
  }

  return that
}

function fromArrayLike (that, array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0;
  that = createBuffer(that, length);
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255;
  }
  return that
}

function fromArrayBuffer (that, array, byteOffset, length) {
  array.byteLength; // this throws if `array` is not a valid ArrayBuffer

  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('\'offset\' is out of bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('\'length\' is out of bounds')
  }

  if (byteOffset === undefined && length === undefined) {
    array = new Uint8Array(array);
  } else if (length === undefined) {
    array = new Uint8Array(array, byteOffset);
  } else {
    array = new Uint8Array(array, byteOffset, length);
  }

  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = array;
    that.__proto__ = Buffer.prototype;
  } else {
    // Fallback: Return an object instance of the Buffer class
    that = fromArrayLike(that, array);
  }
  return that
}

function fromObject (that, obj) {
  if (internalIsBuffer(obj)) {
    var len = checked(obj.length) | 0;
    that = createBuffer(that, len);

    if (that.length === 0) {
      return that
    }

    obj.copy(that, 0, 0, len);
    return that
  }

  if (obj) {
    if ((typeof ArrayBuffer !== 'undefined' &&
        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
      if (typeof obj.length !== 'number' || isnan(obj.length)) {
        return createBuffer(that, 0)
      }
      return fromArrayLike(that, obj)
    }

    if (obj.type === 'Buffer' && isArray$1(obj.data)) {
      return fromArrayLike(that, obj.data)
    }
  }

  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
}

function checked (length) {
  // Note: cannot use `length < kMaxLength()` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= kMaxLength()) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
  }
  return length | 0
}
Buffer.isBuffer = isBuffer;
function internalIsBuffer (b) {
  return !!(b != null && b._isBuffer)
}

Buffer.compare = function compare (a, b) {
  if (!internalIsBuffer(a) || !internalIsBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length;
  var y = b.length;

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i];
      y = b[i];
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
};

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
};

Buffer.concat = function concat (list, length) {
  if (!isArray$1(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i;
  if (length === undefined) {
    length = 0;
    for (i = 0; i < list.length; ++i) {
      length += list[i].length;
    }
  }

  var buffer = Buffer.allocUnsafe(length);
  var pos = 0;
  for (i = 0; i < list.length; ++i) {
    var buf = list[i];
    if (!internalIsBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos);
    pos += buf.length;
  }
  return buffer
};

function byteLength (string, encoding) {
  if (internalIsBuffer(string)) {
    return string.length
  }
  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    string = '' + string;
  }

  var len = string.length;
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false;
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
      case undefined:
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase();
        loweredCase = true;
    }
  }
}
Buffer.byteLength = byteLength;

function slowToString (encoding, start, end) {
  var loweredCase = false;

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0;
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length;
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0;
  start >>>= 0;

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8';

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase();
        loweredCase = true;
    }
  }
}

// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
// Buffer instances.
Buffer.prototype._isBuffer = true;

function swap (b, n, m) {
  var i = b[n];
  b[n] = b[m];
  b[m] = i;
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length;
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1);
  }
  return this
};

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length;
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3);
    swap(this, i + 1, i + 2);
  }
  return this
};

Buffer.prototype.swap64 = function swap64 () {
  var len = this.length;
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap(this, i, i + 7);
    swap(this, i + 1, i + 6);
    swap(this, i + 2, i + 5);
    swap(this, i + 3, i + 4);
  }
  return this
};

Buffer.prototype.toString = function toString () {
  var length = this.length | 0;
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
};

Buffer.prototype.equals = function equals (b) {
  if (!internalIsBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
};

Buffer.prototype.inspect = function inspect () {
  var str = '';
  var max = INSPECT_MAX_BYTES;
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ');
    if (this.length > max) str += ' ... ';
  }
  return '<Buffer ' + str + '>'
};

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (!internalIsBuffer(target)) {
    throw new TypeError('Argument must be a Buffer')
  }

  if (start === undefined) {
    start = 0;
  }
  if (end === undefined) {
    end = target ? target.length : 0;
  }
  if (thisStart === undefined) {
    thisStart = 0;
  }
  if (thisEnd === undefined) {
    thisEnd = this.length;
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0;
  end >>>= 0;
  thisStart >>>= 0;
  thisEnd >>>= 0;

  if (this === target) return 0

  var x = thisEnd - thisStart;
  var y = end - start;
  var len = Math.min(x, y);

  var thisCopy = this.slice(thisStart, thisEnd);
  var targetCopy = target.slice(start, end);

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i];
      y = targetCopy[i];
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
};

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset;
    byteOffset = 0;
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff;
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000;
  }
  byteOffset = +byteOffset;  // Coerce to Number.
  if (isNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1);
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset;
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1;
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0;
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer.from(val, encoding);
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (internalIsBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF; // Search for a byte value [0-255]
    if (Buffer.TYPED_ARRAY_SUPPORT &&
        typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1;
  var arrLength = arr.length;
  var valLength = val.length;

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase();
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2;
      arrLength /= 2;
      valLength /= 2;
      byteOffset /= 2;
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i;
  if (dir) {
    var foundIndex = -1;
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i;
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex;
        foundIndex = -1;
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength;
    for (i = byteOffset; i >= 0; i--) {
      var found = true;
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false;
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
};

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
};

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
};

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0;
  var remaining = buf.length - offset;
  if (!length) {
    length = remaining;
  } else {
    length = Number(length);
    if (length > remaining) {
      length = remaining;
    }
  }

  // must be an even number of digits
  var strLen = string.length;
  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2;
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16);
    if (isNaN(parsed)) return i
    buf[offset + i] = parsed;
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8';
    length = this.length;
    offset = 0;
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset;
    length = this.length;
    offset = 0;
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset | 0;
    if (isFinite(length)) {
      length = length | 0;
      if (encoding === undefined) encoding = 'utf8';
    } else {
      encoding = length;
      length = undefined;
    }
  // legacy write(string, encoding, offset, length) - remove in v0.13
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset;
  if (length === undefined || length > remaining) length = remaining;

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8';

  var loweredCase = false;
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'latin1':
      case 'binary':
        return latin1Write(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase();
        loweredCase = true;
    }
  }
};

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
};

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return fromByteArray(buf)
  } else {
    return fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end);
  var res = [];

  var i = start;
  while (i < end) {
    var firstByte = buf[i];
    var codePoint = null;
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1;

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint;

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte;
          }
          break
        case 2:
          secondByte = buf[i + 1];
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F);
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint;
            }
          }
          break
        case 3:
          secondByte = buf[i + 1];
          thirdByte = buf[i + 2];
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F);
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint;
            }
          }
          break
        case 4:
          secondByte = buf[i + 1];
          thirdByte = buf[i + 2];
          fourthByte = buf[i + 3];
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F);
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint;
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD;
      bytesPerSequence = 1;
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000;
      res.push(codePoint >>> 10 & 0x3FF | 0xD800);
      codePoint = 0xDC00 | codePoint & 0x3FF;
    }

    res.push(codePoint);
    i += bytesPerSequence;
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000;

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length;
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = '';
  var i = 0;
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    );
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = '';
  end = Math.min(buf.length, end);

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F);
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = '';
  end = Math.min(buf.length, end);

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i]);
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length;

  if (!start || start < 0) start = 0;
  if (!end || end < 0 || end > len) end = len;

  var out = '';
  for (var i = start; i < end; ++i) {
    out += toHex(buf[i]);
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end);
  var res = '';
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256);
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length;
  start = ~~start;
  end = end === undefined ? len : ~~end;

  if (start < 0) {
    start += len;
    if (start < 0) start = 0;
  } else if (start > len) {
    start = len;
  }

  if (end < 0) {
    end += len;
    if (end < 0) end = 0;
  } else if (end > len) {
    end = len;
  }

  if (end < start) end = start;

  var newBuf;
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    newBuf = this.subarray(start, end);
    newBuf.__proto__ = Buffer.prototype;
  } else {
    var sliceLen = end - start;
    newBuf = new Buffer(sliceLen, undefined);
    for (var i = 0; i < sliceLen; ++i) {
      newBuf[i] = this[i + start];
    }
  }

  return newBuf
};

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var val = this[offset];
  var mul = 1;
  var i = 0;
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul;
  }

  return val
};

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length);
  }

  var val = this[offset + --byteLength];
  var mul = 1;
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul;
  }

  return val
};

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length);
  return this[offset]
};

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  return this[offset] | (this[offset + 1] << 8)
};

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  return (this[offset] << 8) | this[offset + 1]
};

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
};

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
};

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var val = this[offset];
  var mul = 1;
  var i = 0;
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul;
  }
  mul *= 0x80;

  if (val >= mul) val -= Math.pow(2, 8 * byteLength);

  return val
};

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) checkOffset(offset, byteLength, this.length);

  var i = byteLength;
  var mul = 1;
  var val = this[offset + --i];
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul;
  }
  mul *= 0x80;

  if (val >= mul) val -= Math.pow(2, 8 * byteLength);

  return val
};

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length);
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
};

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  var val = this[offset] | (this[offset + 1] << 8);
  return (val & 0x8000) ? val | 0xFFFF0000 : val
};

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length);
  var val = this[offset + 1] | (this[offset] << 8);
  return (val & 0x8000) ? val | 0xFFFF0000 : val
};

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
};

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
};

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);
  return read(this, offset, true, 23, 4)
};

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length);
  return read(this, offset, false, 23, 4)
};

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length);
  return read(this, offset, true, 52, 8)
};

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length);
  return read(this, offset, false, 52, 8)
};

function checkInt (buf, value, offset, ext, max, min) {
  if (!internalIsBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1;
    checkInt(this, value, offset, byteLength, maxBytes, 0);
  }

  var mul = 1;
  var i = 0;
  this[offset] = value & 0xFF;
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF;
  }

  return offset + byteLength
};

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  byteLength = byteLength | 0;
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1;
    checkInt(this, value, offset, byteLength, maxBytes, 0);
  }

  var i = byteLength - 1;
  var mul = 1;
  this[offset + i] = value & 0xFF;
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF;
  }

  return offset + byteLength
};

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0);
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
  this[offset] = (value & 0xff);
  return offset + 1
};

function objectWriteUInt16 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffff + value + 1;
  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
      (littleEndian ? i : 1 - i) * 8;
  }
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
  } else {
    objectWriteUInt16(this, value, offset, true);
  }
  return offset + 2
};

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8);
    this[offset + 1] = (value & 0xff);
  } else {
    objectWriteUInt16(this, value, offset, false);
  }
  return offset + 2
};

function objectWriteUInt32 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffffffff + value + 1;
  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff;
  }
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset + 3] = (value >>> 24);
    this[offset + 2] = (value >>> 16);
    this[offset + 1] = (value >>> 8);
    this[offset] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, true);
  }
  return offset + 4
};

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24);
    this[offset + 1] = (value >>> 16);
    this[offset + 2] = (value >>> 8);
    this[offset + 3] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, false);
  }
  return offset + 4
};

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1);

    checkInt(this, value, offset, byteLength, limit - 1, -limit);
  }

  var i = 0;
  var mul = 1;
  var sub = 0;
  this[offset] = value & 0xFF;
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1;
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
  }

  return offset + byteLength
};

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1);

    checkInt(this, value, offset, byteLength, limit - 1, -limit);
  }

  var i = byteLength - 1;
  var mul = 1;
  var sub = 0;
  this[offset + i] = value & 0xFF;
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1;
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
  }

  return offset + byteLength
};

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80);
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
  if (value < 0) value = 0xff + value + 1;
  this[offset] = (value & 0xff);
  return offset + 1
};

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
  } else {
    objectWriteUInt16(this, value, offset, true);
  }
  return offset + 2
};

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8);
    this[offset + 1] = (value & 0xff);
  } else {
    objectWriteUInt16(this, value, offset, false);
  }
  return offset + 2
};

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff);
    this[offset + 1] = (value >>> 8);
    this[offset + 2] = (value >>> 16);
    this[offset + 3] = (value >>> 24);
  } else {
    objectWriteUInt32(this, value, offset, true);
  }
  return offset + 4
};

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value;
  offset = offset | 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  if (value < 0) value = 0xffffffff + value + 1;
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24);
    this[offset + 1] = (value >>> 16);
    this[offset + 2] = (value >>> 8);
    this[offset + 3] = (value & 0xff);
  } else {
    objectWriteUInt32(this, value, offset, false);
  }
  return offset + 4
};

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4);
  }
  write(buf, value, offset, littleEndian, 23, 4);
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
};

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
};

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8);
  }
  write(buf, value, offset, littleEndian, 52, 8);
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
};

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
};

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0;
  if (!end && end !== 0) end = this.length;
  if (targetStart >= target.length) targetStart = target.length;
  if (!targetStart) targetStart = 0;
  if (end > 0 && end < start) end = start;

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length;
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start;
  }

  var len = end - start;
  var i;

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; --i) {
      target[i + targetStart] = this[i + start];
    }
  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
    // ascending copy from start
    for (i = 0; i < len; ++i) {
      target[i + targetStart] = this[i + start];
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, start + len),
      targetStart
    );
  }

  return len
};

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start;
      start = 0;
      end = this.length;
    } else if (typeof end === 'string') {
      encoding = end;
      end = this.length;
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0);
      if (code < 256) {
        val = code;
      }
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
  } else if (typeof val === 'number') {
    val = val & 255;
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0;
  end = end === undefined ? this.length : end >>> 0;

  if (!val) val = 0;

  var i;
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val;
    }
  } else {
    var bytes = internalIsBuffer(val)
      ? val
      : utf8ToBytes(new Buffer(val, encoding).toString());
    var len = bytes.length;
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len];
    }
  }

  return this
};

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g;

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = stringtrim(str).replace(INVALID_BASE64_RE, '');
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '=';
  }
  return str
}

function stringtrim (str) {
  if (str.trim) return str.trim()
  return str.replace(/^\s+|\s+$/g, '')
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity;
  var codePoint;
  var length = string.length;
  var leadSurrogate = null;
  var bytes = [];

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i);

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
          continue
        }

        // valid lead
        leadSurrogate = codePoint;

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
        leadSurrogate = codePoint;
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000;
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
    }

    leadSurrogate = null;

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint);
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      );
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      );
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      );
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = [];
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF);
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo;
  var byteArray = [];
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i);
    hi = c >> 8;
    lo = c % 256;
    byteArray.push(lo);
    byteArray.push(hi);
  }

  return byteArray
}


function base64ToBytes (str) {
  return toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i];
  }
  return i
}

function isnan (val) {
  return val !== val // eslint-disable-line no-self-compare
}


// the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence
// The _isBuffer check is for Safari 5-7 support, because it's missing
// Object.prototype.constructor. Remove this eventually
function isBuffer(obj) {
  return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj))
}

function isFastBuffer (obj) {
  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
}

// For Node v0.10 support. Remove this eventually.
function isSlowBuffer (obj) {
  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer(obj.slice(0, 0))
}

var sax = {};

var domain;

// This constructor is used to store event handlers. Instantiating this is
// faster than explicitly calling `Object.create(null)` to get a "clean" empty
// object (tested with v8 v4.9).
function EventHandlers() {}
EventHandlers.prototype = Object.create(null);

function EventEmitter() {
  EventEmitter.init.call(this);
}

// nodejs oddity
// require('events') === require('events').EventEmitter
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.usingDomains = false;

EventEmitter.prototype.domain = undefined;
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

EventEmitter.init = function() {
  this.domain = null;
  if (EventEmitter.usingDomains) {
    // if there is an active domain, then attach to it.
    if (domain.active) ;
  }

  if (!this._events || this._events === Object.getPrototypeOf(this)._events) {
    this._events = new EventHandlers();
    this._eventsCount = 0;
  }

  this._maxListeners = this._maxListeners || undefined;
};

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
  if (typeof n !== 'number' || n < 0 || isNaN(n))
    throw new TypeError('"n" argument must be a positive number');
  this._maxListeners = n;
  return this;
};

function $getMaxListeners(that) {
  if (that._maxListeners === undefined)
    return EventEmitter.defaultMaxListeners;
  return that._maxListeners;
}

EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
  return $getMaxListeners(this);
};

// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
  if (isFn)
    handler.call(self);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self);
  }
}
function emitOne(handler, isFn, self, arg1) {
  if (isFn)
    handler.call(self, arg1);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1);
  }
}
function emitTwo(handler, isFn, self, arg1, arg2) {
  if (isFn)
    handler.call(self, arg1, arg2);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2);
  }
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
  if (isFn)
    handler.call(self, arg1, arg2, arg3);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2, arg3);
  }
}

function emitMany(handler, isFn, self, args) {
  if (isFn)
    handler.apply(self, args);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].apply(self, args);
  }
}

EventEmitter.prototype.emit = function emit(type) {
  var er, handler, len, args, i, events, domain;
  var doError = (type === 'error');

  events = this._events;
  if (events)
    doError = (doError && events.error == null);
  else if (!doError)
    return false;

  domain = this.domain;

  // If there is no 'error' event listener then throw.
  if (doError) {
    er = arguments[1];
    if (domain) {
      if (!er)
        er = new Error('Uncaught, unspecified "error" event');
      er.domainEmitter = this;
      er.domain = domain;
      er.domainThrown = false;
      domain.emit('error', er);
    } else if (er instanceof Error) {
      throw er; // Unhandled 'error' event
    } else {
      // At least give some kind of context to the user
      var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
      err.context = er;
      throw err;
    }
    return false;
  }

  handler = events[type];

  if (!handler)
    return false;

  var isFn = typeof handler === 'function';
  len = arguments.length;
  switch (len) {
    // fast cases
    case 1:
      emitNone(handler, isFn, this);
      break;
    case 2:
      emitOne(handler, isFn, this, arguments[1]);
      break;
    case 3:
      emitTwo(handler, isFn, this, arguments[1], arguments[2]);
      break;
    case 4:
      emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
      break;
    // slower
    default:
      args = new Array(len - 1);
      for (i = 1; i < len; i++)
        args[i - 1] = arguments[i];
      emitMany(handler, isFn, this, args);
  }

  return true;
};

function _addListener(target, type, listener, prepend) {
  var m;
  var events;
  var existing;

  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');

  events = target._events;
  if (!events) {
    events = target._events = new EventHandlers();
    target._eventsCount = 0;
  } else {
    // To avoid recursion in the case that type === "newListener"! Before
    // adding it to the listeners, first emit "newListener".
    if (events.newListener) {
      target.emit('newListener', type,
                  listener.listener ? listener.listener : listener);

      // Re-assign `events` because a newListener handler could have caused the
      // this._events to be assigned to a new object
      events = target._events;
    }
    existing = events[type];
  }

  if (!existing) {
    // Optimize the case of one listener. Don't need the extra array object.
    existing = events[type] = listener;
    ++target._eventsCount;
  } else {
    if (typeof existing === 'function') {
      // Adding the second element, need to change to array.
      existing = events[type] = prepend ? [listener, existing] :
                                          [existing, listener];
    } else {
      // If we've already got an array, just append.
      if (prepend) {
        existing.unshift(listener);
      } else {
        existing.push(listener);
      }
    }

    // Check for listener leak
    if (!existing.warned) {
      m = $getMaxListeners(target);
      if (m && m > 0 && existing.length > m) {
        existing.warned = true;
        var w = new Error('Possible EventEmitter memory leak detected. ' +
                            existing.length + ' ' + type + ' listeners added. ' +
                            'Use emitter.setMaxListeners() to increase limit');
        w.name = 'MaxListenersExceededWarning';
        w.emitter = target;
        w.type = type;
        w.count = existing.length;
        emitWarning(w);
      }
    }
  }

  return target;
}
function emitWarning(e) {
  typeof console.warn === 'function' ? console.warn(e) : console.log(e);
}
EventEmitter.prototype.addListener = function addListener(type, listener) {
  return _addListener(this, type, listener, false);
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.prependListener =
    function prependListener(type, listener) {
      return _addListener(this, type, listener, true);
    };

function _onceWrap(target, type, listener) {
  var fired = false;
  function g() {
    target.removeListener(type, g);
    if (!fired) {
      fired = true;
      listener.apply(target, arguments);
    }
  }
  g.listener = listener;
  return g;
}

EventEmitter.prototype.once = function once(type, listener) {
  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');
  this.on(type, _onceWrap(this, type, listener));
  return this;
};

EventEmitter.prototype.prependOnceListener =
    function prependOnceListener(type, listener) {
      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');
      this.prependListener(type, _onceWrap(this, type, listener));
      return this;
    };

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener =
    function removeListener(type, listener) {
      var list, events, position, i, originalListener;

      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');

      events = this._events;
      if (!events)
        return this;

      list = events[type];
      if (!list)
        return this;

      if (list === listener || (list.listener && list.listener === listener)) {
        if (--this._eventsCount === 0)
          this._events = new EventHandlers();
        else {
          delete events[type];
          if (events.removeListener)
            this.emit('removeListener', type, list.listener || listener);
        }
      } else if (typeof list !== 'function') {
        position = -1;

        for (i = list.length; i-- > 0;) {
          if (list[i] === listener ||
              (list[i].listener && list[i].listener === listener)) {
            originalListener = list[i].listener;
            position = i;
            break;
          }
        }

        if (position < 0)
          return this;

        if (list.length === 1) {
          list[0] = undefined;
          if (--this._eventsCount === 0) {
            this._events = new EventHandlers();
            return this;
          } else {
            delete events[type];
          }
        } else {
          spliceOne(list, position);
        }

        if (events.removeListener)
          this.emit('removeListener', type, originalListener || listener);
      }

      return this;
    };
    
// Alias for removeListener added in NodeJS 10.0
// https://nodejs.org/api/events.html#events_emitter_off_eventname_listener
EventEmitter.prototype.off = function(type, listener){
    return this.removeListener(type, listener);
};

EventEmitter.prototype.removeAllListeners =
    function removeAllListeners(type) {
      var listeners, events;

      events = this._events;
      if (!events)
        return this;

      // not listening for removeListener, no need to emit
      if (!events.removeListener) {
        if (arguments.length === 0) {
          this._events = new EventHandlers();
          this._eventsCount = 0;
        } else if (events[type]) {
          if (--this._eventsCount === 0)
            this._events = new EventHandlers();
          else
            delete events[type];
        }
        return this;
      }

      // emit removeListener for all listeners on all events
      if (arguments.length === 0) {
        var keys = Object.keys(events);
        for (var i = 0, key; i < keys.length; ++i) {
          key = keys[i];
          if (key === 'removeListener') continue;
          this.removeAllListeners(key);
        }
        this.removeAllListeners('removeListener');
        this._events = new EventHandlers();
        this._eventsCount = 0;
        return this;
      }

      listeners = events[type];

      if (typeof listeners === 'function') {
        this.removeListener(type, listeners);
      } else if (listeners) {
        // LIFO order
        do {
          this.removeListener(type, listeners[listeners.length - 1]);
        } while (listeners[0]);
      }

      return this;
    };

EventEmitter.prototype.listeners = function listeners(type) {
  var evlistener;
  var ret;
  var events = this._events;

  if (!events)
    ret = [];
  else {
    evlistener = events[type];
    if (!evlistener)
      ret = [];
    else if (typeof evlistener === 'function')
      ret = [evlistener.listener || evlistener];
    else
      ret = unwrapListeners(evlistener);
  }

  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  if (typeof emitter.listenerCount === 'function') {
    return emitter.listenerCount(type);
  } else {
    return listenerCount$1.call(emitter, type);
  }
};

EventEmitter.prototype.listenerCount = listenerCount$1;
function listenerCount$1(type) {
  var events = this._events;

  if (events) {
    var evlistener = events[type];

    if (typeof evlistener === 'function') {
      return 1;
    } else if (evlistener) {
      return evlistener.length;
    }
  }

  return 0;
}

EventEmitter.prototype.eventNames = function eventNames() {
  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
};

// About 1.5x faster than the two-arg version of Array#splice().
function spliceOne(list, index) {
  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
    list[i] = list[k];
  list.pop();
}

function arrayClone(arr, i) {
  var copy = new Array(i);
  while (i--)
    copy[i] = arr[i];
  return copy;
}

function unwrapListeners(arr) {
  var ret = new Array(arr.length);
  for (var i = 0; i < ret.length; ++i) {
    ret[i] = arr[i].listener || arr[i];
  }
  return ret;
}

var inherits;
if (typeof Object.create === 'function'){
  inherits = function inherits(ctor, superCtor) {
    // implementation from standard node.js 'util' module
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  inherits = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor;
    var TempCtor = function () {};
    TempCtor.prototype = superCtor.prototype;
    ctor.prototype = new TempCtor();
    ctor.prototype.constructor = ctor;
  };
}

var formatRegExp = /%[sdj%]/g;
function format(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
}

// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
function deprecate(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global$1.process)) {
    return function() {
      return deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (browser$1$1.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (browser$1$1.throwDeprecation) {
        throw new Error(msg);
      } else if (browser$1$1.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

var debugs = {};
var debugEnviron;
function debuglog(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = browser$1$1.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = 0;
      debugs[set] = function() {
        var msg = format.apply(null, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
}

/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    _extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}

// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var length = output.reduce(function(prev, cur) {
    if (cur.indexOf('\n') >= 0) ;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}

function isBoolean(arg) {
  return typeof arg === 'boolean';
}

function isNull(arg) {
  return arg === null;
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isString(arg) {
  return typeof arg === 'string';
}

function isUndefined(arg) {
  return arg === void 0;
}

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}

function isFunction(arg) {
  return typeof arg === 'function';
}

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

function _extend(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
}
function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

function BufferList() {
  this.head = null;
  this.tail = null;
  this.length = 0;
}

BufferList.prototype.push = function (v) {
  var entry = { data: v, next: null };
  if (this.length > 0) this.tail.next = entry;else this.head = entry;
  this.tail = entry;
  ++this.length;
};

BufferList.prototype.unshift = function (v) {
  var entry = { data: v, next: this.head };
  if (this.length === 0) this.tail = entry;
  this.head = entry;
  ++this.length;
};

BufferList.prototype.shift = function () {
  if (this.length === 0) return;
  var ret = this.head.data;
  if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
  --this.length;
  return ret;
};

BufferList.prototype.clear = function () {
  this.head = this.tail = null;
  this.length = 0;
};

BufferList.prototype.join = function (s) {
  if (this.length === 0) return '';
  var p = this.head;
  var ret = '' + p.data;
  while (p = p.next) {
    ret += s + p.data;
  }return ret;
};

BufferList.prototype.concat = function (n) {
  if (this.length === 0) return Buffer.alloc(0);
  if (this.length === 1) return this.head.data;
  var ret = Buffer.allocUnsafe(n >>> 0);
  var p = this.head;
  var i = 0;
  while (p) {
    p.data.copy(ret, i);
    i += p.data.length;
    p = p.next;
  }
  return ret;
};

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var isBufferEncoding = Buffer.isEncoding
  || function(encoding) {
       switch (encoding && encoding.toLowerCase()) {
         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
         default: return false;
       }
     };


function assertEncoding(encoding) {
  if (encoding && !isBufferEncoding(encoding)) {
    throw new Error('Unknown encoding: ' + encoding);
  }
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters. CESU-8 is handled as part of the UTF-8 encoding.
//
// @TODO Handling all encodings inside a single object makes it very difficult
// to reason about this code, so it should be split up in the future.
// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
// points as used by CESU-8.
function StringDecoder(encoding) {
  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
  assertEncoding(encoding);
  switch (this.encoding) {
    case 'utf8':
      // CESU-8 represents each of Surrogate Pair by 3-bytes
      this.surrogateSize = 3;
      break;
    case 'ucs2':
    case 'utf16le':
      // UTF-16 represents each of Surrogate Pair by 2-bytes
      this.surrogateSize = 2;
      this.detectIncompleteChar = utf16DetectIncompleteChar;
      break;
    case 'base64':
      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
      this.surrogateSize = 3;
      this.detectIncompleteChar = base64DetectIncompleteChar;
      break;
    default:
      this.write = passThroughWrite;
      return;
  }

  // Enough space to store all bytes of a single character. UTF-8 needs 4
  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
  this.charBuffer = new Buffer(6);
  // Number of bytes received for the current incomplete multi-byte character.
  this.charReceived = 0;
  // Number of bytes expected for the current incomplete multi-byte character.
  this.charLength = 0;
}

// write decodes the given buffer and returns it as JS string that is
// guaranteed to not contain any partial multi-byte characters. Any partial
// character found at the end of the buffer is buffered up, and will be
// returned when calling write again with the remaining bytes.
//
// Note: Converting a Buffer containing an orphan surrogate to a String
// currently works, but converting a String to a Buffer (via `new Buffer`, or
// Buffer#write) will replace incomplete surrogates with the unicode
// replacement character. See https://codereview.chromium.org/121173009/ .
StringDecoder.prototype.write = function(buffer) {
  var charStr = '';
  // if our last write ended with an incomplete multibyte character
  while (this.charLength) {
    // determine how many remaining bytes this buffer has to offer for this char
    var available = (buffer.length >= this.charLength - this.charReceived) ?
        this.charLength - this.charReceived :
        buffer.length;

    // add the new bytes to the char buffer
    buffer.copy(this.charBuffer, this.charReceived, 0, available);
    this.charReceived += available;

    if (this.charReceived < this.charLength) {
      // still not enough chars in this buffer? wait for more ...
      return '';
    }

    // remove bytes belonging to the current character from the buffer
    buffer = buffer.slice(available, buffer.length);

    // get the character that was split
    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);

    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
    var charCode = charStr.charCodeAt(charStr.length - 1);
    if (charCode >= 0xD800 && charCode <= 0xDBFF) {
      this.charLength += this.surrogateSize;
      charStr = '';
      continue;
    }
    this.charReceived = this.charLength = 0;

    // if there are no more bytes in this buffer, just emit our char
    if (buffer.length === 0) {
      return charStr;
    }
    break;
  }

  // determine and set charLength / charReceived
  this.detectIncompleteChar(buffer);

  var end = buffer.length;
  if (this.charLength) {
    // buffer the incomplete character bytes we got
    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
    end -= this.charReceived;
  }

  charStr += buffer.toString(this.encoding, 0, end);

  var end = charStr.length - 1;
  var charCode = charStr.charCodeAt(end);
  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
  if (charCode >= 0xD800 && charCode <= 0xDBFF) {
    var size = this.surrogateSize;
    this.charLength += size;
    this.charReceived += size;
    this.charBuffer.copy(this.charBuffer, size, 0, size);
    buffer.copy(this.charBuffer, 0, 0, size);
    return charStr.substring(0, end);
  }

  // or just emit the charStr
  return charStr;
};

// detectIncompleteChar determines if there is an incomplete UTF-8 character at
// the end of the given buffer. If so, it sets this.charLength to the byte
// length that character, and sets this.charReceived to the number of bytes
// that are available for this character.
StringDecoder.prototype.detectIncompleteChar = function(buffer) {
  // determine how many bytes we have to check at the end of this buffer
  var i = (buffer.length >= 3) ? 3 : buffer.length;

  // Figure out if one of the last i bytes of our buffer announces an
  // incomplete char.
  for (; i > 0; i--) {
    var c = buffer[buffer.length - i];

    // See http://en.wikipedia.org/wiki/UTF-8#Description

    // 110XXXXX
    if (i == 1 && c >> 5 == 0x06) {
      this.charLength = 2;
      break;
    }

    // 1110XXXX
    if (i <= 2 && c >> 4 == 0x0E) {
      this.charLength = 3;
      break;
    }

    // 11110XXX
    if (i <= 3 && c >> 3 == 0x1E) {
      this.charLength = 4;
      break;
    }
  }
  this.charReceived = i;
};

StringDecoder.prototype.end = function(buffer) {
  var res = '';
  if (buffer && buffer.length)
    res = this.write(buffer);

  if (this.charReceived) {
    var cr = this.charReceived;
    var buf = this.charBuffer;
    var enc = this.encoding;
    res += buf.slice(0, cr).toString(enc);
  }

  return res;
};

function passThroughWrite(buffer) {
  return buffer.toString(this.encoding);
}

function utf16DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 2;
  this.charLength = this.charReceived ? 2 : 0;
}

function base64DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 3;
  this.charLength = this.charReceived ? 3 : 0;
}

var _polyfillNode_string_decoder = /*#__PURE__*/Object.freeze({
	__proto__: null,
	StringDecoder: StringDecoder
});

Readable.ReadableState = ReadableState;

var debug$6 = debuglog('stream');
inherits(Readable, EventEmitter);

function prependListener(emitter, event, fn) {
  // Sadly this is not cacheable as some libraries bundle their own
  // event emitter implementation with them.
  if (typeof emitter.prependListener === 'function') {
    return emitter.prependListener(event, fn);
  } else {
    // This is a hack to make sure that our error handler is attached before any
    // userland ones.  NEVER DO THIS. This is here only because this code needs
    // to continue to work with older versions of Node.js that do not include
    // the prependListener() method. The goal is to eventually remove this hack.
    if (!emitter._events || !emitter._events[event])
      emitter.on(event, fn);
    else if (Array.isArray(emitter._events[event]))
      emitter._events[event].unshift(fn);
    else
      emitter._events[event] = [fn, emitter._events[event]];
  }
}
function listenerCount (emitter, type) {
  return emitter.listeners(type).length;
}
function ReadableState(options, stream) {

  options = options || {};

  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  // A linked list is used to store data chunks instead of an array because the
  // linked list can remove elements from the beginning faster than
  // array.shift()
  this.buffer = new BufferList();
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // when piping, we only care about 'readable' events that happen
  // after read()ing all the bytes and not getting any pushback.
  this.ranOut = false;

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}
function Readable(options) {

  if (!(this instanceof Readable)) return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  if (options && typeof options.read === 'function') this._read = options.read;

  EventEmitter.call(this);
}

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;

  if (!state.objectMode && typeof chunk === 'string') {
    encoding = encoding || state.defaultEncoding;
    if (encoding !== state.encoding) {
      chunk = Buffer.from(chunk, encoding);
      encoding = '';
    }
  }

  return readableAddChunk(this, state, chunk, encoding, false);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
  var state = this._readableState;
  return readableAddChunk(this, state, chunk, '', true);
};

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
};

function readableAddChunk(stream, state, chunk, encoding, addToFront) {
  var er = chunkInvalid(state, chunk);
  if (er) {
    stream.emit('error', er);
  } else if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else if (state.objectMode || chunk && chunk.length > 0) {
    if (state.ended && !addToFront) {
      var e = new Error('stream.push() after EOF');
      stream.emit('error', e);
    } else if (state.endEmitted && addToFront) {
      var _e = new Error('stream.unshift() after end event');
      stream.emit('error', _e);
    } else {
      var skipAdd;
      if (state.decoder && !addToFront && !encoding) {
        chunk = state.decoder.write(chunk);
        skipAdd = !state.objectMode && chunk.length === 0;
      }

      if (!addToFront) state.reading = false;

      // Don't add to the buffer if we've decoded to an empty string chunk and
      // we're not in object mode
      if (!skipAdd) {
        // if we want the data now, just emit it.
        if (state.flowing && state.length === 0 && !state.sync) {
          stream.emit('data', chunk);
          stream.read(0);
        } else {
          // update the buffer info.
          state.length += state.objectMode ? 1 : chunk.length;
          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);

          if (state.needReadable) emitReadable(stream);
        }
      }

      maybeReadMore(stream, state);
    }
  } else if (!addToFront) {
    state.reading = false;
  }

  return needMoreData(state);
}

// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}

// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
  return this;
};

// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
  if (n <= 0 || state.length === 0 && state.ended) return 0;
  if (state.objectMode) return 1;
  if (n !== n) {
    // Only flow one buffer at a time
    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
  }
  // If we're asking for more than the current hwm, then raise the hwm.
  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
  if (n <= state.length) return n;
  // Don't have enough
  if (!state.ended) {
    state.needReadable = true;
    return 0;
  }
  return state.length;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
  debug$6('read', n);
  n = parseInt(n, 10);
  var state = this._readableState;
  var nOrig = n;

  if (n !== 0) state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
    debug$6('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;
  debug$6('need readable', doRead);

  // if we currently have less than the highWaterMark, then also read some
  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug$6('length less than watermark', doRead);
  }

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading) {
    doRead = false;
    debug$6('reading or ended', doRead);
  } else if (doRead) {
    debug$6('do read');
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0) state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
    // If _read pushed data synchronously, then `reading` will be false,
    // and we need to re-evaluate how much data we can return to the user.
    if (!state.reading) n = howMuchToRead(nOrig, state);
  }

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  } else {
    state.length -= n;
  }

  if (state.length === 0) {
    // If we have nothing in the buffer, then we want to know
    // as soon as we *do* get something into the buffer.
    if (!state.ended) state.needReadable = true;

    // If we tried to read() past the EOF, then emit end on the next tick.
    if (nOrig !== n && state.ended) endReadable(this);
  }

  if (ret !== null) this.emit('data', ret);

  return ret;
};

function chunkInvalid(state, chunk) {
  var er = null;
  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}

function onEofChunk(stream, state) {
  if (state.ended) return;
  if (state.decoder) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // emit 'readable' now to make sure it gets picked up.
  emitReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (!state.emittedReadable) {
    debug$6('emitReadable', state.flowing);
    state.emittedReadable = true;
    if (state.sync) nextTick(emitReadable_, stream);else emitReadable_(stream);
  }
}

function emitReadable_(stream) {
  debug$6('emit readable');
  stream.emit('readable');
  flow(stream);
}

// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    nextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
    debug$6('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;else len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
  this.emit('error', new Error('not implemented'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;
  debug$6('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

  var doEnd = (!pipeOpts || pipeOpts.end !== false);

  var endFn = doEnd ? onend : cleanup;
  if (state.endEmitted) nextTick(endFn);else src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable) {
    debug$6('onunpipe');
    if (readable === src) {
      cleanup();
    }
  }

  function onend() {
    debug$6('onend');
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  var cleanedUp = false;
  function cleanup() {
    debug$6('cleanup');
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', cleanup);
    src.removeListener('data', ondata);

    cleanedUp = true;

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  // If the user pushes more data while we're writing to dest then we'll end up
  // in ondata again. However, we only want to increase awaitDrain once because
  // dest will only emit one 'drain' event for the multiple writes.
  // => Introduce a guard on increasing awaitDrain.
  var increasedAwaitDrain = false;
  src.on('data', ondata);
  function ondata(chunk) {
    debug$6('ondata');
    increasedAwaitDrain = false;
    var ret = dest.write(chunk);
    if (false === ret && !increasedAwaitDrain) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      // => Check whether `dest` is still a piping destination.
      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
        debug$6('false write response, pause', src._readableState.awaitDrain);
        src._readableState.awaitDrain++;
        increasedAwaitDrain = true;
      }
      src.pause();
    }
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    debug$6('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (listenerCount(dest, 'error') === 0) dest.emit('error', er);
  }

  // Make sure our error handler is attached before userland ones.
  prependListener(dest, 'error', onerror);

  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    debug$6('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    debug$6('unpipe');
    src.unpipe(dest);
  }

  // tell the dest that it's being piped to
  dest.emit('pipe', src);

  // start the flow if it hasn't been started already.
  if (!state.flowing) {
    debug$6('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function () {
    var state = src._readableState;
    debug$6('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;
    if (state.awaitDrain === 0 && src.listeners('data').length) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;

  // if we're not piping anywhere, then do nothing.
  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.
  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;

    if (!dest) dest = state.pipes;

    // got a match.
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this);
    return this;
  }

  // slow case. multiple pipe destinations.

  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var _i = 0; _i < len; _i++) {
      dests[_i].emit('unpipe', this);
    }return this;
  }

  // try to find the right one.
  var i = indexOf(state.pipes, dest);
  if (i === -1) return this;

  state.pipes.splice(i, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];

  dest.emit('unpipe', this);

  return this;
};

// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
  var res = EventEmitter.prototype.on.call(this, ev, fn);

  if (ev === 'data') {
    // Start flowing on next tick if stream isn't explicitly paused
    if (this._readableState.flowing !== false) this.resume();
  } else if (ev === 'readable') {
    var state = this._readableState;
    if (!state.endEmitted && !state.readableListening) {
      state.readableListening = state.needReadable = true;
      state.emittedReadable = false;
      if (!state.reading) {
        nextTick(nReadingNextTick, this);
      } else if (state.length) {
        emitReadable(this);
      }
    }
  }

  return res;
};
Readable.prototype.addListener = Readable.prototype.on;

function nReadingNextTick(self) {
  debug$6('readable nexttick read 0');
  self.read(0);
}

// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
  var state = this._readableState;
  if (!state.flowing) {
    debug$6('resume');
    state.flowing = true;
    resume(this, state);
  }
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    nextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  if (!state.reading) {
    debug$6('resume read 0');
    stream.read(0);
  }

  state.resumeScheduled = false;
  state.awaitDrain = 0;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug$6('call pause flowing=%j', this._readableState.flowing);
  if (false !== this._readableState.flowing) {
    debug$6('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug$6('flow', state.flowing);
  while (state.flowing && stream.read() !== null) {}
}

// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
  var state = this._readableState;
  var paused = false;

  var self = this;
  stream.on('end', function () {
    debug$6('wrapped end');
    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) self.push(chunk);
    }

    self.push(null);
  });

  stream.on('data', function (chunk) {
    debug$6('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk);

    // don't skip over falsy values in objectMode
    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = self.push(chunk);
    if (!ret) {
      paused = true;
      stream.pause();
    }
  });

  // proxy all the other methods.
  // important when wrapping filters and duplexes.
  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function (method) {
        return function () {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  }

  // proxy certain important events.
  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
  forEach(events, function (ev) {
    stream.on(ev, self.emit.bind(self, ev));
  });

  // when we try to consume some more bytes, simply unpause the
  // underlying stream.
  self._read = function (n) {
    debug$6('wrapped _read', n);
    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return self;
};

// exposed for testing purposes only.
Readable._fromList = fromList;

// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
  // nothing buffered
  if (state.length === 0) return null;

  var ret;
  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
    // read it all, truncate the list
    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
    state.buffer.clear();
  } else {
    // read part of list
    ret = fromListPartial(n, state.buffer, state.decoder);
  }

  return ret;
}

// Extracts only enough buffered data to satisfy the amount requested.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromListPartial(n, list, hasStrings) {
  var ret;
  if (n < list.head.data.length) {
    // slice is the same for buffers and strings
    ret = list.head.data.slice(0, n);
    list.head.data = list.head.data.slice(n);
  } else if (n === list.head.data.length) {
    // first chunk is a perfect match
    ret = list.shift();
  } else {
    // result spans more than one buffer
    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
  }
  return ret;
}

// Copies a specified amount of characters from the list of buffered data
// chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBufferString(n, list) {
  var p = list.head;
  var c = 1;
  var ret = p.data;
  n -= ret.length;
  while (p = p.next) {
    var str = p.data;
    var nb = n > str.length ? str.length : n;
    if (nb === str.length) ret += str;else ret += str.slice(0, n);
    n -= nb;
    if (n === 0) {
      if (nb === str.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = str.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

// Copies a specified amount of bytes from the list of buffered data chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBuffer(n, list) {
  var ret = Buffer.allocUnsafe(n);
  var p = list.head;
  var c = 1;
  p.data.copy(ret);
  n -= p.data.length;
  while (p = p.next) {
    var buf = p.data;
    var nb = n > buf.length ? buf.length : n;
    buf.copy(ret, ret.length - n, 0, nb);
    n -= nb;
    if (n === 0) {
      if (nb === buf.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = buf.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;

  // If we get here before consuming all the bytes, then that is a
  // bug in node.  Should never happen.
  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');

  if (!state.endEmitted) {
    state.ended = true;
    nextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  // Check that we didn't get one last unshift.
  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');
  }
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }
  return -1;
}

// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.

Writable.WritableState = WritableState;
inherits(Writable, EventEmitter);

function nop() {}

function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
}

function WritableState(options, stream) {
  Object.defineProperty(this, 'buffer', {
    get: deprecate(function () {
      return this.getBuffer();
    }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
  });
  options = options || {};

  // object stream flag to indicate whether or not this stream
  // contains buffers or objects.
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

  // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  this.needDrain = false;
  // at the start of calling end()
  this.ending = false;
  // when end() has been called, and returned
  this.ended = false;
  // when 'finish' is emitted
  this.finished = false;

  // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.
  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.
  this.length = 0;

  // a flag to see when we're in the middle of a write.
  this.writing = false;

  // when true all writes will be buffered until .uncork() call
  this.corked = 0;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.
  this.bufferProcessing = false;

  // the callback that's passed to _write(chunk,cb)
  this.onwrite = function (er) {
    onwrite(stream, er);
  };

  // the callback that the user supplies to write(chunk,encoding,cb)
  this.writecb = null;

  // the amount that is being written when _write is called.
  this.writelen = 0;

  this.bufferedRequest = null;
  this.lastBufferedRequest = null;

  // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted
  this.pendingcb = 0;

  // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams
  this.prefinished = false;

  // True if the error was already emitted and should not be thrown again
  this.errorEmitted = false;

  // count buffered requests
  this.bufferedRequestCount = 0;

  // allocate the first CorkedRequest, there is always
  // one allocated and free to use, and we maintain at most two
  this.corkedRequestsFree = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function writableStateGetBuffer() {
  var current = this.bufferedRequest;
  var out = [];
  while (current) {
    out.push(current);
    current = current.next;
  }
  return out;
};
function Writable(options) {

  // Writable ctor is applied to Duplexes, though they're not
  // instanceof Writable, they're instanceof Readable.
  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);

  this._writableState = new WritableState(options, this);

  // legacy.
  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;

    if (typeof options.writev === 'function') this._writev = options.writev;
  }

  EventEmitter.call(this);
}

// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
  this.emit('error', new Error('Cannot pipe, not readable'));
};

function writeAfterEnd(stream, cb) {
  var er = new Error('write after end');
  // TODO: defer error events consistently everywhere, not just the cb
  stream.emit('error', er);
  nextTick(cb, er);
}

// If we get something that is not a buffer, string, null, or undefined,
// and we're not in objectMode, then that's an error.
// Otherwise stream chunks are all considered to be of length=1, and the
// watermarks determine how many objects to keep in the buffer, rather than
// how many bytes or characters.
function validChunk(stream, state, chunk, cb) {
  var valid = true;
  var er = false;
  // Always throw error if a null is written
  // if we are not in object mode then throw
  // if it is not a buffer, string, or undefined.
  if (chunk === null) {
    er = new TypeError('May not write null values to stream');
  } else if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  if (er) {
    stream.emit('error', er);
    nextTick(cb, er);
    valid = false;
  }
  return valid;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;

  if (typeof cb !== 'function') cb = nop;

  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, chunk, encoding, cb);
  }

  return ret;
};

Writable.prototype.cork = function () {
  var state = this._writableState;

  state.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;

    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
  this._writableState.defaultEncoding = encoding;
  return this;
};

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = Buffer.from(chunk, encoding);
  }
  return chunk;
}

// if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, chunk, encoding, cb) {
  chunk = decodeChunk(state, chunk, encoding);

  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
  var len = state.objectMode ? 1 : chunk.length;

  state.length += len;

  var ret = state.length < state.highWaterMark;
  // we must ensure that previous needDrain will not be reset to false.
  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }
    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;
  if (sync) nextTick(cb, er);else cb(er);

  stream._writableState.errorEmitted = true;
  stream.emit('error', er);
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;

  onwriteStateUpdate(state);

  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state);

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      /*<replacement>*/
        nextTick(afterWrite, stream, state, finished, cb);
      /*</replacement>*/
    } else {
        afterWrite(stream, state, finished, cb);
      }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
}

// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
}

// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;

    var count = 0;
    while (entry) {
      buffer[count] = entry;
      entry = entry.next;
      count += 1;
    }

    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

    // doWrite is almost always async, defer these to save a bit of time
    // as the hot path ends with doWrite
    state.pendingcb++;
    state.lastBufferedRequest = null;
    if (holder.next) {
      state.corkedRequestsFree = holder.next;
      holder.next = null;
    } else {
      state.corkedRequestsFree = new CorkedRequest(state);
    }
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;

      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.
      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequestCount = 0;
  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new Error('not implemented'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

  // .end() fully uncorks
  if (state.corked) {
    state.corked = 1;
    this.uncork();
  }

  // ignore unnecessary end() calls.
  if (!state.ending && !state.finished) endWritable(this, state, cb);
};

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}

function prefinish(stream, state) {
  if (!state.prefinished) {
    state.prefinished = true;
    stream.emit('prefinish');
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);
  if (need) {
    if (state.pendingcb === 0) {
      prefinish(stream, state);
      state.finished = true;
      stream.emit('finish');
    } else {
      prefinish(stream, state);
    }
  }
  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);
  if (cb) {
    if (state.finished) nextTick(cb);else stream.once('finish', cb);
  }
  state.ended = true;
  stream.writable = false;
}

// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;

  this.finish = function (err) {
    var entry = _this.entry;
    _this.entry = null;
    while (entry) {
      var cb = entry.callback;
      state.pendingcb--;
      cb(err);
      entry = entry.next;
    }
    if (state.corkedRequestsFree) {
      state.corkedRequestsFree.next = _this;
    } else {
      state.corkedRequestsFree = _this;
    }
  };
}

inherits(Duplex, Readable);

var keys = Object.keys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
  var method = keys[v];
  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}
function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false) this.readable = false;

  if (options && options.writable === false) this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended) return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  nextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

// a transform stream is a readable/writable stream where you do
// something with the data.  Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored.  (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation.  For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes.  When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up.  When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer.  When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks.  If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk.  However,
// a pathological inflate type of transform can cause excessive buffering
// here.  For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output.  In this case, you could write a very small
// amount of input, and end up with a very large amount of output.  In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform.  A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.

inherits(Transform, Duplex);

function TransformState(stream) {
  this.afterTransform = function (er, data) {
    return afterTransform(stream, er, data);
  };

  this.needTransform = false;
  this.transforming = false;
  this.writecb = null;
  this.writechunk = null;
  this.writeencoding = null;
}

function afterTransform(stream, er, data) {
  var ts = stream._transformState;
  ts.transforming = false;

  var cb = ts.writecb;

  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));

  ts.writechunk = null;
  ts.writecb = null;

  if (data !== null && data !== undefined) stream.push(data);

  cb(er);

  var rs = stream._readableState;
  rs.reading = false;
  if (rs.needReadable || rs.length < rs.highWaterMark) {
    stream._read(rs.highWaterMark);
  }
}
function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);

  Duplex.call(this, options);

  this._transformState = new TransformState(this);

  // when the writable side finishes, then flush out anything remaining.
  var stream = this;

  // start out asking for a readable event once data is transformed.
  this._readableState.needReadable = true;

  // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.
  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;

    if (typeof options.flush === 'function') this._flush = options.flush;
  }

  this.once('prefinish', function () {
    if (typeof this._flush === 'function') this._flush(function (er) {
      done(stream, er);
    });else done(stream);
  });
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
};

// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
  throw new Error('Not implemented');
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;
  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
};

// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
    ts.transforming = true;
    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

function done(stream, er) {
  if (er) return stream.emit('error', er);

  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided
  var ws = stream._writableState;
  var ts = stream._transformState;

  if (ws.length) throw new Error('Calling transform done when ws.length != 0');

  if (ts.transforming) throw new Error('Calling transform done when still transforming');

  return stream.push(null);
}

inherits(PassThrough, Transform);
function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};

inherits(Stream, EventEmitter);
Stream.Readable = Readable;
Stream.Writable = Writable;
Stream.Duplex = Duplex;
Stream.Transform = Transform;
Stream.PassThrough = PassThrough;

// Backwards-compat with node 0.4.x
Stream.Stream = Stream;

// old-style streams.  Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.

function Stream() {
  EventEmitter.call(this);
}

Stream.prototype.pipe = function(dest, options) {
  var source = this;

  function ondata(chunk) {
    if (dest.writable) {
      if (false === dest.write(chunk) && source.pause) {
        source.pause();
      }
    }
  }

  source.on('data', ondata);

  function ondrain() {
    if (source.readable && source.resume) {
      source.resume();
    }
  }

  dest.on('drain', ondrain);

  // If the 'end' option is not supplied, dest.end() will be called when
  // source gets the 'end' or 'close' events.  Only dest.end() once.
  if (!dest._isStdio && (!options || options.end !== false)) {
    source.on('end', onend);
    source.on('close', onclose);
  }

  var didOnEnd = false;
  function onend() {
    if (didOnEnd) return;
    didOnEnd = true;

    dest.end();
  }


  function onclose() {
    if (didOnEnd) return;
    didOnEnd = true;

    if (typeof dest.destroy === 'function') dest.destroy();
  }

  // don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    if (EventEmitter.listenerCount(this, 'error') === 0) {
      throw er; // Unhandled stream error in pipe.
    }
  }

  source.on('error', onerror);
  dest.on('error', onerror);

  // remove all the event listeners that were added.
  function cleanup() {
    source.removeListener('data', ondata);
    dest.removeListener('drain', ondrain);

    source.removeListener('end', onend);
    source.removeListener('close', onclose);

    source.removeListener('error', onerror);
    dest.removeListener('error', onerror);

    source.removeListener('end', cleanup);
    source.removeListener('close', cleanup);

    dest.removeListener('close', cleanup);
  }

  source.on('end', cleanup);
  source.on('close', cleanup);

  dest.on('close', cleanup);

  dest.emit('pipe', source);

  // Allow for unix-like usage: A.pipe(B).pipe(C)
  return dest;
};

var _polyfillNode_stream = /*#__PURE__*/Object.freeze({
	__proto__: null,
	Duplex: Duplex,
	PassThrough: PassThrough,
	Readable: Readable,
	Stream: Stream,
	Transform: Transform,
	Writable: Writable,
	default: Stream
});

var require$$0 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_stream);

var require$$1 = /*@__PURE__*/getAugmentedNamespace(_polyfillNode_string_decoder);

var hasRequiredSax;

function requireSax () {
	if (hasRequiredSax) return sax;
	hasRequiredSax = 1;
	(function (exports) {
(function (sax) { // wrapper for non-node envs
		  sax.parser = function (strict, opt) { return new SAXParser(strict, opt) };
		  sax.SAXParser = SAXParser;
		  sax.SAXStream = SAXStream;
		  sax.createStream = createStream;

		  // When we pass the MAX_BUFFER_LENGTH position, start checking for buffer overruns.
		  // When we check, schedule the next check for MAX_BUFFER_LENGTH - (max(buffer lengths)),
		  // since that's the earliest that a buffer overrun could occur.  This way, checks are
		  // as rare as required, but as often as necessary to ensure never crossing this bound.
		  // Furthermore, buffers are only tested at most once per write(), so passing a very
		  // large string into write() might have undesirable effects, but this is manageable by
		  // the caller, so it is assumed to be safe.  Thus, a call to write() may, in the extreme
		  // edge case, result in creating at most one complete copy of the string passed in.
		  // Set to Infinity to have unlimited buffers.
		  sax.MAX_BUFFER_LENGTH = 64 * 1024;

		  var buffers = [
		    'comment', 'sgmlDecl', 'textNode', 'tagName', 'doctype',
		    'procInstName', 'procInstBody', 'entity', 'attribName',
		    'attribValue', 'cdata', 'script'
		  ];

		  sax.EVENTS = [
		    'text',
		    'processinginstruction',
		    'sgmldeclaration',
		    'doctype',
		    'comment',
		    'opentagstart',
		    'attribute',
		    'opentag',
		    'closetag',
		    'opencdata',
		    'cdata',
		    'closecdata',
		    'error',
		    'end',
		    'ready',
		    'script',
		    'opennamespace',
		    'closenamespace'
		  ];

		  function SAXParser (strict, opt) {
		    if (!(this instanceof SAXParser)) {
		      return new SAXParser(strict, opt)
		    }

		    var parser = this;
		    clearBuffers(parser);
		    parser.q = parser.c = '';
		    parser.bufferCheckPosition = sax.MAX_BUFFER_LENGTH;
		    parser.opt = opt || {};
		    parser.opt.lowercase = parser.opt.lowercase || parser.opt.lowercasetags;
		    parser.looseCase = parser.opt.lowercase ? 'toLowerCase' : 'toUpperCase';
		    parser.tags = [];
		    parser.closed = parser.closedRoot = parser.sawRoot = false;
		    parser.tag = parser.error = null;
		    parser.strict = !!strict;
		    parser.noscript = !!(strict || parser.opt.noscript);
		    parser.state = S.BEGIN;
		    parser.strictEntities = parser.opt.strictEntities;
		    parser.ENTITIES = parser.strictEntities ? Object.create(sax.XML_ENTITIES) : Object.create(sax.ENTITIES);
		    parser.attribList = [];

		    // namespaces form a prototype chain.
		    // it always points at the current tag,
		    // which protos to its parent tag.
		    if (parser.opt.xmlns) {
		      parser.ns = Object.create(rootNS);
		    }

		    // mostly just for error reporting
		    parser.trackPosition = parser.opt.position !== false;
		    if (parser.trackPosition) {
		      parser.position = parser.line = parser.column = 0;
		    }
		    emit(parser, 'onready');
		  }

		  if (!Object.create) {
		    Object.create = function (o) {
		      function F () {}
		      F.prototype = o;
		      var newf = new F();
		      return newf
		    };
		  }

		  if (!Object.keys) {
		    Object.keys = function (o) {
		      var a = [];
		      for (var i in o) if (o.hasOwnProperty(i)) a.push(i);
		      return a
		    };
		  }

		  function checkBufferLength (parser) {
		    var maxAllowed = Math.max(sax.MAX_BUFFER_LENGTH, 10);
		    var maxActual = 0;
		    for (var i = 0, l = buffers.length; i < l; i++) {
		      var len = parser[buffers[i]].length;
		      if (len > maxAllowed) {
		        // Text/cdata nodes can get big, and since they're buffered,
		        // we can get here under normal conditions.
		        // Avoid issues by emitting the text node now,
		        // so at least it won't get any bigger.
		        switch (buffers[i]) {
		          case 'textNode':
		            closeText(parser);
		            break

		          case 'cdata':
		            emitNode(parser, 'oncdata', parser.cdata);
		            parser.cdata = '';
		            break

		          case 'script':
		            emitNode(parser, 'onscript', parser.script);
		            parser.script = '';
		            break

		          default:
		            error(parser, 'Max buffer length exceeded: ' + buffers[i]);
		        }
		      }
		      maxActual = Math.max(maxActual, len);
		    }
		    // schedule the next check for the earliest possible buffer overrun.
		    var m = sax.MAX_BUFFER_LENGTH - maxActual;
		    parser.bufferCheckPosition = m + parser.position;
		  }

		  function clearBuffers (parser) {
		    for (var i = 0, l = buffers.length; i < l; i++) {
		      parser[buffers[i]] = '';
		    }
		  }

		  function flushBuffers (parser) {
		    closeText(parser);
		    if (parser.cdata !== '') {
		      emitNode(parser, 'oncdata', parser.cdata);
		      parser.cdata = '';
		    }
		    if (parser.script !== '') {
		      emitNode(parser, 'onscript', parser.script);
		      parser.script = '';
		    }
		  }

		  SAXParser.prototype = {
		    end: function () { end(this); },
		    write: write,
		    resume: function () { this.error = null; return this },
		    close: function () { return this.write(null) },
		    flush: function () { flushBuffers(this); }
		  };

		  var Stream;
		  try {
		    Stream = require$$0.Stream;
		  } catch (ex) {
		    Stream = function () {};
		  }

		  var streamWraps = sax.EVENTS.filter(function (ev) {
		    return ev !== 'error' && ev !== 'end'
		  });

		  function createStream (strict, opt) {
		    return new SAXStream(strict, opt)
		  }

		  function SAXStream (strict, opt) {
		    if (!(this instanceof SAXStream)) {
		      return new SAXStream(strict, opt)
		    }

		    Stream.apply(this);

		    this._parser = new SAXParser(strict, opt);
		    this.writable = true;
		    this.readable = true;

		    var me = this;

		    this._parser.onend = function () {
		      me.emit('end');
		    };

		    this._parser.onerror = function (er) {
		      me.emit('error', er);

		      // if didn't throw, then means error was handled.
		      // go ahead and clear error, so we can write again.
		      me._parser.error = null;
		    };

		    this._decoder = null;

		    streamWraps.forEach(function (ev) {
		      Object.defineProperty(me, 'on' + ev, {
		        get: function () {
		          return me._parser['on' + ev]
		        },
		        set: function (h) {
		          if (!h) {
		            me.removeAllListeners(ev);
		            me._parser['on' + ev] = h;
		            return h
		          }
		          me.on(ev, h);
		        },
		        enumerable: true,
		        configurable: false
		      });
		    });
		  }

		  SAXStream.prototype = Object.create(Stream.prototype, {
		    constructor: {
		      value: SAXStream
		    }
		  });

		  SAXStream.prototype.write = function (data) {
		    if (typeof Buffer === 'function' &&
		      typeof Buffer.isBuffer === 'function' &&
		      Buffer.isBuffer(data)) {
		      if (!this._decoder) {
		        var SD = require$$1.StringDecoder;
		        this._decoder = new SD('utf8');
		      }
		      data = this._decoder.write(data);
		    }

		    this._parser.write(data.toString());
		    this.emit('data', data);
		    return true
		  };

		  SAXStream.prototype.end = function (chunk) {
		    if (chunk && chunk.length) {
		      this.write(chunk);
		    }
		    this._parser.end();
		    return true
		  };

		  SAXStream.prototype.on = function (ev, handler) {
		    var me = this;
		    if (!me._parser['on' + ev] && streamWraps.indexOf(ev) !== -1) {
		      me._parser['on' + ev] = function () {
		        var args = arguments.length === 1 ? [arguments[0]] : Array.apply(null, arguments);
		        args.splice(0, 0, ev);
		        me.emit.apply(me, args);
		      };
		    }

		    return Stream.prototype.on.call(me, ev, handler)
		  };

		  // this really needs to be replaced with character classes.
		  // XML allows all manner of ridiculous numbers and digits.
		  var CDATA = '[CDATA[';
		  var DOCTYPE = 'DOCTYPE';
		  var XML_NAMESPACE = 'http://www.w3.org/XML/1998/namespace';
		  var XMLNS_NAMESPACE = 'http://www.w3.org/2000/xmlns/';
		  var rootNS = { xml: XML_NAMESPACE, xmlns: XMLNS_NAMESPACE };

		  // http://www.w3.org/TR/REC-xml/#NT-NameStartChar
		  // This implementation works on strings, a single character at a time
		  // as such, it cannot ever support astral-plane characters (10000-EFFFF)
		  // without a significant breaking change to either this  parser, or the
		  // JavaScript language.  Implementation of an emoji-capable xml parser
		  // is left as an exercise for the reader.
		  var nameStart = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;

		  var nameBody = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u00B7\u0300-\u036F\u203F-\u2040.\d-]/;

		  var entityStart = /[#:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;
		  var entityBody = /[#:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u00B7\u0300-\u036F\u203F-\u2040.\d-]/;

		  function isWhitespace (c) {
		    return c === ' ' || c === '\n' || c === '\r' || c === '\t'
		  }

		  function isQuote (c) {
		    return c === '"' || c === '\''
		  }

		  function isAttribEnd (c) {
		    return c === '>' || isWhitespace(c)
		  }

		  function isMatch (regex, c) {
		    return regex.test(c)
		  }

		  function notMatch (regex, c) {
		    return !isMatch(regex, c)
		  }

		  var S = 0;
		  sax.STATE = {
		    BEGIN: S++, // leading byte order mark or whitespace
		    BEGIN_WHITESPACE: S++, // leading whitespace
		    TEXT: S++, // general stuff
		    TEXT_ENTITY: S++, // &amp and such.
		    OPEN_WAKA: S++, // <
		    SGML_DECL: S++, // <!BLARG
		    SGML_DECL_QUOTED: S++, // <!BLARG foo "bar
		    DOCTYPE: S++, // <!DOCTYPE
		    DOCTYPE_QUOTED: S++, // <!DOCTYPE "//blah
		    DOCTYPE_DTD: S++, // <!DOCTYPE "//blah" [ ...
		    DOCTYPE_DTD_QUOTED: S++, // <!DOCTYPE "//blah" [ "foo
		    COMMENT_STARTING: S++, // <!-
		    COMMENT: S++, // <!--
		    COMMENT_ENDING: S++, // <!-- blah -
		    COMMENT_ENDED: S++, // <!-- blah --
		    CDATA: S++, // <![CDATA[ something
		    CDATA_ENDING: S++, // ]
		    CDATA_ENDING_2: S++, // ]]
		    PROC_INST: S++, // <?hi
		    PROC_INST_BODY: S++, // <?hi there
		    PROC_INST_ENDING: S++, // <?hi "there" ?
		    OPEN_TAG: S++, // <strong
		    OPEN_TAG_SLASH: S++, // <strong /
		    ATTRIB: S++, // <a
		    ATTRIB_NAME: S++, // <a foo
		    ATTRIB_NAME_SAW_WHITE: S++, // <a foo _
		    ATTRIB_VALUE: S++, // <a foo=
		    ATTRIB_VALUE_QUOTED: S++, // <a foo="bar
		    ATTRIB_VALUE_CLOSED: S++, // <a foo="bar"
		    ATTRIB_VALUE_UNQUOTED: S++, // <a foo=bar
		    ATTRIB_VALUE_ENTITY_Q: S++, // <foo bar="&quot;"
		    ATTRIB_VALUE_ENTITY_U: S++, // <foo bar=&quot
		    CLOSE_TAG: S++, // </a
		    CLOSE_TAG_SAW_WHITE: S++, // </a   >
		    SCRIPT: S++, // <script> ...
		    SCRIPT_ENDING: S++ // <script> ... <
		  };

		  sax.XML_ENTITIES = {
		    'amp': '&',
		    'gt': '>',
		    'lt': '<',
		    'quot': '"',
		    'apos': "'"
		  };

		  sax.ENTITIES = {
		    'amp': '&',
		    'gt': '>',
		    'lt': '<',
		    'quot': '"',
		    'apos': "'",
		    'AElig': 198,
		    'Aacute': 193,
		    'Acirc': 194,
		    'Agrave': 192,
		    'Aring': 197,
		    'Atilde': 195,
		    'Auml': 196,
		    'Ccedil': 199,
		    'ETH': 208,
		    'Eacute': 201,
		    'Ecirc': 202,
		    'Egrave': 200,
		    'Euml': 203,
		    'Iacute': 205,
		    'Icirc': 206,
		    'Igrave': 204,
		    'Iuml': 207,
		    'Ntilde': 209,
		    'Oacute': 211,
		    'Ocirc': 212,
		    'Ograve': 210,
		    'Oslash': 216,
		    'Otilde': 213,
		    'Ouml': 214,
		    'THORN': 222,
		    'Uacute': 218,
		    'Ucirc': 219,
		    'Ugrave': 217,
		    'Uuml': 220,
		    'Yacute': 221,
		    'aacute': 225,
		    'acirc': 226,
		    'aelig': 230,
		    'agrave': 224,
		    'aring': 229,
		    'atilde': 227,
		    'auml': 228,
		    'ccedil': 231,
		    'eacute': 233,
		    'ecirc': 234,
		    'egrave': 232,
		    'eth': 240,
		    'euml': 235,
		    'iacute': 237,
		    'icirc': 238,
		    'igrave': 236,
		    'iuml': 239,
		    'ntilde': 241,
		    'oacute': 243,
		    'ocirc': 244,
		    'ograve': 242,
		    'oslash': 248,
		    'otilde': 245,
		    'ouml': 246,
		    'szlig': 223,
		    'thorn': 254,
		    'uacute': 250,
		    'ucirc': 251,
		    'ugrave': 249,
		    'uuml': 252,
		    'yacute': 253,
		    'yuml': 255,
		    'copy': 169,
		    'reg': 174,
		    'nbsp': 160,
		    'iexcl': 161,
		    'cent': 162,
		    'pound': 163,
		    'curren': 164,
		    'yen': 165,
		    'brvbar': 166,
		    'sect': 167,
		    'uml': 168,
		    'ordf': 170,
		    'laquo': 171,
		    'not': 172,
		    'shy': 173,
		    'macr': 175,
		    'deg': 176,
		    'plusmn': 177,
		    'sup1': 185,
		    'sup2': 178,
		    'sup3': 179,
		    'acute': 180,
		    'micro': 181,
		    'para': 182,
		    'middot': 183,
		    'cedil': 184,
		    'ordm': 186,
		    'raquo': 187,
		    'frac14': 188,
		    'frac12': 189,
		    'frac34': 190,
		    'iquest': 191,
		    'times': 215,
		    'divide': 247,
		    'OElig': 338,
		    'oelig': 339,
		    'Scaron': 352,
		    'scaron': 353,
		    'Yuml': 376,
		    'fnof': 402,
		    'circ': 710,
		    'tilde': 732,
		    'Alpha': 913,
		    'Beta': 914,
		    'Gamma': 915,
		    'Delta': 916,
		    'Epsilon': 917,
		    'Zeta': 918,
		    'Eta': 919,
		    'Theta': 920,
		    'Iota': 921,
		    'Kappa': 922,
		    'Lambda': 923,
		    'Mu': 924,
		    'Nu': 925,
		    'Xi': 926,
		    'Omicron': 927,
		    'Pi': 928,
		    'Rho': 929,
		    'Sigma': 931,
		    'Tau': 932,
		    'Upsilon': 933,
		    'Phi': 934,
		    'Chi': 935,
		    'Psi': 936,
		    'Omega': 937,
		    'alpha': 945,
		    'beta': 946,
		    'gamma': 947,
		    'delta': 948,
		    'epsilon': 949,
		    'zeta': 950,
		    'eta': 951,
		    'theta': 952,
		    'iota': 953,
		    'kappa': 954,
		    'lambda': 955,
		    'mu': 956,
		    'nu': 957,
		    'xi': 958,
		    'omicron': 959,
		    'pi': 960,
		    'rho': 961,
		    'sigmaf': 962,
		    'sigma': 963,
		    'tau': 964,
		    'upsilon': 965,
		    'phi': 966,
		    'chi': 967,
		    'psi': 968,
		    'omega': 969,
		    'thetasym': 977,
		    'upsih': 978,
		    'piv': 982,
		    'ensp': 8194,
		    'emsp': 8195,
		    'thinsp': 8201,
		    'zwnj': 8204,
		    'zwj': 8205,
		    'lrm': 8206,
		    'rlm': 8207,
		    'ndash': 8211,
		    'mdash': 8212,
		    'lsquo': 8216,
		    'rsquo': 8217,
		    'sbquo': 8218,
		    'ldquo': 8220,
		    'rdquo': 8221,
		    'bdquo': 8222,
		    'dagger': 8224,
		    'Dagger': 8225,
		    'bull': 8226,
		    'hellip': 8230,
		    'permil': 8240,
		    'prime': 8242,
		    'Prime': 8243,
		    'lsaquo': 8249,
		    'rsaquo': 8250,
		    'oline': 8254,
		    'frasl': 8260,
		    'euro': 8364,
		    'image': 8465,
		    'weierp': 8472,
		    'real': 8476,
		    'trade': 8482,
		    'alefsym': 8501,
		    'larr': 8592,
		    'uarr': 8593,
		    'rarr': 8594,
		    'darr': 8595,
		    'harr': 8596,
		    'crarr': 8629,
		    'lArr': 8656,
		    'uArr': 8657,
		    'rArr': 8658,
		    'dArr': 8659,
		    'hArr': 8660,
		    'forall': 8704,
		    'part': 8706,
		    'exist': 8707,
		    'empty': 8709,
		    'nabla': 8711,
		    'isin': 8712,
		    'notin': 8713,
		    'ni': 8715,
		    'prod': 8719,
		    'sum': 8721,
		    'minus': 8722,
		    'lowast': 8727,
		    'radic': 8730,
		    'prop': 8733,
		    'infin': 8734,
		    'ang': 8736,
		    'and': 8743,
		    'or': 8744,
		    'cap': 8745,
		    'cup': 8746,
		    'int': 8747,
		    'there4': 8756,
		    'sim': 8764,
		    'cong': 8773,
		    'asymp': 8776,
		    'ne': 8800,
		    'equiv': 8801,
		    'le': 8804,
		    'ge': 8805,
		    'sub': 8834,
		    'sup': 8835,
		    'nsub': 8836,
		    'sube': 8838,
		    'supe': 8839,
		    'oplus': 8853,
		    'otimes': 8855,
		    'perp': 8869,
		    'sdot': 8901,
		    'lceil': 8968,
		    'rceil': 8969,
		    'lfloor': 8970,
		    'rfloor': 8971,
		    'lang': 9001,
		    'rang': 9002,
		    'loz': 9674,
		    'spades': 9824,
		    'clubs': 9827,
		    'hearts': 9829,
		    'diams': 9830
		  };

		  Object.keys(sax.ENTITIES).forEach(function (key) {
		    var e = sax.ENTITIES[key];
		    var s = typeof e === 'number' ? String.fromCharCode(e) : e;
		    sax.ENTITIES[key] = s;
		  });

		  for (var s in sax.STATE) {
		    sax.STATE[sax.STATE[s]] = s;
		  }

		  // shorthand
		  S = sax.STATE;

		  function emit (parser, event, data) {
		    parser[event] && parser[event](data);
		  }

		  function emitNode (parser, nodeType, data) {
		    if (parser.textNode) closeText(parser);
		    emit(parser, nodeType, data);
		  }

		  function closeText (parser) {
		    parser.textNode = textopts(parser.opt, parser.textNode);
		    if (parser.textNode) emit(parser, 'ontext', parser.textNode);
		    parser.textNode = '';
		  }

		  function textopts (opt, text) {
		    if (opt.trim) text = text.trim();
		    if (opt.normalize) text = text.replace(/\s+/g, ' ');
		    return text
		  }

		  function error (parser, er) {
		    closeText(parser);
		    if (parser.trackPosition) {
		      er += '\nLine: ' + parser.line +
		        '\nColumn: ' + parser.column +
		        '\nChar: ' + parser.c;
		    }
		    er = new Error(er);
		    parser.error = er;
		    emit(parser, 'onerror', er);
		    return parser
		  }

		  function end (parser) {
		    if (parser.sawRoot && !parser.closedRoot) strictFail(parser, 'Unclosed root tag');
		    if ((parser.state !== S.BEGIN) &&
		      (parser.state !== S.BEGIN_WHITESPACE) &&
		      (parser.state !== S.TEXT)) {
		      error(parser, 'Unexpected end');
		    }
		    closeText(parser);
		    parser.c = '';
		    parser.closed = true;
		    emit(parser, 'onend');
		    SAXParser.call(parser, parser.strict, parser.opt);
		    return parser
		  }

		  function strictFail (parser, message) {
		    if (typeof parser !== 'object' || !(parser instanceof SAXParser)) {
		      throw new Error('bad call to strictFail')
		    }
		    if (parser.strict) {
		      error(parser, message);
		    }
		  }

		  function newTag (parser) {
		    if (!parser.strict) parser.tagName = parser.tagName[parser.looseCase]();
		    var parent = parser.tags[parser.tags.length - 1] || parser;
		    var tag = parser.tag = { name: parser.tagName, attributes: {} };

		    // will be overridden if tag contails an xmlns="foo" or xmlns:foo="bar"
		    if (parser.opt.xmlns) {
		      tag.ns = parent.ns;
		    }
		    parser.attribList.length = 0;
		    emitNode(parser, 'onopentagstart', tag);
		  }

		  function qname (name, attribute) {
		    var i = name.indexOf(':');
		    var qualName = i < 0 ? [ '', name ] : name.split(':');
		    var prefix = qualName[0];
		    var local = qualName[1];

		    // <x "xmlns"="http://foo">
		    if (attribute && name === 'xmlns') {
		      prefix = 'xmlns';
		      local = '';
		    }

		    return { prefix: prefix, local: local }
		  }

		  function attrib (parser) {
		    if (!parser.strict) {
		      parser.attribName = parser.attribName[parser.looseCase]();
		    }

		    if (parser.attribList.indexOf(parser.attribName) !== -1 ||
		      parser.tag.attributes.hasOwnProperty(parser.attribName)) {
		      parser.attribName = parser.attribValue = '';
		      return
		    }

		    if (parser.opt.xmlns) {
		      var qn = qname(parser.attribName, true);
		      var prefix = qn.prefix;
		      var local = qn.local;

		      if (prefix === 'xmlns') {
		        // namespace binding attribute. push the binding into scope
		        if (local === 'xml' && parser.attribValue !== XML_NAMESPACE) {
		          strictFail(parser,
		            'xml: prefix must be bound to ' + XML_NAMESPACE + '\n' +
		            'Actual: ' + parser.attribValue);
		        } else if (local === 'xmlns' && parser.attribValue !== XMLNS_NAMESPACE) {
		          strictFail(parser,
		            'xmlns: prefix must be bound to ' + XMLNS_NAMESPACE + '\n' +
		            'Actual: ' + parser.attribValue);
		        } else {
		          var tag = parser.tag;
		          var parent = parser.tags[parser.tags.length - 1] || parser;
		          if (tag.ns === parent.ns) {
		            tag.ns = Object.create(parent.ns);
		          }
		          tag.ns[local] = parser.attribValue;
		        }
		      }

		      // defer onattribute events until all attributes have been seen
		      // so any new bindings can take effect. preserve attribute order
		      // so deferred events can be emitted in document order
		      parser.attribList.push([parser.attribName, parser.attribValue]);
		    } else {
		      // in non-xmlns mode, we can emit the event right away
		      parser.tag.attributes[parser.attribName] = parser.attribValue;
		      emitNode(parser, 'onattribute', {
		        name: parser.attribName,
		        value: parser.attribValue
		      });
		    }

		    parser.attribName = parser.attribValue = '';
		  }

		  function openTag (parser, selfClosing) {
		    if (parser.opt.xmlns) {
		      // emit namespace binding events
		      var tag = parser.tag;

		      // add namespace info to tag
		      var qn = qname(parser.tagName);
		      tag.prefix = qn.prefix;
		      tag.local = qn.local;
		      tag.uri = tag.ns[qn.prefix] || '';

		      if (tag.prefix && !tag.uri) {
		        strictFail(parser, 'Unbound namespace prefix: ' +
		          JSON.stringify(parser.tagName));
		        tag.uri = qn.prefix;
		      }

		      var parent = parser.tags[parser.tags.length - 1] || parser;
		      if (tag.ns && parent.ns !== tag.ns) {
		        Object.keys(tag.ns).forEach(function (p) {
		          emitNode(parser, 'onopennamespace', {
		            prefix: p,
		            uri: tag.ns[p]
		          });
		        });
		      }

		      // handle deferred onattribute events
		      // Note: do not apply default ns to attributes:
		      //   http://www.w3.org/TR/REC-xml-names/#defaulting
		      for (var i = 0, l = parser.attribList.length; i < l; i++) {
		        var nv = parser.attribList[i];
		        var name = nv[0];
		        var value = nv[1];
		        var qualName = qname(name, true);
		        var prefix = qualName.prefix;
		        var local = qualName.local;
		        var uri = prefix === '' ? '' : (tag.ns[prefix] || '');
		        var a = {
		          name: name,
		          value: value,
		          prefix: prefix,
		          local: local,
		          uri: uri
		        };

		        // if there's any attributes with an undefined namespace,
		        // then fail on them now.
		        if (prefix && prefix !== 'xmlns' && !uri) {
		          strictFail(parser, 'Unbound namespace prefix: ' +
		            JSON.stringify(prefix));
		          a.uri = prefix;
		        }
		        parser.tag.attributes[name] = a;
		        emitNode(parser, 'onattribute', a);
		      }
		      parser.attribList.length = 0;
		    }

		    parser.tag.isSelfClosing = !!selfClosing;

		    // process the tag
		    parser.sawRoot = true;
		    parser.tags.push(parser.tag);
		    emitNode(parser, 'onopentag', parser.tag);
		    if (!selfClosing) {
		      // special case for <script> in non-strict mode.
		      if (!parser.noscript && parser.tagName.toLowerCase() === 'script') {
		        parser.state = S.SCRIPT;
		      } else {
		        parser.state = S.TEXT;
		      }
		      parser.tag = null;
		      parser.tagName = '';
		    }
		    parser.attribName = parser.attribValue = '';
		    parser.attribList.length = 0;
		  }

		  function closeTag (parser) {
		    if (!parser.tagName) {
		      strictFail(parser, 'Weird empty close tag.');
		      parser.textNode += '</>';
		      parser.state = S.TEXT;
		      return
		    }

		    if (parser.script) {
		      if (parser.tagName !== 'script') {
		        parser.script += '</' + parser.tagName + '>';
		        parser.tagName = '';
		        parser.state = S.SCRIPT;
		        return
		      }
		      emitNode(parser, 'onscript', parser.script);
		      parser.script = '';
		    }

		    // first make sure that the closing tag actually exists.
		    // <a><b></c></b></a> will close everything, otherwise.
		    var t = parser.tags.length;
		    var tagName = parser.tagName;
		    if (!parser.strict) {
		      tagName = tagName[parser.looseCase]();
		    }
		    var closeTo = tagName;
		    while (t--) {
		      var close = parser.tags[t];
		      if (close.name !== closeTo) {
		        // fail the first time in strict mode
		        strictFail(parser, 'Unexpected close tag');
		      } else {
		        break
		      }
		    }

		    // didn't find it.  we already failed for strict, so just abort.
		    if (t < 0) {
		      strictFail(parser, 'Unmatched closing tag: ' + parser.tagName);
		      parser.textNode += '</' + parser.tagName + '>';
		      parser.state = S.TEXT;
		      return
		    }
		    parser.tagName = tagName;
		    var s = parser.tags.length;
		    while (s-- > t) {
		      var tag = parser.tag = parser.tags.pop();
		      parser.tagName = parser.tag.name;
		      emitNode(parser, 'onclosetag', parser.tagName);

		      var x = {};
		      for (var i in tag.ns) {
		        x[i] = tag.ns[i];
		      }

		      var parent = parser.tags[parser.tags.length - 1] || parser;
		      if (parser.opt.xmlns && tag.ns !== parent.ns) {
		        // remove namespace bindings introduced by tag
		        Object.keys(tag.ns).forEach(function (p) {
		          var n = tag.ns[p];
		          emitNode(parser, 'onclosenamespace', { prefix: p, uri: n });
		        });
		      }
		    }
		    if (t === 0) parser.closedRoot = true;
		    parser.tagName = parser.attribValue = parser.attribName = '';
		    parser.attribList.length = 0;
		    parser.state = S.TEXT;
		  }

		  function parseEntity (parser) {
		    var entity = parser.entity;
		    var entityLC = entity.toLowerCase();
		    var num;
		    var numStr = '';

		    if (parser.ENTITIES[entity]) {
		      return parser.ENTITIES[entity]
		    }
		    if (parser.ENTITIES[entityLC]) {
		      return parser.ENTITIES[entityLC]
		    }
		    entity = entityLC;
		    if (entity.charAt(0) === '#') {
		      if (entity.charAt(1) === 'x') {
		        entity = entity.slice(2);
		        num = parseInt(entity, 16);
		        numStr = num.toString(16);
		      } else {
		        entity = entity.slice(1);
		        num = parseInt(entity, 10);
		        numStr = num.toString(10);
		      }
		    }
		    entity = entity.replace(/^0+/, '');
		    if (isNaN(num) || numStr.toLowerCase() !== entity) {
		      strictFail(parser, 'Invalid character entity');
		      return '&' + parser.entity + ';'
		    }

		    return String.fromCodePoint(num)
		  }

		  function beginWhiteSpace (parser, c) {
		    if (c === '<') {
		      parser.state = S.OPEN_WAKA;
		      parser.startTagPosition = parser.position;
		    } else if (!isWhitespace(c)) {
		      // have to process this as a text node.
		      // weird, but happens.
		      strictFail(parser, 'Non-whitespace before first tag.');
		      parser.textNode = c;
		      parser.state = S.TEXT;
		    }
		  }

		  function charAt (chunk, i) {
		    var result = '';
		    if (i < chunk.length) {
		      result = chunk.charAt(i);
		    }
		    return result
		  }

		  function write (chunk) {
		    var parser = this;
		    if (this.error) {
		      throw this.error
		    }
		    if (parser.closed) {
		      return error(parser,
		        'Cannot write after close. Assign an onready handler.')
		    }
		    if (chunk === null) {
		      return end(parser)
		    }
		    if (typeof chunk === 'object') {
		      chunk = chunk.toString();
		    }
		    var i = 0;
		    var c = '';
		    while (true) {
		      c = charAt(chunk, i++);
		      parser.c = c;

		      if (!c) {
		        break
		      }

		      if (parser.trackPosition) {
		        parser.position++;
		        if (c === '\n') {
		          parser.line++;
		          parser.column = 0;
		        } else {
		          parser.column++;
		        }
		      }

		      switch (parser.state) {
		        case S.BEGIN:
		          parser.state = S.BEGIN_WHITESPACE;
		          if (c === '\uFEFF') {
		            continue
		          }
		          beginWhiteSpace(parser, c);
		          continue

		        case S.BEGIN_WHITESPACE:
		          beginWhiteSpace(parser, c);
		          continue

		        case S.TEXT:
		          if (parser.sawRoot && !parser.closedRoot) {
		            var starti = i - 1;
		            while (c && c !== '<' && c !== '&') {
		              c = charAt(chunk, i++);
		              if (c && parser.trackPosition) {
		                parser.position++;
		                if (c === '\n') {
		                  parser.line++;
		                  parser.column = 0;
		                } else {
		                  parser.column++;
		                }
		              }
		            }
		            parser.textNode += chunk.substring(starti, i - 1);
		          }
		          if (c === '<' && !(parser.sawRoot && parser.closedRoot && !parser.strict)) {
		            parser.state = S.OPEN_WAKA;
		            parser.startTagPosition = parser.position;
		          } else {
		            if (!isWhitespace(c) && (!parser.sawRoot || parser.closedRoot)) {
		              strictFail(parser, 'Text data outside of root node.');
		            }
		            if (c === '&') {
		              parser.state = S.TEXT_ENTITY;
		            } else {
		              parser.textNode += c;
		            }
		          }
		          continue

		        case S.SCRIPT:
		          // only non-strict
		          if (c === '<') {
		            parser.state = S.SCRIPT_ENDING;
		          } else {
		            parser.script += c;
		          }
		          continue

		        case S.SCRIPT_ENDING:
		          if (c === '/') {
		            parser.state = S.CLOSE_TAG;
		          } else {
		            parser.script += '<' + c;
		            parser.state = S.SCRIPT;
		          }
		          continue

		        case S.OPEN_WAKA:
		          // either a /, ?, !, or text is coming next.
		          if (c === '!') {
		            parser.state = S.SGML_DECL;
		            parser.sgmlDecl = '';
		          } else if (isWhitespace(c)) ; else if (isMatch(nameStart, c)) {
		            parser.state = S.OPEN_TAG;
		            parser.tagName = c;
		          } else if (c === '/') {
		            parser.state = S.CLOSE_TAG;
		            parser.tagName = '';
		          } else if (c === '?') {
		            parser.state = S.PROC_INST;
		            parser.procInstName = parser.procInstBody = '';
		          } else {
		            strictFail(parser, 'Unencoded <');
		            // if there was some whitespace, then add that in.
		            if (parser.startTagPosition + 1 < parser.position) {
		              var pad = parser.position - parser.startTagPosition;
		              c = new Array(pad).join(' ') + c;
		            }
		            parser.textNode += '<' + c;
		            parser.state = S.TEXT;
		          }
		          continue

		        case S.SGML_DECL:
		          if ((parser.sgmlDecl + c).toUpperCase() === CDATA) {
		            emitNode(parser, 'onopencdata');
		            parser.state = S.CDATA;
		            parser.sgmlDecl = '';
		            parser.cdata = '';
		          } else if (parser.sgmlDecl + c === '--') {
		            parser.state = S.COMMENT;
		            parser.comment = '';
		            parser.sgmlDecl = '';
		          } else if ((parser.sgmlDecl + c).toUpperCase() === DOCTYPE) {
		            parser.state = S.DOCTYPE;
		            if (parser.doctype || parser.sawRoot) {
		              strictFail(parser,
		                'Inappropriately located doctype declaration');
		            }
		            parser.doctype = '';
		            parser.sgmlDecl = '';
		          } else if (c === '>') {
		            emitNode(parser, 'onsgmldeclaration', parser.sgmlDecl);
		            parser.sgmlDecl = '';
		            parser.state = S.TEXT;
		          } else if (isQuote(c)) {
		            parser.state = S.SGML_DECL_QUOTED;
		            parser.sgmlDecl += c;
		          } else {
		            parser.sgmlDecl += c;
		          }
		          continue

		        case S.SGML_DECL_QUOTED:
		          if (c === parser.q) {
		            parser.state = S.SGML_DECL;
		            parser.q = '';
		          }
		          parser.sgmlDecl += c;
		          continue

		        case S.DOCTYPE:
		          if (c === '>') {
		            parser.state = S.TEXT;
		            emitNode(parser, 'ondoctype', parser.doctype);
		            parser.doctype = true; // just remember that we saw it.
		          } else {
		            parser.doctype += c;
		            if (c === '[') {
		              parser.state = S.DOCTYPE_DTD;
		            } else if (isQuote(c)) {
		              parser.state = S.DOCTYPE_QUOTED;
		              parser.q = c;
		            }
		          }
		          continue

		        case S.DOCTYPE_QUOTED:
		          parser.doctype += c;
		          if (c === parser.q) {
		            parser.q = '';
		            parser.state = S.DOCTYPE;
		          }
		          continue

		        case S.DOCTYPE_DTD:
		          parser.doctype += c;
		          if (c === ']') {
		            parser.state = S.DOCTYPE;
		          } else if (isQuote(c)) {
		            parser.state = S.DOCTYPE_DTD_QUOTED;
		            parser.q = c;
		          }
		          continue

		        case S.DOCTYPE_DTD_QUOTED:
		          parser.doctype += c;
		          if (c === parser.q) {
		            parser.state = S.DOCTYPE_DTD;
		            parser.q = '';
		          }
		          continue

		        case S.COMMENT:
		          if (c === '-') {
		            parser.state = S.COMMENT_ENDING;
		          } else {
		            parser.comment += c;
		          }
		          continue

		        case S.COMMENT_ENDING:
		          if (c === '-') {
		            parser.state = S.COMMENT_ENDED;
		            parser.comment = textopts(parser.opt, parser.comment);
		            if (parser.comment) {
		              emitNode(parser, 'oncomment', parser.comment);
		            }
		            parser.comment = '';
		          } else {
		            parser.comment += '-' + c;
		            parser.state = S.COMMENT;
		          }
		          continue

		        case S.COMMENT_ENDED:
		          if (c !== '>') {
		            strictFail(parser, 'Malformed comment');
		            // allow <!-- blah -- bloo --> in non-strict mode,
		            // which is a comment of " blah -- bloo "
		            parser.comment += '--' + c;
		            parser.state = S.COMMENT;
		          } else {
		            parser.state = S.TEXT;
		          }
		          continue

		        case S.CDATA:
		          if (c === ']') {
		            parser.state = S.CDATA_ENDING;
		          } else {
		            parser.cdata += c;
		          }
		          continue

		        case S.CDATA_ENDING:
		          if (c === ']') {
		            parser.state = S.CDATA_ENDING_2;
		          } else {
		            parser.cdata += ']' + c;
		            parser.state = S.CDATA;
		          }
		          continue

		        case S.CDATA_ENDING_2:
		          if (c === '>') {
		            if (parser.cdata) {
		              emitNode(parser, 'oncdata', parser.cdata);
		            }
		            emitNode(parser, 'onclosecdata');
		            parser.cdata = '';
		            parser.state = S.TEXT;
		          } else if (c === ']') {
		            parser.cdata += ']';
		          } else {
		            parser.cdata += ']]' + c;
		            parser.state = S.CDATA;
		          }
		          continue

		        case S.PROC_INST:
		          if (c === '?') {
		            parser.state = S.PROC_INST_ENDING;
		          } else if (isWhitespace(c)) {
		            parser.state = S.PROC_INST_BODY;
		          } else {
		            parser.procInstName += c;
		          }
		          continue

		        case S.PROC_INST_BODY:
		          if (!parser.procInstBody && isWhitespace(c)) {
		            continue
		          } else if (c === '?') {
		            parser.state = S.PROC_INST_ENDING;
		          } else {
		            parser.procInstBody += c;
		          }
		          continue

		        case S.PROC_INST_ENDING:
		          if (c === '>') {
		            emitNode(parser, 'onprocessinginstruction', {
		              name: parser.procInstName,
		              body: parser.procInstBody
		            });
		            parser.procInstName = parser.procInstBody = '';
		            parser.state = S.TEXT;
		          } else {
		            parser.procInstBody += '?' + c;
		            parser.state = S.PROC_INST_BODY;
		          }
		          continue

		        case S.OPEN_TAG:
		          if (isMatch(nameBody, c)) {
		            parser.tagName += c;
		          } else {
		            newTag(parser);
		            if (c === '>') {
		              openTag(parser);
		            } else if (c === '/') {
		              parser.state = S.OPEN_TAG_SLASH;
		            } else {
		              if (!isWhitespace(c)) {
		                strictFail(parser, 'Invalid character in tag name');
		              }
		              parser.state = S.ATTRIB;
		            }
		          }
		          continue

		        case S.OPEN_TAG_SLASH:
		          if (c === '>') {
		            openTag(parser, true);
		            closeTag(parser);
		          } else {
		            strictFail(parser, 'Forward-slash in opening tag not followed by >');
		            parser.state = S.ATTRIB;
		          }
		          continue

		        case S.ATTRIB:
		          // haven't read the attribute name yet.
		          if (isWhitespace(c)) {
		            continue
		          } else if (c === '>') {
		            openTag(parser);
		          } else if (c === '/') {
		            parser.state = S.OPEN_TAG_SLASH;
		          } else if (isMatch(nameStart, c)) {
		            parser.attribName = c;
		            parser.attribValue = '';
		            parser.state = S.ATTRIB_NAME;
		          } else {
		            strictFail(parser, 'Invalid attribute name');
		          }
		          continue

		        case S.ATTRIB_NAME:
		          if (c === '=') {
		            parser.state = S.ATTRIB_VALUE;
		          } else if (c === '>') {
		            strictFail(parser, 'Attribute without value');
		            parser.attribValue = parser.attribName;
		            attrib(parser);
		            openTag(parser);
		          } else if (isWhitespace(c)) {
		            parser.state = S.ATTRIB_NAME_SAW_WHITE;
		          } else if (isMatch(nameBody, c)) {
		            parser.attribName += c;
		          } else {
		            strictFail(parser, 'Invalid attribute name');
		          }
		          continue

		        case S.ATTRIB_NAME_SAW_WHITE:
		          if (c === '=') {
		            parser.state = S.ATTRIB_VALUE;
		          } else if (isWhitespace(c)) {
		            continue
		          } else {
		            strictFail(parser, 'Attribute without value');
		            parser.tag.attributes[parser.attribName] = '';
		            parser.attribValue = '';
		            emitNode(parser, 'onattribute', {
		              name: parser.attribName,
		              value: ''
		            });
		            parser.attribName = '';
		            if (c === '>') {
		              openTag(parser);
		            } else if (isMatch(nameStart, c)) {
		              parser.attribName = c;
		              parser.state = S.ATTRIB_NAME;
		            } else {
		              strictFail(parser, 'Invalid attribute name');
		              parser.state = S.ATTRIB;
		            }
		          }
		          continue

		        case S.ATTRIB_VALUE:
		          if (isWhitespace(c)) {
		            continue
		          } else if (isQuote(c)) {
		            parser.q = c;
		            parser.state = S.ATTRIB_VALUE_QUOTED;
		          } else {
		            strictFail(parser, 'Unquoted attribute value');
		            parser.state = S.ATTRIB_VALUE_UNQUOTED;
		            parser.attribValue = c;
		          }
		          continue

		        case S.ATTRIB_VALUE_QUOTED:
		          if (c !== parser.q) {
		            if (c === '&') {
		              parser.state = S.ATTRIB_VALUE_ENTITY_Q;
		            } else {
		              parser.attribValue += c;
		            }
		            continue
		          }
		          attrib(parser);
		          parser.q = '';
		          parser.state = S.ATTRIB_VALUE_CLOSED;
		          continue

		        case S.ATTRIB_VALUE_CLOSED:
		          if (isWhitespace(c)) {
		            parser.state = S.ATTRIB;
		          } else if (c === '>') {
		            openTag(parser);
		          } else if (c === '/') {
		            parser.state = S.OPEN_TAG_SLASH;
		          } else if (isMatch(nameStart, c)) {
		            strictFail(parser, 'No whitespace between attributes');
		            parser.attribName = c;
		            parser.attribValue = '';
		            parser.state = S.ATTRIB_NAME;
		          } else {
		            strictFail(parser, 'Invalid attribute name');
		          }
		          continue

		        case S.ATTRIB_VALUE_UNQUOTED:
		          if (!isAttribEnd(c)) {
		            if (c === '&') {
		              parser.state = S.ATTRIB_VALUE_ENTITY_U;
		            } else {
		              parser.attribValue += c;
		            }
		            continue
		          }
		          attrib(parser);
		          if (c === '>') {
		            openTag(parser);
		          } else {
		            parser.state = S.ATTRIB;
		          }
		          continue

		        case S.CLOSE_TAG:
		          if (!parser.tagName) {
		            if (isWhitespace(c)) {
		              continue
		            } else if (notMatch(nameStart, c)) {
		              if (parser.script) {
		                parser.script += '</' + c;
		                parser.state = S.SCRIPT;
		              } else {
		                strictFail(parser, 'Invalid tagname in closing tag.');
		              }
		            } else {
		              parser.tagName = c;
		            }
		          } else if (c === '>') {
		            closeTag(parser);
		          } else if (isMatch(nameBody, c)) {
		            parser.tagName += c;
		          } else if (parser.script) {
		            parser.script += '</' + parser.tagName;
		            parser.tagName = '';
		            parser.state = S.SCRIPT;
		          } else {
		            if (!isWhitespace(c)) {
		              strictFail(parser, 'Invalid tagname in closing tag');
		            }
		            parser.state = S.CLOSE_TAG_SAW_WHITE;
		          }
		          continue

		        case S.CLOSE_TAG_SAW_WHITE:
		          if (isWhitespace(c)) {
		            continue
		          }
		          if (c === '>') {
		            closeTag(parser);
		          } else {
		            strictFail(parser, 'Invalid characters in closing tag');
		          }
		          continue

		        case S.TEXT_ENTITY:
		        case S.ATTRIB_VALUE_ENTITY_Q:
		        case S.ATTRIB_VALUE_ENTITY_U:
		          var returnState;
		          var buffer;
		          switch (parser.state) {
		            case S.TEXT_ENTITY:
		              returnState = S.TEXT;
		              buffer = 'textNode';
		              break

		            case S.ATTRIB_VALUE_ENTITY_Q:
		              returnState = S.ATTRIB_VALUE_QUOTED;
		              buffer = 'attribValue';
		              break

		            case S.ATTRIB_VALUE_ENTITY_U:
		              returnState = S.ATTRIB_VALUE_UNQUOTED;
		              buffer = 'attribValue';
		              break
		          }

		          if (c === ';') {
		            parser[buffer] += parseEntity(parser);
		            parser.entity = '';
		            parser.state = returnState;
		          } else if (isMatch(parser.entity.length ? entityBody : entityStart, c)) {
		            parser.entity += c;
		          } else {
		            strictFail(parser, 'Invalid character in entity name');
		            parser[buffer] += '&' + parser.entity + c;
		            parser.entity = '';
		            parser.state = returnState;
		          }

		          continue

		        default:
		          throw new Error(parser, 'Unknown state: ' + parser.state)
		      }
		    } // while

		    if (parser.position >= parser.bufferCheckPosition) {
		      checkBufferLength(parser);
		    }
		    return parser
		  }

		  /*! http://mths.be/fromcodepoint v0.1.0 by @mathias */
		  /* istanbul ignore next */
		  if (!String.fromCodePoint) {
		    (function () {
		      var stringFromCharCode = String.fromCharCode;
		      var floor = Math.floor;
		      var fromCodePoint = function () {
		        var MAX_SIZE = 0x4000;
		        var codeUnits = [];
		        var highSurrogate;
		        var lowSurrogate;
		        var index = -1;
		        var length = arguments.length;
		        if (!length) {
		          return ''
		        }
		        var result = '';
		        while (++index < length) {
		          var codePoint = Number(arguments[index]);
		          if (
		            !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
		            codePoint < 0 || // not a valid Unicode code point
		            codePoint > 0x10FFFF || // not a valid Unicode code point
		            floor(codePoint) !== codePoint // not an integer
		          ) {
		            throw RangeError('Invalid code point: ' + codePoint)
		          }
		          if (codePoint <= 0xFFFF) { // BMP code point
		            codeUnits.push(codePoint);
		          } else { // Astral code point; split in surrogate halves
		            // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
		            codePoint -= 0x10000;
		            highSurrogate = (codePoint >> 10) + 0xD800;
		            lowSurrogate = (codePoint % 0x400) + 0xDC00;
		            codeUnits.push(highSurrogate, lowSurrogate);
		          }
		          if (index + 1 === length || codeUnits.length > MAX_SIZE) {
		            result += stringFromCharCode.apply(null, codeUnits);
		            codeUnits.length = 0;
		          }
		        }
		        return result
		      };
		      /* istanbul ignore next */
		      if (Object.defineProperty) {
		        Object.defineProperty(String, 'fromCodePoint', {
		          value: fromCodePoint,
		          configurable: true,
		          writable: true
		        });
		      } else {
		        String.fromCodePoint = fromCodePoint;
		      }
		    }());
		  }
		})(exports); 
	} (sax));
	return sax;
}

var arrayHelper;
var hasRequiredArrayHelper;

function requireArrayHelper () {
	if (hasRequiredArrayHelper) return arrayHelper;
	hasRequiredArrayHelper = 1;
	arrayHelper = {

	  isArray: function(value) {
	    if (Array.isArray) {
	      return Array.isArray(value);
	    }
	    // fallback for older browsers like  IE 8
	    return Object.prototype.toString.call( value ) === '[object Array]';
	  }

	};
	return arrayHelper;
}

var optionsHelper;
var hasRequiredOptionsHelper;

function requireOptionsHelper () {
	if (hasRequiredOptionsHelper) return optionsHelper;
	hasRequiredOptionsHelper = 1;
	var isArray = requireArrayHelper().isArray;

	optionsHelper = {

	  copyOptions: function (options) {
	    var key, copy = {};
	    for (key in options) {
	      if (options.hasOwnProperty(key)) {
	        copy[key] = options[key];
	      }
	    }
	    return copy;
	  },

	  ensureFlagExists: function (item, options) {
	    if (!(item in options) || typeof options[item] !== 'boolean') {
	      options[item] = false;
	    }
	  },

	  ensureSpacesExists: function (options) {
	    if (!('spaces' in options) || (typeof options.spaces !== 'number' && typeof options.spaces !== 'string')) {
	      options.spaces = 0;
	    }
	  },

	  ensureAlwaysArrayExists: function (options) {
	    if (!('alwaysArray' in options) || (typeof options.alwaysArray !== 'boolean' && !isArray(options.alwaysArray))) {
	      options.alwaysArray = false;
	    }
	  },

	  ensureKeyExists: function (key, options) {
	    if (!(key + 'Key' in options) || typeof options[key + 'Key'] !== 'string') {
	      options[key + 'Key'] = options.compact ? '_' + key : key;
	    }
	  },

	  checkFnExists: function (key, options) {
	    return key + 'Fn' in options;
	  }

	};
	return optionsHelper;
}

var xml2js;
var hasRequiredXml2js;

function requireXml2js () {
	if (hasRequiredXml2js) return xml2js;
	hasRequiredXml2js = 1;
	var sax = requireSax();
	var helper = requireOptionsHelper();
	var isArray = requireArrayHelper().isArray;

	var options;
	var currentElement;

	function validateOptions(userOptions) {
	  options = helper.copyOptions(userOptions);
	  helper.ensureFlagExists('ignoreDeclaration', options);
	  helper.ensureFlagExists('ignoreInstruction', options);
	  helper.ensureFlagExists('ignoreAttributes', options);
	  helper.ensureFlagExists('ignoreText', options);
	  helper.ensureFlagExists('ignoreComment', options);
	  helper.ensureFlagExists('ignoreCdata', options);
	  helper.ensureFlagExists('ignoreDoctype', options);
	  helper.ensureFlagExists('compact', options);
	  helper.ensureFlagExists('alwaysChildren', options);
	  helper.ensureFlagExists('addParent', options);
	  helper.ensureFlagExists('trim', options);
	  helper.ensureFlagExists('nativeType', options);
	  helper.ensureFlagExists('nativeTypeAttributes', options);
	  helper.ensureFlagExists('sanitize', options);
	  helper.ensureFlagExists('instructionHasAttributes', options);
	  helper.ensureFlagExists('captureSpacesBetweenElements', options);
	  helper.ensureAlwaysArrayExists(options);
	  helper.ensureKeyExists('declaration', options);
	  helper.ensureKeyExists('instruction', options);
	  helper.ensureKeyExists('attributes', options);
	  helper.ensureKeyExists('text', options);
	  helper.ensureKeyExists('comment', options);
	  helper.ensureKeyExists('cdata', options);
	  helper.ensureKeyExists('doctype', options);
	  helper.ensureKeyExists('type', options);
	  helper.ensureKeyExists('name', options);
	  helper.ensureKeyExists('elements', options);
	  helper.ensureKeyExists('parent', options);
	  helper.checkFnExists('doctype', options);
	  helper.checkFnExists('instruction', options);
	  helper.checkFnExists('cdata', options);
	  helper.checkFnExists('comment', options);
	  helper.checkFnExists('text', options);
	  helper.checkFnExists('instructionName', options);
	  helper.checkFnExists('elementName', options);
	  helper.checkFnExists('attributeName', options);
	  helper.checkFnExists('attributeValue', options);
	  helper.checkFnExists('attributes', options);
	  return options;
	}

	function nativeType(value) {
	  var nValue = Number(value);
	  if (!isNaN(nValue)) {
	    return nValue;
	  }
	  var bValue = value.toLowerCase();
	  if (bValue === 'true') {
	    return true;
	  } else if (bValue === 'false') {
	    return false;
	  }
	  return value;
	}

	function addField(type, value) {
	  var key;
	  if (options.compact) {
	    if (
	      !currentElement[options[type + 'Key']] &&
	      (isArray(options.alwaysArray) ? options.alwaysArray.indexOf(options[type + 'Key']) !== -1 : options.alwaysArray)
	    ) {
	      currentElement[options[type + 'Key']] = [];
	    }
	    if (currentElement[options[type + 'Key']] && !isArray(currentElement[options[type + 'Key']])) {
	      currentElement[options[type + 'Key']] = [currentElement[options[type + 'Key']]];
	    }
	    if (type + 'Fn' in options && typeof value === 'string') {
	      value = options[type + 'Fn'](value, currentElement);
	    }
	    if (type === 'instruction' && ('instructionFn' in options || 'instructionNameFn' in options)) {
	      for (key in value) {
	        if (value.hasOwnProperty(key)) {
	          if ('instructionFn' in options) {
	            value[key] = options.instructionFn(value[key], key, currentElement);
	          } else {
	            var temp = value[key];
	            delete value[key];
	            value[options.instructionNameFn(key, temp, currentElement)] = temp;
	          }
	        }
	      }
	    }
	    if (isArray(currentElement[options[type + 'Key']])) {
	      currentElement[options[type + 'Key']].push(value);
	    } else {
	      currentElement[options[type + 'Key']] = value;
	    }
	  } else {
	    if (!currentElement[options.elementsKey]) {
	      currentElement[options.elementsKey] = [];
	    }
	    var element = {};
	    element[options.typeKey] = type;
	    if (type === 'instruction') {
	      for (key in value) {
	        if (value.hasOwnProperty(key)) {
	          break;
	        }
	      }
	      element[options.nameKey] = 'instructionNameFn' in options ? options.instructionNameFn(key, value, currentElement) : key;
	      if (options.instructionHasAttributes) {
	        element[options.attributesKey] = value[key][options.attributesKey];
	        if ('instructionFn' in options) {
	          element[options.attributesKey] = options.instructionFn(element[options.attributesKey], key, currentElement);
	        }
	      } else {
	        if ('instructionFn' in options) {
	          value[key] = options.instructionFn(value[key], key, currentElement);
	        }
	        element[options.instructionKey] = value[key];
	      }
	    } else {
	      if (type + 'Fn' in options) {
	        value = options[type + 'Fn'](value, currentElement);
	      }
	      element[options[type + 'Key']] = value;
	    }
	    if (options.addParent) {
	      element[options.parentKey] = currentElement;
	    }
	    currentElement[options.elementsKey].push(element);
	  }
	}

	function manipulateAttributes(attributes) {
	  if ('attributesFn' in options && attributes) {
	    attributes = options.attributesFn(attributes, currentElement);
	  }
	  if ((options.trim || 'attributeValueFn' in options || 'attributeNameFn' in options || options.nativeTypeAttributes) && attributes) {
	    var key;
	    for (key in attributes) {
	      if (attributes.hasOwnProperty(key)) {
	        if (options.trim) attributes[key] = attributes[key].trim();
	        if (options.nativeTypeAttributes) {
	          attributes[key] = nativeType(attributes[key]);
	        }
	        if ('attributeValueFn' in options) attributes[key] = options.attributeValueFn(attributes[key], key, currentElement);
	        if ('attributeNameFn' in options) {
	          var temp = attributes[key];
	          delete attributes[key];
	          attributes[options.attributeNameFn(key, attributes[key], currentElement)] = temp;
	        }
	      }
	    }
	  }
	  return attributes;
	}

	function onInstruction(instruction) {
	  var attributes = {};
	  if (instruction.body && (instruction.name.toLowerCase() === 'xml' || options.instructionHasAttributes)) {
	    var attrsRegExp = /([\w:-]+)\s*=\s*(?:"([^"]*)"|'([^']*)'|(\w+))\s*/g;
	    var match;
	    while ((match = attrsRegExp.exec(instruction.body)) !== null) {
	      attributes[match[1]] = match[2] || match[3] || match[4];
	    }
	    attributes = manipulateAttributes(attributes);
	  }
	  if (instruction.name.toLowerCase() === 'xml') {
	    if (options.ignoreDeclaration) {
	      return;
	    }
	    currentElement[options.declarationKey] = {};
	    if (Object.keys(attributes).length) {
	      currentElement[options.declarationKey][options.attributesKey] = attributes;
	    }
	    if (options.addParent) {
	      currentElement[options.declarationKey][options.parentKey] = currentElement;
	    }
	  } else {
	    if (options.ignoreInstruction) {
	      return;
	    }
	    if (options.trim) {
	      instruction.body = instruction.body.trim();
	    }
	    var value = {};
	    if (options.instructionHasAttributes && Object.keys(attributes).length) {
	      value[instruction.name] = {};
	      value[instruction.name][options.attributesKey] = attributes;
	    } else {
	      value[instruction.name] = instruction.body;
	    }
	    addField('instruction', value);
	  }
	}

	function onStartElement(name, attributes) {
	  var element;
	  if (typeof name === 'object') {
	    attributes = name.attributes;
	    name = name.name;
	  }
	  attributes = manipulateAttributes(attributes);
	  if ('elementNameFn' in options) {
	    name = options.elementNameFn(name, currentElement);
	  }
	  if (options.compact) {
	    element = {};
	    if (!options.ignoreAttributes && attributes && Object.keys(attributes).length) {
	      element[options.attributesKey] = {};
	      var key;
	      for (key in attributes) {
	        if (attributes.hasOwnProperty(key)) {
	          element[options.attributesKey][key] = attributes[key];
	        }
	      }
	    }
	    if (
	      !(name in currentElement) &&
	      (isArray(options.alwaysArray) ? options.alwaysArray.indexOf(name) !== -1 : options.alwaysArray)
	    ) {
	      currentElement[name] = [];
	    }
	    if (currentElement[name] && !isArray(currentElement[name])) {
	      currentElement[name] = [currentElement[name]];
	    }
	    if (isArray(currentElement[name])) {
	      currentElement[name].push(element);
	    } else {
	      currentElement[name] = element;
	    }
	  } else {
	    if (!currentElement[options.elementsKey]) {
	      currentElement[options.elementsKey] = [];
	    }
	    element = {};
	    element[options.typeKey] = 'element';
	    element[options.nameKey] = name;
	    if (!options.ignoreAttributes && attributes && Object.keys(attributes).length) {
	      element[options.attributesKey] = attributes;
	    }
	    if (options.alwaysChildren) {
	      element[options.elementsKey] = [];
	    }
	    currentElement[options.elementsKey].push(element);
	  }
	  element[options.parentKey] = currentElement; // will be deleted in onEndElement() if !options.addParent
	  currentElement = element;
	}

	function onText(text) {
	  if (options.ignoreText) {
	    return;
	  }
	  if (!text.trim() && !options.captureSpacesBetweenElements) {
	    return;
	  }
	  if (options.trim) {
	    text = text.trim();
	  }
	  if (options.nativeType) {
	    text = nativeType(text);
	  }
	  if (options.sanitize) {
	    text = text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
	  }
	  addField('text', text);
	}

	function onComment(comment) {
	  if (options.ignoreComment) {
	    return;
	  }
	  if (options.trim) {
	    comment = comment.trim();
	  }
	  addField('comment', comment);
	}

	function onEndElement(name) {
	  var parentElement = currentElement[options.parentKey];
	  if (!options.addParent) {
	    delete currentElement[options.parentKey];
	  }
	  currentElement = parentElement;
	}

	function onCdata(cdata) {
	  if (options.ignoreCdata) {
	    return;
	  }
	  if (options.trim) {
	    cdata = cdata.trim();
	  }
	  addField('cdata', cdata);
	}

	function onDoctype(doctype) {
	  if (options.ignoreDoctype) {
	    return;
	  }
	  doctype = doctype.replace(/^ /, '');
	  if (options.trim) {
	    doctype = doctype.trim();
	  }
	  addField('doctype', doctype);
	}

	function onError(error) {
	  error.note = error; //console.error(error);
	}

	xml2js = function (xml, userOptions) {

	  var parser = sax.parser(true, {}) ;
	  var result = {};
	  currentElement = result;

	  options = validateOptions(userOptions);

	  {
	    parser.opt = {strictEntities: true};
	    parser.onopentag = onStartElement;
	    parser.ontext = onText;
	    parser.oncomment = onComment;
	    parser.onclosetag = onEndElement;
	    parser.onerror = onError;
	    parser.oncdata = onCdata;
	    parser.ondoctype = onDoctype;
	    parser.onprocessinginstruction = onInstruction;
	  }

	  {
	    parser.write(xml).close();
	  }

	  if (result[options.elementsKey]) {
	    var temp = result[options.elementsKey];
	    delete result[options.elementsKey];
	    result[options.elementsKey] = temp;
	    delete result.text;
	  }

	  return result;

	};
	return xml2js;
}

var xml2json;
var hasRequiredXml2json;

function requireXml2json () {
	if (hasRequiredXml2json) return xml2json;
	hasRequiredXml2json = 1;
	var helper = requireOptionsHelper();
	var xml2js = requireXml2js();

	function validateOptions (userOptions) {
	  var options = helper.copyOptions(userOptions);
	  helper.ensureSpacesExists(options);
	  return options;
	}

	xml2json = function(xml, userOptions) {
	  var options, js, json, parentKey;
	  options = validateOptions(userOptions);
	  js = xml2js(xml, options);
	  parentKey = 'compact' in options && options.compact ? '_parent' : 'parent';
	  // parentKey = ptions.compact ? '_parent' : 'parent'; // consider this
	  if ('addParent' in options && options.addParent) {
	    json = JSON.stringify(js, function (k, v) { return k === parentKey? '_' : v; }, options.spaces);
	  } else {
	    json = JSON.stringify(js, null, options.spaces);
	  }
	  return json.replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029');
	};
	return xml2json;
}

var js2xml;
var hasRequiredJs2xml;

function requireJs2xml () {
	if (hasRequiredJs2xml) return js2xml;
	hasRequiredJs2xml = 1;
	var helper = requireOptionsHelper();
	var isArray = requireArrayHelper().isArray;

	var currentElement, currentElementName;

	function validateOptions(userOptions) {
	  var options = helper.copyOptions(userOptions);
	  helper.ensureFlagExists('ignoreDeclaration', options);
	  helper.ensureFlagExists('ignoreInstruction', options);
	  helper.ensureFlagExists('ignoreAttributes', options);
	  helper.ensureFlagExists('ignoreText', options);
	  helper.ensureFlagExists('ignoreComment', options);
	  helper.ensureFlagExists('ignoreCdata', options);
	  helper.ensureFlagExists('ignoreDoctype', options);
	  helper.ensureFlagExists('compact', options);
	  helper.ensureFlagExists('indentText', options);
	  helper.ensureFlagExists('indentCdata', options);
	  helper.ensureFlagExists('indentAttributes', options);
	  helper.ensureFlagExists('indentInstruction', options);
	  helper.ensureFlagExists('fullTagEmptyElement', options);
	  helper.ensureFlagExists('noQuotesForNativeAttributes', options);
	  helper.ensureSpacesExists(options);
	  if (typeof options.spaces === 'number') {
	    options.spaces = Array(options.spaces + 1).join(' ');
	  }
	  helper.ensureKeyExists('declaration', options);
	  helper.ensureKeyExists('instruction', options);
	  helper.ensureKeyExists('attributes', options);
	  helper.ensureKeyExists('text', options);
	  helper.ensureKeyExists('comment', options);
	  helper.ensureKeyExists('cdata', options);
	  helper.ensureKeyExists('doctype', options);
	  helper.ensureKeyExists('type', options);
	  helper.ensureKeyExists('name', options);
	  helper.ensureKeyExists('elements', options);
	  helper.checkFnExists('doctype', options);
	  helper.checkFnExists('instruction', options);
	  helper.checkFnExists('cdata', options);
	  helper.checkFnExists('comment', options);
	  helper.checkFnExists('text', options);
	  helper.checkFnExists('instructionName', options);
	  helper.checkFnExists('elementName', options);
	  helper.checkFnExists('attributeName', options);
	  helper.checkFnExists('attributeValue', options);
	  helper.checkFnExists('attributes', options);
	  helper.checkFnExists('fullTagEmptyElement', options);
	  return options;
	}

	function writeIndentation(options, depth, firstLine) {
	  return (!firstLine && options.spaces ? '\n' : '') + Array(depth + 1).join(options.spaces);
	}

	function writeAttributes(attributes, options, depth) {
	  if (options.ignoreAttributes) {
	    return '';
	  }
	  if ('attributesFn' in options) {
	    attributes = options.attributesFn(attributes, currentElementName, currentElement);
	  }
	  var key, attr, attrName, quote, result = [];
	  for (key in attributes) {
	    if (attributes.hasOwnProperty(key) && attributes[key] !== null && attributes[key] !== undefined) {
	      quote = options.noQuotesForNativeAttributes && typeof attributes[key] !== 'string' ? '' : '"';
	      attr = '' + attributes[key]; // ensure number and boolean are converted to String
	      attr = attr.replace(/"/g, '&quot;');
	      attrName = 'attributeNameFn' in options ? options.attributeNameFn(key, attr, currentElementName, currentElement) : key;
	      result.push((options.spaces && options.indentAttributes? writeIndentation(options, depth+1, false) : ' '));
	      result.push(attrName + '=' + quote + ('attributeValueFn' in options ? options.attributeValueFn(attr, key, currentElementName, currentElement) : attr) + quote);
	    }
	  }
	  if (attributes && Object.keys(attributes).length && options.spaces && options.indentAttributes) {
	    result.push(writeIndentation(options, depth, false));
	  }
	  return result.join('');
	}

	function writeDeclaration(declaration, options, depth) {
	  currentElement = declaration;
	  currentElementName = 'xml';
	  return options.ignoreDeclaration ? '' :  '<?' + 'xml' + writeAttributes(declaration[options.attributesKey], options, depth) + '?>';
	}

	function writeInstruction(instruction, options, depth) {
	  if (options.ignoreInstruction) {
	    return '';
	  }
	  var key;
	  for (key in instruction) {
	    if (instruction.hasOwnProperty(key)) {
	      break;
	    }
	  }
	  var instructionName = 'instructionNameFn' in options ? options.instructionNameFn(key, instruction[key], currentElementName, currentElement) : key;
	  if (typeof instruction[key] === 'object') {
	    currentElement = instruction;
	    currentElementName = instructionName;
	    return '<?' + instructionName + writeAttributes(instruction[key][options.attributesKey], options, depth) + '?>';
	  } else {
	    var instructionValue = instruction[key] ? instruction[key] : '';
	    if ('instructionFn' in options) instructionValue = options.instructionFn(instructionValue, key, currentElementName, currentElement);
	    return '<?' + instructionName + (instructionValue ? ' ' + instructionValue : '') + '?>';
	  }
	}

	function writeComment(comment, options) {
	  return options.ignoreComment ? '' : '<!--' + ('commentFn' in options ? options.commentFn(comment, currentElementName, currentElement) : comment) + '-->';
	}

	function writeCdata(cdata, options) {
	  return options.ignoreCdata ? '' : '<![CDATA[' + ('cdataFn' in options ? options.cdataFn(cdata, currentElementName, currentElement) : cdata.replace(']]>', ']]]]><![CDATA[>')) + ']]>';
	}

	function writeDoctype(doctype, options) {
	  return options.ignoreDoctype ? '' : '<!DOCTYPE ' + ('doctypeFn' in options ? options.doctypeFn(doctype, currentElementName, currentElement) : doctype) + '>';
	}

	function writeText(text, options) {
	  if (options.ignoreText) return '';
	  text = '' + text; // ensure Number and Boolean are converted to String
	  text = text.replace(/&amp;/g, '&'); // desanitize to avoid double sanitization
	  text = text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
	  return 'textFn' in options ? options.textFn(text, currentElementName, currentElement) : text;
	}

	function hasContent(element, options) {
	  var i;
	  if (element.elements && element.elements.length) {
	    for (i = 0; i < element.elements.length; ++i) {
	      switch (element.elements[i][options.typeKey]) {
	      case 'text':
	        if (options.indentText) {
	          return true;
	        }
	        break; // skip to next key
	      case 'cdata':
	        if (options.indentCdata) {
	          return true;
	        }
	        break; // skip to next key
	      case 'instruction':
	        if (options.indentInstruction) {
	          return true;
	        }
	        break; // skip to next key
	      case 'doctype':
	      case 'comment':
	      case 'element':
	        return true;
	      default:
	        return true;
	      }
	    }
	  }
	  return false;
	}

	function writeElement(element, options, depth) {
	  currentElement = element;
	  currentElementName = element.name;
	  var xml = [], elementName = 'elementNameFn' in options ? options.elementNameFn(element.name, element) : element.name;
	  xml.push('<' + elementName);
	  if (element[options.attributesKey]) {
	    xml.push(writeAttributes(element[options.attributesKey], options, depth));
	  }
	  var withClosingTag = element[options.elementsKey] && element[options.elementsKey].length || element[options.attributesKey] && element[options.attributesKey]['xml:space'] === 'preserve';
	  if (!withClosingTag) {
	    if ('fullTagEmptyElementFn' in options) {
	      withClosingTag = options.fullTagEmptyElementFn(element.name, element);
	    } else {
	      withClosingTag = options.fullTagEmptyElement;
	    }
	  }
	  if (withClosingTag) {
	    xml.push('>');
	    if (element[options.elementsKey] && element[options.elementsKey].length) {
	      xml.push(writeElements(element[options.elementsKey], options, depth + 1));
	      currentElement = element;
	      currentElementName = element.name;
	    }
	    xml.push(options.spaces && hasContent(element, options) ? '\n' + Array(depth + 1).join(options.spaces) : '');
	    xml.push('</' + elementName + '>');
	  } else {
	    xml.push('/>');
	  }
	  return xml.join('');
	}

	function writeElements(elements, options, depth, firstLine) {
	  return elements.reduce(function (xml, element) {
	    var indent = writeIndentation(options, depth, firstLine && !xml);
	    switch (element.type) {
	    case 'element': return xml + indent + writeElement(element, options, depth);
	    case 'comment': return xml + indent + writeComment(element[options.commentKey], options);
	    case 'doctype': return xml + indent + writeDoctype(element[options.doctypeKey], options);
	    case 'cdata': return xml + (options.indentCdata ? indent : '') + writeCdata(element[options.cdataKey], options);
	    case 'text': return xml + (options.indentText ? indent : '') + writeText(element[options.textKey], options);
	    case 'instruction':
	      var instruction = {};
	      instruction[element[options.nameKey]] = element[options.attributesKey] ? element : element[options.instructionKey];
	      return xml + (options.indentInstruction ? indent : '') + writeInstruction(instruction, options, depth);
	    }
	  }, '');
	}

	function hasContentCompact(element, options, anyContent) {
	  var key;
	  for (key in element) {
	    if (element.hasOwnProperty(key)) {
	      switch (key) {
	      case options.parentKey:
	      case options.attributesKey:
	        break; // skip to next key
	      case options.textKey:
	        if (options.indentText || anyContent) {
	          return true;
	        }
	        break; // skip to next key
	      case options.cdataKey:
	        if (options.indentCdata || anyContent) {
	          return true;
	        }
	        break; // skip to next key
	      case options.instructionKey:
	        if (options.indentInstruction || anyContent) {
	          return true;
	        }
	        break; // skip to next key
	      case options.doctypeKey:
	      case options.commentKey:
	        return true;
	      default:
	        return true;
	      }
	    }
	  }
	  return false;
	}

	function writeElementCompact(element, name, options, depth, indent) {
	  currentElement = element;
	  currentElementName = name;
	  var elementName = 'elementNameFn' in options ? options.elementNameFn(name, element) : name;
	  if (typeof element === 'undefined' || element === null || element === '') {
	    return 'fullTagEmptyElementFn' in options && options.fullTagEmptyElementFn(name, element) || options.fullTagEmptyElement ? '<' + elementName + '></' + elementName + '>' : '<' + elementName + '/>';
	  }
	  var xml = [];
	  if (name) {
	    xml.push('<' + elementName);
	    if (typeof element !== 'object') {
	      xml.push('>' + writeText(element,options) + '</' + elementName + '>');
	      return xml.join('');
	    }
	    if (element[options.attributesKey]) {
	      xml.push(writeAttributes(element[options.attributesKey], options, depth));
	    }
	    var withClosingTag = hasContentCompact(element, options, true) || element[options.attributesKey] && element[options.attributesKey]['xml:space'] === 'preserve';
	    if (!withClosingTag) {
	      if ('fullTagEmptyElementFn' in options) {
	        withClosingTag = options.fullTagEmptyElementFn(name, element);
	      } else {
	        withClosingTag = options.fullTagEmptyElement;
	      }
	    }
	    if (withClosingTag) {
	      xml.push('>');
	    } else {
	      xml.push('/>');
	      return xml.join('');
	    }
	  }
	  xml.push(writeElementsCompact(element, options, depth + 1, false));
	  currentElement = element;
	  currentElementName = name;
	  if (name) {
	    xml.push((indent ? writeIndentation(options, depth, false) : '') + '</' + elementName + '>');
	  }
	  return xml.join('');
	}

	function writeElementsCompact(element, options, depth, firstLine) {
	  var i, key, nodes, xml = [];
	  for (key in element) {
	    if (element.hasOwnProperty(key)) {
	      nodes = isArray(element[key]) ? element[key] : [element[key]];
	      for (i = 0; i < nodes.length; ++i) {
	        switch (key) {
	        case options.declarationKey: xml.push(writeDeclaration(nodes[i], options, depth)); break;
	        case options.instructionKey: xml.push((options.indentInstruction ? writeIndentation(options, depth, firstLine) : '') + writeInstruction(nodes[i], options, depth)); break;
	        case options.attributesKey: case options.parentKey: break; // skip
	        case options.textKey: xml.push((options.indentText ? writeIndentation(options, depth, firstLine) : '') + writeText(nodes[i], options)); break;
	        case options.cdataKey: xml.push((options.indentCdata ? writeIndentation(options, depth, firstLine) : '') + writeCdata(nodes[i], options)); break;
	        case options.doctypeKey: xml.push(writeIndentation(options, depth, firstLine) + writeDoctype(nodes[i], options)); break;
	        case options.commentKey: xml.push(writeIndentation(options, depth, firstLine) + writeComment(nodes[i], options)); break;
	        default: xml.push(writeIndentation(options, depth, firstLine) + writeElementCompact(nodes[i], key, options, depth, hasContentCompact(nodes[i], options)));
	        }
	        firstLine = firstLine && !xml.length;
	      }
	    }
	  }
	  return xml.join('');
	}

	js2xml = function (js, options) {
	  options = validateOptions(options);
	  var xml = [];
	  currentElement = js;
	  currentElementName = '_root_';
	  if (options.compact) {
	    xml.push(writeElementsCompact(js, options, 0, true));
	  } else {
	    if (js[options.declarationKey]) {
	      xml.push(writeDeclaration(js[options.declarationKey], options, 0));
	    }
	    if (js[options.elementsKey] && js[options.elementsKey].length) {
	      xml.push(writeElements(js[options.elementsKey], options, 0, !xml.length));
	    }
	  }
	  return xml.join('');
	};
	return js2xml;
}

var json2xml;
var hasRequiredJson2xml;

function requireJson2xml () {
	if (hasRequiredJson2xml) return json2xml;
	hasRequiredJson2xml = 1;
	var js2xml = requireJs2xml();

	json2xml = function (json, options) {
	  if (json instanceof Buffer) {
	    json = json.toString();
	  }
	  var js = null;
	  if (typeof (json) === 'string') {
	    try {
	      js = JSON.parse(json);
	    } catch (e) {
	      throw new Error('The JSON structure is invalid');
	    }
	  } else {
	    js = json;
	  }
	  return js2xml(js, options);
	};
	return json2xml;
}

/*jslint node:true */

var lib;
var hasRequiredLib;

function requireLib () {
	if (hasRequiredLib) return lib;
	hasRequiredLib = 1;
	var xml2js = requireXml2js();
	var xml2json = requireXml2json();
	var js2xml = requireJs2xml();
	var json2xml = requireJson2xml();

	lib = {
	  xml2js: xml2js,
	  xml2json: xml2json,
	  js2xml: js2xml,
	  json2xml: json2xml
	};
	return lib;
}

var libExports = requireLib();
var convert = /*@__PURE__*/getDefaultExportFromCjs(libExports);

const camelCase = (str) => str.replace(/([-_]\w)/g, (g) => g[1].toUpperCase());

const nativeType = (value) => {
    const nValue = Number(value);
    if (!Number.isNaN(nValue)) {
        return nValue;
    }
    const bValue = value.toLowerCase();
    if (bValue === 'true') {
        return true;
    }
    if (bValue === 'false') {
        return false;
    }
    return value;
};

const urlEquals = (urlA, urlB) => {
    if (!urlA && !urlB) {
        return true;
    }
    if (!urlA || !urlB) {
        return false;
    }
    const trimmedUrlA = urlA.trim();
    const trimmedUrlB = urlB.trim();
    if (Math.abs(trimmedUrlA.length - trimmedUrlB.length) > 1) {
        return false;
    }
    const strippedUrlA = trimmedUrlA.slice(-1) === '/' ? trimmedUrlA.slice(0, -1) : trimmedUrlA;
    const strippedUrlB = trimmedUrlB.slice(-1) === '/' ? trimmedUrlB.slice(0, -1) : trimmedUrlB;
    return urlA.includes(strippedUrlB) || urlB.includes(strippedUrlA);
};
const urlContains = (urlA, urlB) => {
    if (!urlA && !urlB) {
        return true;
    }
    if (!urlA || !urlB) {
        return false;
    }
    const trimmedUrlA = urlA.trim();
    const trimmedUrlB = urlB.trim();
    const strippedUrlA = trimmedUrlA.slice(-1) === '/' ? trimmedUrlA.slice(0, -1) : trimmedUrlA;
    const strippedUrlB = trimmedUrlB.slice(-1) === '/' ? trimmedUrlB.slice(0, -1) : trimmedUrlB;
    return urlA.includes(strippedUrlB) || urlB.includes(strippedUrlA);
};
const getDAVAttribute = (nsArr) => nsArr.reduce((prev, curr) => ({ ...prev, [DAVAttributeMap[curr]]: curr }), {});
const cleanupFalsy = (obj) => Object.entries(obj).reduce((prev, [key, value]) => {
    if (value)
        return { ...prev, [key]: value };
    return prev;
}, {});
const conditionalParam = (key, param) => {
    if (param) {
        return {
            [key]: param,
        };
    }
    return {};
};
const excludeHeaders = (headers, headersToExclude) => {
    if (!headers) {
        return {};
    }
    if (!headersToExclude || headersToExclude.length === 0) {
        return headers;
    }
    return Object.fromEntries(Object.entries(headers).filter(([key]) => !headersToExclude.includes(key)));
};

var requestHelpers = /*#__PURE__*/Object.freeze({
	__proto__: null,
	cleanupFalsy: cleanupFalsy,
	conditionalParam: conditionalParam,
	excludeHeaders: excludeHeaders,
	getDAVAttribute: getDAVAttribute,
	urlContains: urlContains,
	urlEquals: urlEquals
});

const debug$5 = getLogger('tsdav:request');
const davRequest = async (params) => {
    var _a;
    const { url, init, convertIncoming = true, parseOutgoing = true } = params;
    const { headers = {}, body, namespace, method, attributes } = init;
    const xmlBody = convertIncoming
        ? convert.js2xml({
            _declaration: { _attributes: { version: '1.0', encoding: 'utf-8' } },
            ...body,
            _attributes: attributes,
        }, {
            compact: true,
            spaces: 2,
            elementNameFn: (name) => {
                // add namespace to all keys without namespace
                if (namespace && !/^.+:.+/.test(name)) {
                    return `${namespace}:${name}`;
                }
                return name;
            },
        })
        : body;
    // debug('outgoing xml:');
    // debug(`${method} ${url}`);
    // debug(
    //   `headers: ${JSON.stringify(
    //     {
    //       'Content-Type': 'text/xml;charset=UTF-8',
    //       ...cleanupFalsy(headers),
    //     },
    //     null,
    //     2
    //   )}`
    // );
    // debug(xmlBody);
    const davResponse = await browserPonyfillExports.fetch(url, {
        headers: {
            'Content-Type': 'text/xml;charset=UTF-8',
            ...cleanupFalsy(headers),
        },
        body: xmlBody,
        method,
    });
    const resText = await davResponse.text();
    // filter out invalid responses
    // debug('response xml:');
    // debug(resText);
    // debug(davResponse);
    if (!davResponse.ok ||
        !((_a = davResponse.headers.get('content-type')) === null || _a === void 0 ? void 0 : _a.includes('xml')) ||
        !parseOutgoing) {
        return [
            {
                href: davResponse.url,
                ok: davResponse.ok,
                status: davResponse.status,
                statusText: davResponse.statusText,
                raw: resText,
            },
        ];
    }
    const result = convert.xml2js(resText, {
        compact: true,
        trim: true,
        textFn: (value, parentElement) => {
            try {
                // This is needed for xml-js design reasons
                const parentOfParent = parentElement._parent;
                const pOpKeys = Object.keys(parentOfParent);
                const keyNo = pOpKeys.length;
                const keyName = pOpKeys[keyNo - 1];
                const arrOfKey = parentOfParent[keyName];
                const arrOfKeyLen = arrOfKey.length;
                if (arrOfKeyLen > 0) {
                    const arr = arrOfKey;
                    const arrIndex = arrOfKey.length - 1;
                    arr[arrIndex] = nativeType(value);
                }
                else {
                    parentOfParent[keyName] = nativeType(value);
                }
            }
            catch (e) {
                debug$5(e.stack);
            }
        },
        // remove namespace & camelCase
        elementNameFn: (attributeName) => camelCase(attributeName.replace(/^.+:/, '')),
        attributesFn: (value) => {
            const newVal = { ...value };
            delete newVal.xmlns;
            return newVal;
        },
        ignoreDeclaration: true,
    });
    const responseBodies = Array.isArray(result.multistatus.response)
        ? result.multistatus.response
        : [result.multistatus.response];
    return responseBodies.map((responseBody) => {
        var _a, _b;
        const statusRegex = /^\S+\s(?<status>\d+)\s(?<statusText>.+)$/;
        if (!responseBody) {
            return {
                status: davResponse.status,
                statusText: davResponse.statusText,
                ok: davResponse.ok,
            };
        }
        const matchArr = statusRegex.exec(responseBody.status);
        return {
            raw: result,
            href: responseBody.href,
            status: (matchArr === null || matchArr === void 0 ? void 0 : matchArr.groups) ? Number.parseInt(matchArr === null || matchArr === void 0 ? void 0 : matchArr.groups.status, 10) : davResponse.status,
            statusText: (_b = (_a = matchArr === null || matchArr === void 0 ? void 0 : matchArr.groups) === null || _a === void 0 ? void 0 : _a.statusText) !== null && _b !== void 0 ? _b : davResponse.statusText,
            ok: !responseBody.error,
            error: responseBody.error,
            responsedescription: responseBody.responsedescription,
            props: (Array.isArray(responseBody.propstat)
                ? responseBody.propstat
                : [responseBody.propstat]).reduce((prev, curr) => {
                return {
                    ...prev,
                    ...curr === null || curr === void 0 ? void 0 : curr.prop,
                };
            }, {}),
        };
    });
};
const propfind = async (params) => {
    const { url, props, depth, headers, headersToExclude } = params;
    return davRequest({
        url,
        init: {
            method: 'PROPFIND',
            headers: excludeHeaders(cleanupFalsy({ depth, ...headers }), headersToExclude),
            namespace: DAVNamespaceShort.DAV,
            body: {
                propfind: {
                    _attributes: getDAVAttribute([
                        DAVNamespace.CALDAV,
                        DAVNamespace.CALDAV_APPLE,
                        DAVNamespace.CALENDAR_SERVER,
                        DAVNamespace.CARDDAV,
                        DAVNamespace.DAV,
                    ]),
                    prop: props,
                },
            },
        },
    });
};
const createObject = async (params) => {
    const { url, data, headers, headersToExclude } = params;
    return browserPonyfillExports.fetch(url, {
        method: 'PUT',
        body: data,
        headers: excludeHeaders(headers, headersToExclude),
    });
};
const updateObject = async (params) => {
    const { url, data, etag, headers, headersToExclude } = params;
    return browserPonyfillExports.fetch(url, {
        method: 'PUT',
        body: data,
        headers: excludeHeaders(cleanupFalsy({ 'If-Match': etag, ...headers }), headersToExclude),
    });
};
const deleteObject = async (params) => {
    const { url, headers, etag, headersToExclude } = params;
    return browserPonyfillExports.fetch(url, {
        method: 'DELETE',
        headers: excludeHeaders(cleanupFalsy({ 'If-Match': etag, ...headers }), headersToExclude),
    });
};

var request = /*#__PURE__*/Object.freeze({
	__proto__: null,
	createObject: createObject,
	davRequest: davRequest,
	deleteObject: deleteObject,
	propfind: propfind,
	updateObject: updateObject
});

function hasFields(obj, fields) {
    const inObj = (object) => fields.every((f) => object[f]);
    if (Array.isArray(obj)) {
        return obj.every((o) => inObj(o));
    }
    return inObj(obj);
}
const findMissingFieldNames = (obj, fields) => fields.reduce((prev, curr) => (obj[curr] ? prev : `${prev.length ? `${prev},` : ''}${curr.toString()}`), '');

const debug$4 = getLogger('tsdav:collection');
const collectionQuery = async (params) => {
    const { url, body, depth, defaultNamespace = DAVNamespaceShort.DAV, headers, headersToExclude, } = params;
    const queryResults = await davRequest({
        url,
        init: {
            method: 'REPORT',
            headers: excludeHeaders(cleanupFalsy({ depth, ...headers }), headersToExclude),
            namespace: defaultNamespace,
            body,
        },
    });
    // empty query result
    if (queryResults.length === 1 && !queryResults[0].raw) {
        return [];
    }
    return queryResults;
};
const makeCollection = async (params) => {
    const { url, props, depth, headers, headersToExclude } = params;
    return davRequest({
        url,
        init: {
            method: 'MKCOL',
            headers: excludeHeaders(cleanupFalsy({ depth, ...headers }), headersToExclude),
            namespace: DAVNamespaceShort.DAV,
            body: props
                ? {
                    mkcol: {
                        set: {
                            prop: props,
                        },
                    },
                }
                : undefined,
        },
    });
};
const supportedReportSet = async (params) => {
    var _a, _b, _c, _d, _e;
    const { collection, headers, headersToExclude } = params;
    const res = await propfind({
        url: collection.url,
        props: {
            [`${DAVNamespaceShort.DAV}:supported-report-set`]: {},
        },
        depth: '0',
        headers: excludeHeaders(headers, headersToExclude),
    });
    return ((_e = (_d = (_c = (_b = (_a = res[0]) === null || _a === void 0 ? void 0 : _a.props) === null || _b === void 0 ? void 0 : _b.supportedReportSet) === null || _c === void 0 ? void 0 : _c.supportedReport) === null || _d === void 0 ? void 0 : _d.map((sr) => Object.keys(sr.report)[0])) !== null && _e !== void 0 ? _e : []);
};
const isCollectionDirty = async (params) => {
    var _a, _b, _c;
    const { collection, headers, headersToExclude } = params;
    const responses = await propfind({
        url: collection.url,
        props: {
            [`${DAVNamespaceShort.CALENDAR_SERVER}:getctag`]: {},
        },
        depth: '0',
        headers: excludeHeaders(headers, headersToExclude),
    });
    const res = responses.filter((r) => urlContains(collection.url, r.href))[0];
    if (!res) {
        throw new Error('Collection does not exist on server');
    }
    return {
        isDirty: collection.ctag !== ((_a = res.props) === null || _a === void 0 ? void 0 : _a.getctag),
        newCtag: (_c = (_b = res.props) === null || _b === void 0 ? void 0 : _b.getctag) === null || _c === void 0 ? void 0 : _c.toString(),
    };
};
/**
 * This is for webdav sync-collection only
 */
const syncCollection = (params) => {
    const { url, props, headers, syncLevel, syncToken, headersToExclude } = params;
    return davRequest({
        url,
        init: {
            method: 'REPORT',
            namespace: DAVNamespaceShort.DAV,
            headers: excludeHeaders({ ...headers }, headersToExclude),
            body: {
                'sync-collection': {
                    _attributes: getDAVAttribute([
                        DAVNamespace.CALDAV,
                        DAVNamespace.CARDDAV,
                        DAVNamespace.DAV,
                    ]),
                    'sync-level': syncLevel,
                    'sync-token': syncToken,
                    [`${DAVNamespaceShort.DAV}:prop`]: props,
                },
            },
        },
    });
};
/** remote collection to local */
const smartCollectionSync = async (params) => {
    var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l;
    const { collection, method, headers, headersToExclude, account, detailedResult } = params;
    const requiredFields = ['accountType', 'homeUrl'];
    if (!account || !hasFields(account, requiredFields)) {
        if (!account) {
            throw new Error('no account for smartCollectionSync');
        }
        throw new Error(`account must have ${findMissingFieldNames(account, requiredFields)} before smartCollectionSync`);
    }
    const syncMethod = method !== null && method !== void 0 ? method : (((_a = collection.reports) === null || _a === void 0 ? void 0 : _a.includes('syncCollection')) ? 'webdav' : 'basic');
    debug$4(`smart collection sync with type ${account.accountType} and method ${syncMethod}`);
    if (syncMethod === 'webdav') {
        const result = await syncCollection({
            url: collection.url,
            props: {
                [`${DAVNamespaceShort.DAV}:getetag`]: {},
                [`${account.accountType === 'caldav' ? DAVNamespaceShort.CALDAV : DAVNamespaceShort.CARDDAV}:${account.accountType === 'caldav' ? 'calendar-data' : 'address-data'}`]: {},
                [`${DAVNamespaceShort.DAV}:displayname`]: {},
            },
            syncLevel: 1,
            syncToken: collection.syncToken,
            headers: excludeHeaders(headers, headersToExclude),
        });
        const objectResponses = result.filter((r) => {
            var _a;
            const extName = account.accountType === 'caldav' ? '.ics' : '.vcf';
            return ((_a = r.href) === null || _a === void 0 ? void 0 : _a.slice(-4)) === extName;
        });
        const changedObjectUrls = objectResponses.filter((o) => o.status !== 404).map((r) => r.href);
        const deletedObjectUrls = objectResponses.filter((o) => o.status === 404).map((r) => r.href);
        const multiGetObjectResponse = changedObjectUrls.length
            ? ((_c = (await ((_b = collection === null || collection === void 0 ? void 0 : collection.objectMultiGet) === null || _b === void 0 ? void 0 : _b.call(collection, {
                url: collection.url,
                props: {
                    [`${DAVNamespaceShort.DAV}:getetag`]: {},
                    [`${account.accountType === 'caldav'
                        ? DAVNamespaceShort.CALDAV
                        : DAVNamespaceShort.CARDDAV}:${account.accountType === 'caldav' ? 'calendar-data' : 'address-data'}`]: {},
                },
                objectUrls: changedObjectUrls,
                depth: '1',
                headers: excludeHeaders(headers, headersToExclude),
            })))) !== null && _c !== void 0 ? _c : [])
            : [];
        const remoteObjects = multiGetObjectResponse.map((res) => {
            var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k;
            return {
                url: (_a = res.href) !== null && _a !== void 0 ? _a : '',
                etag: (_b = res.props) === null || _b === void 0 ? void 0 : _b.getetag,
                data: (account === null || account === void 0 ? void 0 : account.accountType) === 'caldav'
                    ? ((_e = (_d = (_c = res.props) === null || _c === void 0 ? void 0 : _c.calendarData) === null || _d === void 0 ? void 0 : _d._cdata) !== null && _e !== void 0 ? _e : (_f = res.props) === null || _f === void 0 ? void 0 : _f.calendarData)
                    : ((_j = (_h = (_g = res.props) === null || _g === void 0 ? void 0 : _g.addressData) === null || _h === void 0 ? void 0 : _h._cdata) !== null && _j !== void 0 ? _j : (_k = res.props) === null || _k === void 0 ? void 0 : _k.addressData),
            };
        });
        const localObjects = (_d = collection.objects) !== null && _d !== void 0 ? _d : [];
        // no existing url
        const created = remoteObjects.filter((o) => localObjects.every((lo) => !urlContains(lo.url, o.url)));
        // debug(`created objects: ${created.map((o) => o.url).join('\n')}`);
        // have same url, but etag different
        const updated = localObjects.reduce((prev, curr) => {
            const found = remoteObjects.find((ro) => urlContains(ro.url, curr.url));
            if (found && found.etag && found.etag !== curr.etag) {
                return [...prev, found];
            }
            return prev;
        }, []);
        // debug(`updated objects: ${updated.map((o) => o.url).join('\n')}`);
        const deleted = deletedObjectUrls.map((o) => ({
            url: o,
            etag: '',
        }));
        // debug(`deleted objects: ${deleted.map((o) => o.url).join('\n')}`);
        const unchanged = localObjects.filter((lo) => remoteObjects.some((ro) => urlContains(lo.url, ro.url) && ro.etag === lo.etag));
        return {
            ...collection,
            objects: detailedResult
                ? { created, updated, deleted }
                : [...unchanged, ...created, ...updated],
            // all syncToken in the results are the same so we use the first one here
            syncToken: (_h = (_g = (_f = (_e = result[0]) === null || _e === void 0 ? void 0 : _e.raw) === null || _f === void 0 ? void 0 : _f.multistatus) === null || _g === void 0 ? void 0 : _g.syncToken) !== null && _h !== void 0 ? _h : collection.syncToken,
        };
    }
    if (syncMethod === 'basic') {
        const { isDirty, newCtag } = await isCollectionDirty({
            collection,
            headers: excludeHeaders(headers, headersToExclude),
        });
        const localObjects = (_j = collection.objects) !== null && _j !== void 0 ? _j : [];
        const remoteObjects = (_l = (await ((_k = collection.fetchObjects) === null || _k === void 0 ? void 0 : _k.call(collection, {
            collection,
            headers: excludeHeaders(headers, headersToExclude),
        })))) !== null && _l !== void 0 ? _l : [];
        // no existing url
        const created = remoteObjects.filter((ro) => localObjects.every((lo) => !urlContains(lo.url, ro.url)));
        // debug(`created objects: ${created.map((o) => o.url).join('\n')}`);
        // have same url, but etag different
        const updated = localObjects.reduce((prev, curr) => {
            const found = remoteObjects.find((ro) => urlContains(ro.url, curr.url));
            if (found && found.etag && found.etag !== curr.etag) {
                return [...prev, found];
            }
            return prev;
        }, []);
        // debug(`updated objects: ${updated.map((o) => o.url).join('\n')}`);
        // does not present in remote
        const deleted = localObjects.filter((cal) => remoteObjects.every((ro) => !urlContains(ro.url, cal.url)));
        // debug(`deleted objects: ${deleted.map((o) => o.url).join('\n')}`);
        const unchanged = localObjects.filter((lo) => remoteObjects.some((ro) => urlContains(lo.url, ro.url) && ro.etag === lo.etag));
        if (isDirty) {
            return {
                ...collection,
                objects: detailedResult
                    ? { created, updated, deleted }
                    : [...unchanged, ...created, ...updated],
                ctag: newCtag,
            };
        }
    }
    return detailedResult
        ? {
            ...collection,
            objects: {
                created: [],
                updated: [],
                deleted: [],
            },
        }
        : collection;
};

var collection = /*#__PURE__*/Object.freeze({
	__proto__: null,
	collectionQuery: collectionQuery,
	isCollectionDirty: isCollectionDirty,
	makeCollection: makeCollection,
	smartCollectionSync: smartCollectionSync,
	supportedReportSet: supportedReportSet,
	syncCollection: syncCollection
});

const debug$3 = getLogger('tsdav:addressBook');
const addressBookQuery = async (params) => {
    const { url, props, filters, depth, headers, headersToExclude } = params;
    return collectionQuery({
        url,
        body: {
            'addressbook-query': {
                _attributes: getDAVAttribute([DAVNamespace.CARDDAV, DAVNamespace.DAV]),
                [`${DAVNamespaceShort.DAV}:prop`]: props,
                filter: filters !== null && filters !== void 0 ? filters : {
                    'prop-filter': {
                        _attributes: {
                            name: 'FN',
                        },
                    },
                },
            },
        },
        defaultNamespace: DAVNamespaceShort.CARDDAV,
        depth,
        headers: excludeHeaders(headers, headersToExclude),
    });
};
const addressBookMultiGet = async (params) => {
    const { url, props, objectUrls, depth, headers } = params;
    return collectionQuery({
        url,
        body: {
            'addressbook-multiget': {
                _attributes: getDAVAttribute([DAVNamespace.DAV, DAVNamespace.CARDDAV]),
                [`${DAVNamespaceShort.DAV}:prop`]: props,
                [`${DAVNamespaceShort.DAV}:href`]: objectUrls,
            },
        },
        defaultNamespace: DAVNamespaceShort.CARDDAV,
        depth,
        headers,
    });
};
const fetchAddressBooks = async (params) => {
    const { account, headers, props: customProps, headersToExclude } = params !== null && params !== void 0 ? params : {};
    const requiredFields = ['homeUrl', 'rootUrl'];
    if (!account || !hasFields(account, requiredFields)) {
        if (!account) {
            throw new Error('no account for fetchAddressBooks');
        }
        throw new Error(`account must have ${findMissingFieldNames(account, requiredFields)} before fetchAddressBooks`);
    }
    const res = await propfind({
        url: account.homeUrl,
        props: customProps !== null && customProps !== void 0 ? customProps : {
            [`${DAVNamespaceShort.DAV}:displayname`]: {},
            [`${DAVNamespaceShort.CALENDAR_SERVER}:getctag`]: {},
            [`${DAVNamespaceShort.DAV}:resourcetype`]: {},
            [`${DAVNamespaceShort.DAV}:sync-token`]: {},
        },
        depth: '1',
        headers: excludeHeaders(headers, headersToExclude),
    });
    return Promise.all(res
        .filter((r) => { var _a, _b; return Object.keys((_b = (_a = r.props) === null || _a === void 0 ? void 0 : _a.resourcetype) !== null && _b !== void 0 ? _b : {}).includes('addressbook'); })
        .map((rs) => {
        var _a, _b, _c, _d, _e, _f, _g, _h, _j;
        const displayName = (_c = (_b = (_a = rs.props) === null || _a === void 0 ? void 0 : _a.displayname) === null || _b === void 0 ? void 0 : _b._cdata) !== null && _c !== void 0 ? _c : (_d = rs.props) === null || _d === void 0 ? void 0 : _d.displayname;
        debug$3(`Found address book named ${typeof displayName === 'string' ? displayName : ''},
             props: ${JSON.stringify(rs.props)}`);
        return {
            url: new URL((_e = rs.href) !== null && _e !== void 0 ? _e : '', (_f = account.rootUrl) !== null && _f !== void 0 ? _f : '').href,
            ctag: (_g = rs.props) === null || _g === void 0 ? void 0 : _g.getctag,
            displayName: typeof displayName === 'string' ? displayName : '',
            resourcetype: Object.keys((_h = rs.props) === null || _h === void 0 ? void 0 : _h.resourcetype),
            syncToken: (_j = rs.props) === null || _j === void 0 ? void 0 : _j.syncToken,
        };
    })
        .map(async (addr) => ({
        ...addr,
        reports: await supportedReportSet({ collection: addr, headers }),
    })));
};
const fetchVCards = async (params) => {
    const { addressBook, headers, objectUrls, headersToExclude, urlFilter = (url) => url, useMultiGet = true, } = params;
    debug$3(`Fetching vcards from ${addressBook === null || addressBook === void 0 ? void 0 : addressBook.url}`);
    const requiredFields = ['url'];
    if (!addressBook || !hasFields(addressBook, requiredFields)) {
        if (!addressBook) {
            throw new Error('cannot fetchVCards for undefined addressBook');
        }
        throw new Error(`addressBook must have ${findMissingFieldNames(addressBook, requiredFields)} before fetchVCards`);
    }
    const vcardUrls = (objectUrls !== null && objectUrls !== void 0 ? objectUrls : 
    // fetch all objects of the calendar
    (await addressBookQuery({
        url: addressBook.url,
        props: { [`${DAVNamespaceShort.DAV}:getetag`]: {} },
        depth: '1',
        headers: excludeHeaders(headers, headersToExclude),
    })).map((res) => { var _a; return (res.ok ? ((_a = res.href) !== null && _a !== void 0 ? _a : '') : ''); }))
        .map((url) => (url.startsWith('http') || !url ? url : new URL(url, addressBook.url).href))
        .filter(urlFilter)
        .map((url) => new URL(url).pathname);
    let vCardResults = [];
    if (vcardUrls.length > 0) {
        if (useMultiGet) {
            vCardResults = await addressBookMultiGet({
                url: addressBook.url,
                props: {
                    [`${DAVNamespaceShort.DAV}:getetag`]: {},
                    [`${DAVNamespaceShort.CARDDAV}:address-data`]: {},
                },
                objectUrls: vcardUrls,
                depth: '1',
                headers: excludeHeaders(headers, headersToExclude),
            });
        }
        else {
            vCardResults = await addressBookQuery({
                url: addressBook.url,
                props: {
                    [`${DAVNamespaceShort.DAV}:getetag`]: {},
                    [`${DAVNamespaceShort.CARDDAV}:address-data`]: {},
                },
                depth: '1',
                headers: excludeHeaders(headers, headersToExclude),
            });
        }
    }
    return vCardResults.map((res) => {
        var _a, _b, _c, _d, _e, _f;
        return ({
            url: new URL((_a = res.href) !== null && _a !== void 0 ? _a : '', addressBook.url).href,
            etag: (_b = res.props) === null || _b === void 0 ? void 0 : _b.getetag,
            data: (_e = (_d = (_c = res.props) === null || _c === void 0 ? void 0 : _c.addressData) === null || _d === void 0 ? void 0 : _d._cdata) !== null && _e !== void 0 ? _e : (_f = res.props) === null || _f === void 0 ? void 0 : _f.addressData,
        });
    });
};
const createVCard = async (params) => {
    const { addressBook, vCardString, filename, headers, headersToExclude } = params;
    return createObject({
        url: new URL(filename, addressBook.url).href,
        data: vCardString,
        headers: excludeHeaders({
            'content-type': 'text/vcard; charset=utf-8',
            'If-None-Match': '*',
            ...headers,
        }, headersToExclude),
    });
};
const updateVCard = async (params) => {
    const { vCard, headers, headersToExclude } = params;
    return updateObject({
        url: vCard.url,
        data: vCard.data,
        etag: vCard.etag,
        headers: excludeHeaders({
            'content-type': 'text/vcard; charset=utf-8',
            ...headers,
        }, headersToExclude),
    });
};
const deleteVCard = async (params) => {
    const { vCard, headers, headersToExclude } = params;
    return deleteObject({
        url: vCard.url,
        etag: vCard.etag,
        headers: excludeHeaders(headers, headersToExclude),
    });
};

var addressBook = /*#__PURE__*/Object.freeze({
	__proto__: null,
	addressBookMultiGet: addressBookMultiGet,
	addressBookQuery: addressBookQuery,
	createVCard: createVCard,
	deleteVCard: deleteVCard,
	fetchAddressBooks: fetchAddressBooks,
	fetchVCards: fetchVCards,
	updateVCard: updateVCard
});

const debug$2 = getLogger('tsdav:calendar');
const calendarQuery = async (params) => {
    const { url, props, filters, timezone, depth, headers, headersToExclude } = params;
    return collectionQuery({
        url,
        body: {
            'calendar-query': cleanupFalsy({
                _attributes: getDAVAttribute([
                    DAVNamespace.CALDAV,
                    DAVNamespace.CALENDAR_SERVER,
                    DAVNamespace.CALDAV_APPLE,
                    DAVNamespace.DAV,
                ]),
                [`${DAVNamespaceShort.DAV}:prop`]: props,
                filter: filters,
                timezone,
            }),
        },
        defaultNamespace: DAVNamespaceShort.CALDAV,
        depth,
        headers: excludeHeaders(headers, headersToExclude),
    });
};
const calendarMultiGet = async (params) => {
    const { url, props, objectUrls, filters, timezone, depth, headers, headersToExclude } = params;
    return collectionQuery({
        url,
        body: {
            'calendar-multiget': {
                _attributes: getDAVAttribute([DAVNamespace.DAV, DAVNamespace.CALDAV]),
                [`${DAVNamespaceShort.DAV}:prop`]: props,
                [`${DAVNamespaceShort.DAV}:href`]: objectUrls,
                ...conditionalParam('filter', filters),
                timezone,
            },
        },
        defaultNamespace: DAVNamespaceShort.CALDAV,
        depth,
        headers: excludeHeaders(headers, headersToExclude),
    });
};
const makeCalendar = async (params) => {
    const { url, props, depth, headers, headersToExclude } = params;
    return davRequest({
        url,
        init: {
            method: 'MKCALENDAR',
            headers: excludeHeaders(cleanupFalsy({ depth, ...headers }), headersToExclude),
            namespace: DAVNamespaceShort.DAV,
            body: {
                [`${DAVNamespaceShort.CALDAV}:mkcalendar`]: {
                    _attributes: getDAVAttribute([
                        DAVNamespace.DAV,
                        DAVNamespace.CALDAV,
                        DAVNamespace.CALDAV_APPLE,
                    ]),
                    set: {
                        prop: props,
                    },
                },
            },
        },
    });
};
const fetchCalendars = async (params) => {
    const { headers, account, props: customProps, projectedProps, headersToExclude } = params !== null && params !== void 0 ? params : {};
    const requiredFields = ['homeUrl', 'rootUrl'];
    if (!account || !hasFields(account, requiredFields)) {
        if (!account) {
            throw new Error('no account for fetchCalendars');
        }
        throw new Error(`account must have ${findMissingFieldNames(account, requiredFields)} before fetchCalendars`);
    }
    const res = await propfind({
        url: account.homeUrl,
        props: customProps !== null && customProps !== void 0 ? customProps : {
            [`${DAVNamespaceShort.CALDAV}:calendar-description`]: {},
            [`${DAVNamespaceShort.CALDAV}:calendar-timezone`]: {},
            [`${DAVNamespaceShort.DAV}:displayname`]: {},
            [`${DAVNamespaceShort.CALDAV_APPLE}:calendar-color`]: {},
            [`${DAVNamespaceShort.CALENDAR_SERVER}:getctag`]: {},
            [`${DAVNamespaceShort.DAV}:resourcetype`]: {},
            [`${DAVNamespaceShort.CALDAV}:supported-calendar-component-set`]: {},
            [`${DAVNamespaceShort.DAV}:sync-token`]: {},
        },
        depth: '1',
        headers: excludeHeaders(headers, headersToExclude),
    });
    return Promise.all(res
        .filter((r) => { var _a, _b; return Object.keys((_b = (_a = r.props) === null || _a === void 0 ? void 0 : _a.resourcetype) !== null && _b !== void 0 ? _b : {}).includes('calendar'); })
        .filter((rc) => {
        var _a, _b, _c, _d;
        // filter out none iCal format calendars.
        const components = (Array.isArray((_a = rc.props) === null || _a === void 0 ? void 0 : _a.supportedCalendarComponentSet.comp)
            ? (_b = rc.props) === null || _b === void 0 ? void 0 : _b.supportedCalendarComponentSet.comp.map((sc) => sc._attributes.name)
            : [(_d = (_c = rc.props) === null || _c === void 0 ? void 0 : _c.supportedCalendarComponentSet.comp) === null || _d === void 0 ? void 0 : _d._attributes.name]) || [];
        return components.some((c) => Object.values(ICALObjects).includes(c));
    })
        .map((rs) => {
        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r;
        // debug(`Found calendar ${rs.props?.displayname}`);
        const description = (_a = rs.props) === null || _a === void 0 ? void 0 : _a.calendarDescription;
        const timezone = (_b = rs.props) === null || _b === void 0 ? void 0 : _b.calendarTimezone;
        return {
            description: typeof description === 'string' ? description : '',
            timezone: typeof timezone === 'string' ? timezone : '',
            url: new URL((_c = rs.href) !== null && _c !== void 0 ? _c : '', (_d = account.rootUrl) !== null && _d !== void 0 ? _d : '').href,
            ctag: (_e = rs.props) === null || _e === void 0 ? void 0 : _e.getctag,
            calendarColor: (_f = rs.props) === null || _f === void 0 ? void 0 : _f.calendarColor,
            displayName: (_h = (_g = rs.props) === null || _g === void 0 ? void 0 : _g.displayname._cdata) !== null && _h !== void 0 ? _h : (_j = rs.props) === null || _j === void 0 ? void 0 : _j.displayname,
            components: Array.isArray((_k = rs.props) === null || _k === void 0 ? void 0 : _k.supportedCalendarComponentSet.comp)
                ? (_l = rs.props) === null || _l === void 0 ? void 0 : _l.supportedCalendarComponentSet.comp.map((sc) => sc._attributes.name)
                : [(_o = (_m = rs.props) === null || _m === void 0 ? void 0 : _m.supportedCalendarComponentSet.comp) === null || _o === void 0 ? void 0 : _o._attributes.name],
            resourcetype: Object.keys((_p = rs.props) === null || _p === void 0 ? void 0 : _p.resourcetype),
            syncToken: (_q = rs.props) === null || _q === void 0 ? void 0 : _q.syncToken,
            ...conditionalParam('projectedProps', Object.fromEntries(Object.entries((_r = rs.props) !== null && _r !== void 0 ? _r : {}).filter(([key]) => projectedProps === null || projectedProps === void 0 ? void 0 : projectedProps[key]))),
        };
    })
        .map(async (cal) => ({
        ...cal,
        reports: await supportedReportSet({
            collection: cal,
            headers: excludeHeaders(headers, headersToExclude),
        }),
    })));
};
const fetchCalendarObjects = async (params) => {
    const { calendar, objectUrls, filters: customFilters, timeRange, headers, expand, urlFilter = (url) => Boolean(url === null || url === void 0 ? void 0 : url.includes('.ics')), useMultiGet = true, headersToExclude, } = params;
    if (timeRange) {
        // validate timeRange
        const ISO_8601 = /^\d{4}(-\d\d(-\d\d(T\d\d:\d\d(:\d\d)?(\.\d+)?(([+-]\d\d:\d\d)|Z)?)?)?)?$/i;
        const ISO_8601_FULL = /^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d(\.\d+)?(([+-]\d\d:\d\d)|Z)?$/i;
        if ((!ISO_8601.test(timeRange.start) || !ISO_8601.test(timeRange.end)) &&
            (!ISO_8601_FULL.test(timeRange.start) || !ISO_8601_FULL.test(timeRange.end))) {
            throw new Error('invalid timeRange format, not in ISO8601');
        }
    }
    debug$2(`Fetching calendar objects from ${calendar === null || calendar === void 0 ? void 0 : calendar.url}`);
    const requiredFields = ['url'];
    if (!calendar || !hasFields(calendar, requiredFields)) {
        if (!calendar) {
            throw new Error('cannot fetchCalendarObjects for undefined calendar');
        }
        throw new Error(`calendar must have ${findMissingFieldNames(calendar, requiredFields)} before fetchCalendarObjects`);
    }
    // default to fetch all
    const filters = customFilters !== null && customFilters !== void 0 ? customFilters : [
        {
            'comp-filter': {
                _attributes: {
                    name: 'VCALENDAR',
                },
                'comp-filter': {
                    _attributes: {
                        name: 'VEVENT',
                    },
                    ...(timeRange
                        ? {
                            'time-range': {
                                _attributes: {
                                    start: `${new Date(timeRange.start)
                                        .toISOString()
                                        .slice(0, 19)
                                        .replace(/[-:.]/g, '')}Z`,
                                    end: `${new Date(timeRange.end)
                                        .toISOString()
                                        .slice(0, 19)
                                        .replace(/[-:.]/g, '')}Z`,
                                },
                            },
                        }
                        : {}),
                },
            },
        },
    ];
    const calendarObjectUrls = (objectUrls !== null && objectUrls !== void 0 ? objectUrls : 
    // fetch all objects of the calendar
    (await calendarQuery({
        url: calendar.url,
        props: {
            [`${DAVNamespaceShort.DAV}:getetag`]: {
                ...(expand && timeRange
                    ? {
                        [`${DAVNamespaceShort.CALDAV}:expand`]: {
                            _attributes: {
                                start: `${new Date(timeRange.start)
                                    .toISOString()
                                    .slice(0, 19)
                                    .replace(/[-:.]/g, '')}Z`,
                                end: `${new Date(timeRange.end)
                                    .toISOString()
                                    .slice(0, 19)
                                    .replace(/[-:.]/g, '')}Z`,
                            },
                        },
                    }
                    : {}),
            },
        },
        filters,
        depth: '1',
        headers: excludeHeaders(headers, headersToExclude),
    })).map((res) => { var _a; return (_a = res.href) !== null && _a !== void 0 ? _a : ''; }))
        .map((url) => (url.startsWith('http') || !url ? url : new URL(url, calendar.url).href)) // patch up to full url if url is not full
        .filter(urlFilter) // custom filter function on calendar objects
        .map((url) => new URL(url).pathname); // obtain pathname of the url
    let calendarObjectResults = [];
    if (calendarObjectUrls.length > 0) {
        if (!useMultiGet || expand) {
            calendarObjectResults = await calendarQuery({
                url: calendar.url,
                props: {
                    [`${DAVNamespaceShort.DAV}:getetag`]: {},
                    [`${DAVNamespaceShort.CALDAV}:calendar-data`]: {
                        ...(expand && timeRange
                            ? {
                                [`${DAVNamespaceShort.CALDAV}:expand`]: {
                                    _attributes: {
                                        start: `${new Date(timeRange.start)
                                            .toISOString()
                                            .slice(0, 19)
                                            .replace(/[-:.]/g, '')}Z`,
                                        end: `${new Date(timeRange.end)
                                            .toISOString()
                                            .slice(0, 19)
                                            .replace(/[-:.]/g, '')}Z`,
                                    },
                                },
                            }
                            : {}),
                    },
                },
                filters,
                depth: '1',
                headers: excludeHeaders(headers, headersToExclude),
            });
        }
        else {
            calendarObjectResults = await calendarMultiGet({
                url: calendar.url,
                props: {
                    [`${DAVNamespaceShort.DAV}:getetag`]: {},
                    [`${DAVNamespaceShort.CALDAV}:calendar-data`]: {
                        ...(expand && timeRange
                            ? {
                                [`${DAVNamespaceShort.CALDAV}:expand`]: {
                                    _attributes: {
                                        start: `${new Date(timeRange.start)
                                            .toISOString()
                                            .slice(0, 19)
                                            .replace(/[-:.]/g, '')}Z`,
                                        end: `${new Date(timeRange.end)
                                            .toISOString()
                                            .slice(0, 19)
                                            .replace(/[-:.]/g, '')}Z`,
                                    },
                                },
                            }
                            : {}),
                    },
                },
                objectUrls: calendarObjectUrls,
                depth: '1',
                headers: excludeHeaders(headers, headersToExclude),
            });
        }
    }
    return calendarObjectResults.map((res) => {
        var _a, _b, _c, _d, _e, _f;
        return ({
            url: new URL((_a = res.href) !== null && _a !== void 0 ? _a : '', calendar.url).href,
            etag: `${(_b = res.props) === null || _b === void 0 ? void 0 : _b.getetag}`,
            data: (_e = (_d = (_c = res.props) === null || _c === void 0 ? void 0 : _c.calendarData) === null || _d === void 0 ? void 0 : _d._cdata) !== null && _e !== void 0 ? _e : (_f = res.props) === null || _f === void 0 ? void 0 : _f.calendarData,
        });
    });
};
const createCalendarObject = async (params) => {
    const { calendar, iCalString, filename, headers, headersToExclude } = params;
    return createObject({
        url: new URL(filename, calendar.url).href,
        data: iCalString,
        headers: excludeHeaders({
            'content-type': 'text/calendar; charset=utf-8',
            'If-None-Match': '*',
            ...headers,
        }, headersToExclude),
    });
};
const updateCalendarObject = async (params) => {
    const { calendarObject, headers, headersToExclude } = params;
    return updateObject({
        url: calendarObject.url,
        data: calendarObject.data,
        etag: calendarObject.etag,
        headers: excludeHeaders({
            'content-type': 'text/calendar; charset=utf-8',
            ...headers,
        }, headersToExclude),
    });
};
const deleteCalendarObject = async (params) => {
    const { calendarObject, headers, headersToExclude } = params;
    return deleteObject({
        url: calendarObject.url,
        etag: calendarObject.etag,
        headers: excludeHeaders(headers, headersToExclude),
    });
};
/**
 * Sync remote calendars to local
 */
const syncCalendars = async (params) => {
    var _a;
    const { oldCalendars, account, detailedResult, headers, headersToExclude } = params;
    if (!account) {
        throw new Error('Must have account before syncCalendars');
    }
    const localCalendars = (_a = oldCalendars !== null && oldCalendars !== void 0 ? oldCalendars : account.calendars) !== null && _a !== void 0 ? _a : [];
    const remoteCalendars = await fetchCalendars({
        account,
        headers: excludeHeaders(headers, headersToExclude),
    });
    // no existing url
    const created = remoteCalendars.filter((rc) => localCalendars.every((lc) => !urlContains(lc.url, rc.url)));
    debug$2(`new calendars: ${created.map((cc) => cc.displayName)}`);
    // have same url, but syncToken/ctag different
    const updated = localCalendars.reduce((prev, curr) => {
        const found = remoteCalendars.find((rc) => urlContains(rc.url, curr.url));
        if (found &&
            ((found.syncToken && found.syncToken !== curr.syncToken) ||
                (found.ctag && found.ctag !== curr.ctag))) {
            return [...prev, found];
        }
        return prev;
    }, []);
    debug$2(`updated calendars: ${updated.map((cc) => cc.displayName)}`);
    const updatedWithObjects = await Promise.all(updated.map(async (u) => {
        const result = await smartCollectionSync({
            collection: { ...u, objectMultiGet: calendarMultiGet },
            method: 'webdav',
            headers: excludeHeaders(headers, headersToExclude),
            account,
        });
        return result;
    }));
    // does not present in remote
    const deleted = localCalendars.filter((cal) => remoteCalendars.every((rc) => !urlContains(rc.url, cal.url)));
    debug$2(`deleted calendars: ${deleted.map((cc) => cc.displayName)}`);
    const unchanged = localCalendars.filter((cal) => remoteCalendars.some((rc) => urlContains(rc.url, cal.url) &&
        ((rc.syncToken && rc.syncToken !== cal.syncToken) || (rc.ctag && rc.ctag !== cal.ctag))));
    // debug(`unchanged calendars: ${unchanged.map((cc) => cc.displayName)}`);
    return detailedResult
        ? {
            created,
            updated,
            deleted,
        }
        : [...unchanged, ...created, ...updatedWithObjects];
};
const freeBusyQuery = async (params) => {
    const { url, timeRange, depth, headers, headersToExclude } = params;
    if (timeRange) {
        // validate timeRange
        const ISO_8601 = /^\d{4}(-\d\d(-\d\d(T\d\d:\d\d(:\d\d)?(\.\d+)?(([+-]\d\d:\d\d)|Z)?)?)?)?$/i;
        const ISO_8601_FULL = /^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d(\.\d+)?(([+-]\d\d:\d\d)|Z)?$/i;
        if ((!ISO_8601.test(timeRange.start) || !ISO_8601.test(timeRange.end)) &&
            (!ISO_8601_FULL.test(timeRange.start) || !ISO_8601_FULL.test(timeRange.end))) {
            throw new Error('invalid timeRange format, not in ISO8601');
        }
    }
    else {
        throw new Error('timeRange is required');
    }
    const result = await collectionQuery({
        url,
        body: {
            'free-busy-query': cleanupFalsy({
                _attributes: getDAVAttribute([DAVNamespace.CALDAV]),
                [`${DAVNamespaceShort.CALDAV}:time-range`]: {
                    _attributes: {
                        start: `${new Date(timeRange.start).toISOString().slice(0, 19).replace(/[-:.]/g, '')}Z`,
                        end: `${new Date(timeRange.end).toISOString().slice(0, 19).replace(/[-:.]/g, '')}Z`,
                    },
                },
            }),
        },
        defaultNamespace: DAVNamespaceShort.CALDAV,
        depth,
        headers: excludeHeaders(headers, headersToExclude),
    });
    return result[0];
};

var calendar = /*#__PURE__*/Object.freeze({
	__proto__: null,
	calendarMultiGet: calendarMultiGet,
	calendarQuery: calendarQuery,
	createCalendarObject: createCalendarObject,
	deleteCalendarObject: deleteCalendarObject,
	fetchCalendarObjects: fetchCalendarObjects,
	fetchCalendars: fetchCalendars,
	freeBusyQuery: freeBusyQuery,
	makeCalendar: makeCalendar,
	syncCalendars: syncCalendars,
	updateCalendarObject: updateCalendarObject
});

const debug$1 = getLogger('tsdav:account');
const serviceDiscovery = async (params) => {
    var _a, _b;
    debug$1('Service discovery...');
    const { account, headers, headersToExclude } = params;
    const endpoint = new URL(account.serverUrl);
    const uri = new URL(`/.well-known/${account.accountType}`, endpoint);
    uri.protocol = (_a = endpoint.protocol) !== null && _a !== void 0 ? _a : 'http';
    try {
        const response = await browserPonyfillExports.fetch(uri.href, {
            headers: excludeHeaders(headers, headersToExclude),
            method: 'PROPFIND',
            redirect: 'manual',
        });
        if (response.status >= 300 && response.status < 400) {
            // http redirect.
            const location = response.headers.get('Location');
            if (typeof location === 'string' && location.length) {
                debug$1(`Service discovery redirected to ${location}`);
                const serviceURL = new URL(location, endpoint);
                if (serviceURL.hostname === uri.hostname && uri.port && !serviceURL.port) {
                    serviceURL.port = uri.port;
                }
                serviceURL.protocol = (_b = endpoint.protocol) !== null && _b !== void 0 ? _b : 'http';
                return serviceURL.href;
            }
        }
    }
    catch (err) {
        debug$1(`Service discovery failed: ${err.stack}`);
    }
    return endpoint.href;
};
const fetchPrincipalUrl = async (params) => {
    var _a, _b, _c, _d, _e;
    const { account, headers, headersToExclude } = params;
    const requiredFields = ['rootUrl'];
    if (!hasFields(account, requiredFields)) {
        throw new Error(`account must have ${findMissingFieldNames(account, requiredFields)} before fetchPrincipalUrl`);
    }
    debug$1(`Fetching principal url from path ${account.rootUrl}`);
    const [response] = await propfind({
        url: account.rootUrl,
        props: {
            [`${DAVNamespaceShort.DAV}:current-user-principal`]: {},
        },
        depth: '0',
        headers: excludeHeaders(headers, headersToExclude),
    });
    if (!response.ok) {
        debug$1(`Fetch principal url failed: ${response.statusText}`);
        if (response.status === 401) {
            throw new Error('Invalid credentials');
        }
    }
    debug$1(`Fetched principal url ${(_b = (_a = response.props) === null || _a === void 0 ? void 0 : _a.currentUserPrincipal) === null || _b === void 0 ? void 0 : _b.href}`);
    return new URL((_e = (_d = (_c = response.props) === null || _c === void 0 ? void 0 : _c.currentUserPrincipal) === null || _d === void 0 ? void 0 : _d.href) !== null && _e !== void 0 ? _e : '', account.rootUrl).href;
};
const fetchHomeUrl = async (params) => {
    var _a, _b;
    const { account, headers, headersToExclude } = params;
    const requiredFields = ['principalUrl', 'rootUrl'];
    if (!hasFields(account, requiredFields)) {
        throw new Error(`account must have ${findMissingFieldNames(account, requiredFields)} before fetchHomeUrl`);
    }
    debug$1(`Fetch home url from ${account.principalUrl}`);
    const responses = await propfind({
        url: account.principalUrl,
        props: account.accountType === 'caldav'
            ? { [`${DAVNamespaceShort.CALDAV}:calendar-home-set`]: {} }
            : { [`${DAVNamespaceShort.CARDDAV}:addressbook-home-set`]: {} },
        depth: '0',
        headers: excludeHeaders(headers, headersToExclude),
    });
    const matched = responses.find((r) => urlContains(account.principalUrl, r.href));
    if (!matched || !matched.ok) {
        throw new Error('cannot find homeUrl');
    }
    const result = new URL(account.accountType === 'caldav'
        ? (_a = matched === null || matched === void 0 ? void 0 : matched.props) === null || _a === void 0 ? void 0 : _a.calendarHomeSet.href
        : (_b = matched === null || matched === void 0 ? void 0 : matched.props) === null || _b === void 0 ? void 0 : _b.addressbookHomeSet.href, account.rootUrl).href;
    debug$1(`Fetched home url ${result}`);
    return result;
};
const createAccount = async (params) => {
    const { account, headers, loadCollections = false, loadObjects = false, headersToExclude, } = params;
    const newAccount = { ...account };
    newAccount.rootUrl =
        newAccount.rootUrl ||
            (await serviceDiscovery({
                account,
                headers: excludeHeaders(headers, headersToExclude),
            }));
    newAccount.principalUrl =
        newAccount.principalUrl ||
            (await fetchPrincipalUrl({
                account: newAccount,
                headers: excludeHeaders(headers, headersToExclude),
            }));
    newAccount.homeUrl =
        newAccount.homeUrl ||
            (await fetchHomeUrl({
                account: newAccount,
                headers: excludeHeaders(headers, headersToExclude),
            }));
    // to load objects you must first load collections
    if (loadCollections || loadObjects) {
        if (account.accountType === 'caldav') {
            newAccount.calendars = await fetchCalendars({
                headers: excludeHeaders(headers, headersToExclude),
                account: newAccount,
            });
        }
        else if (account.accountType === 'carddav') {
            newAccount.addressBooks = await fetchAddressBooks({
                headers: excludeHeaders(headers, headersToExclude),
                account: newAccount,
            });
        }
    }
    if (loadObjects) {
        if (account.accountType === 'caldav' && newAccount.calendars) {
            newAccount.calendars = await Promise.all(newAccount.calendars.map(async (cal) => ({
                ...cal,
                objects: await fetchCalendarObjects({
                    calendar: cal,
                    headers: excludeHeaders(headers, headersToExclude),
                }),
            })));
        }
        else if (account.accountType === 'carddav' && newAccount.addressBooks) {
            newAccount.addressBooks = await Promise.all(newAccount.addressBooks.map(async (addr) => ({
                ...addr,
                objects: await fetchVCards({
                    addressBook: addr,
                    headers: excludeHeaders(headers, headersToExclude),
                }),
            })));
        }
    }
    return newAccount;
};

var account = /*#__PURE__*/Object.freeze({
	__proto__: null,
	createAccount: createAccount,
	fetchHomeUrl: fetchHomeUrl,
	fetchPrincipalUrl: fetchPrincipalUrl,
	serviceDiscovery: serviceDiscovery
});

var base64$1 = {exports: {}};

/*! https://mths.be/base64 v1.0.0 by @mathias | MIT license */
var base64 = base64$1.exports;

var hasRequiredBase64;

function requireBase64 () {
	if (hasRequiredBase64) return base64$1.exports;
	hasRequiredBase64 = 1;
	(function (module, exports) {
(function(root) {

			// Detect free variables `exports`.
			var freeExports = exports;

			// Detect free variable `module`.
			var freeModule = module &&
				module.exports == freeExports && module;

			// Detect free variable `global`, from Node.js or Browserified code, and use
			// it as `root`.
			var freeGlobal = typeof commonjsGlobal == 'object' && commonjsGlobal;
			if (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal) {
				root = freeGlobal;
			}

			/*--------------------------------------------------------------------------*/

			var InvalidCharacterError = function(message) {
				this.message = message;
			};
			InvalidCharacterError.prototype = new Error;
			InvalidCharacterError.prototype.name = 'InvalidCharacterError';

			var error = function(message) {
				// Note: the error messages used throughout this file match those used by
				// the native `atob`/`btoa` implementation in Chromium.
				throw new InvalidCharacterError(message);
			};

			var TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
			// http://whatwg.org/html/common-microsyntaxes.html#space-character
			var REGEX_SPACE_CHARACTERS = /[\t\n\f\r ]/g;

			// `decode` is designed to be fully compatible with `atob` as described in the
			// HTML Standard. http://whatwg.org/html/webappapis.html#dom-windowbase64-atob
			// The optimized base64-decoding algorithm used is based on @atk’s excellent
			// implementation. https://gist.github.com/atk/1020396
			var decode = function(input) {
				input = String(input)
					.replace(REGEX_SPACE_CHARACTERS, '');
				var length = input.length;
				if (length % 4 == 0) {
					input = input.replace(/==?$/, '');
					length = input.length;
				}
				if (
					length % 4 == 1 ||
					// http://whatwg.org/C#alphanumeric-ascii-characters
					/[^+a-zA-Z0-9/]/.test(input)
				) {
					error(
						'Invalid character: the string to be decoded is not correctly encoded.'
					);
				}
				var bitCounter = 0;
				var bitStorage;
				var buffer;
				var output = '';
				var position = -1;
				while (++position < length) {
					buffer = TABLE.indexOf(input.charAt(position));
					bitStorage = bitCounter % 4 ? bitStorage * 64 + buffer : buffer;
					// Unless this is the first of a group of 4 characters…
					if (bitCounter++ % 4) {
						// …convert the first 8 bits to a single ASCII character.
						output += String.fromCharCode(
							0xFF & bitStorage >> (-2 * bitCounter & 6)
						);
					}
				}
				return output;
			};

			// `encode` is designed to be fully compatible with `btoa` as described in the
			// HTML Standard: http://whatwg.org/html/webappapis.html#dom-windowbase64-btoa
			var encode = function(input) {
				input = String(input);
				if (/[^\0-\xFF]/.test(input)) {
					// Note: no need to special-case astral symbols here, as surrogates are
					// matched, and the input is supposed to only contain ASCII anyway.
					error(
						'The string to be encoded contains characters outside of the ' +
						'Latin1 range.'
					);
				}
				var padding = input.length % 3;
				var output = '';
				var position = -1;
				var a;
				var b;
				var c;
				var buffer;
				// Make sure any padding is handled outside of the loop.
				var length = input.length - padding;

				while (++position < length) {
					// Read three bytes, i.e. 24 bits.
					a = input.charCodeAt(position) << 16;
					b = input.charCodeAt(++position) << 8;
					c = input.charCodeAt(++position);
					buffer = a + b + c;
					// Turn the 24 bits into four chunks of 6 bits each, and append the
					// matching character for each of them to the output.
					output += (
						TABLE.charAt(buffer >> 18 & 0x3F) +
						TABLE.charAt(buffer >> 12 & 0x3F) +
						TABLE.charAt(buffer >> 6 & 0x3F) +
						TABLE.charAt(buffer & 0x3F)
					);
				}

				if (padding == 2) {
					a = input.charCodeAt(position) << 8;
					b = input.charCodeAt(++position);
					buffer = a + b;
					output += (
						TABLE.charAt(buffer >> 10) +
						TABLE.charAt((buffer >> 4) & 0x3F) +
						TABLE.charAt((buffer << 2) & 0x3F) +
						'='
					);
				} else if (padding == 1) {
					buffer = input.charCodeAt(position);
					output += (
						TABLE.charAt(buffer >> 2) +
						TABLE.charAt((buffer << 4) & 0x3F) +
						'=='
					);
				}

				return output;
			};

			var base64 = {
				'encode': encode,
				'decode': decode,
				'version': '1.0.0'
			};

			// Some AMD build optimizers, like r.js, check for specific condition patterns
			// like the following:
			if (freeExports && !freeExports.nodeType) {
				if (freeModule) { // in Node.js or RingoJS v0.8.0+
					freeModule.exports = base64;
				} else { // in Narwhal or RingoJS v0.7.0-
					for (var key in base64) {
						base64.hasOwnProperty(key) && (freeExports[key] = base64[key]);
					}
				}
			} else { // in Rhino or a web browser
				root.base64 = base64;
			}

		}(base64)); 
	} (base64$1, base64$1.exports));
	return base64$1.exports;
}

var base64Exports = requireBase64();

const debug = getLogger('tsdav:authHelper');
/**
 * Provide given params as default params to given function with optional params.
 *
 * suitable only for one param functions
 * params are shallow merged
 */
const defaultParam = (fn, params) => (...args) => {
    return fn({ ...params, ...args[0] });
};
const getBasicAuthHeaders = (credentials) => {
    debug(`Basic auth token generated: ${base64Exports.encode(`${credentials.username}:${credentials.password}`)}`);
    return {
        authorization: `Basic ${base64Exports.encode(`${credentials.username}:${credentials.password}`)}`,
    };
};
const fetchOauthTokens = async (credentials) => {
    const requireFields = [
        'authorizationCode',
        'redirectUrl',
        'clientId',
        'clientSecret',
        'tokenUrl',
    ];
    if (!hasFields(credentials, requireFields)) {
        throw new Error(`Oauth credentials missing: ${findMissingFieldNames(credentials, requireFields)}`);
    }
    const param = new URLSearchParams({
        grant_type: 'authorization_code',
        code: credentials.authorizationCode,
        redirect_uri: credentials.redirectUrl,
        client_id: credentials.clientId,
        client_secret: credentials.clientSecret,
    });
    debug(credentials.tokenUrl);
    debug(param.toString());
    const response = await browserPonyfillExports.fetch(credentials.tokenUrl, {
        method: 'POST',
        body: param.toString(),
        headers: {
            'content-length': `${param.toString().length}`,
            'content-type': 'application/x-www-form-urlencoded',
        },
    });
    if (response.ok) {
        const tokens = await response.json();
        return tokens;
    }
    debug(`Fetch Oauth tokens failed: ${await response.text()}`);
    return {};
};
const refreshAccessToken = async (credentials) => {
    const requireFields = [
        'refreshToken',
        'clientId',
        'clientSecret',
        'tokenUrl',
    ];
    if (!hasFields(credentials, requireFields)) {
        throw new Error(`Oauth credentials missing: ${findMissingFieldNames(credentials, requireFields)}`);
    }
    const param = new URLSearchParams({
        client_id: credentials.clientId,
        client_secret: credentials.clientSecret,
        refresh_token: credentials.refreshToken,
        grant_type: 'refresh_token',
    });
    const response = await browserPonyfillExports.fetch(credentials.tokenUrl, {
        method: 'POST',
        body: param.toString(),
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
        },
    });
    if (response.ok) {
        const tokens = await response.json();
        return tokens;
    }
    debug(`Refresh access token failed: ${await response.text()}`);
    return {};
};
const getOauthHeaders = async (credentials) => {
    var _a;
    debug('Fetching oauth headers');
    let tokens = {};
    if (!credentials.refreshToken) {
        // No refresh token, fetch new tokens
        tokens = await fetchOauthTokens(credentials);
    }
    else if ((credentials.refreshToken && !credentials.accessToken) ||
        Date.now() > ((_a = credentials.expiration) !== null && _a !== void 0 ? _a : 0)) {
        // have refresh token, but no accessToken, fetch access token only
        // or have both, but accessToken was expired
        tokens = await refreshAccessToken(credentials);
    }
    // now we should have valid access token
    debug(`Oauth tokens fetched: ${tokens.access_token}`);
    return {
        tokens,
        headers: {
            authorization: `Bearer ${tokens.access_token}`,
        },
    };
};

var authHelpers = /*#__PURE__*/Object.freeze({
	__proto__: null,
	defaultParam: defaultParam,
	fetchOauthTokens: fetchOauthTokens,
	getBasicAuthHeaders: getBasicAuthHeaders,
	getOauthHeaders: getOauthHeaders,
	refreshAccessToken: refreshAccessToken
});

const createDAVClient = async (params) => {
    var _a;
    const { serverUrl, credentials, authMethod, defaultAccountType, authFunction, rootUrl, principalUrl, homeUrl, } = params;
    let authHeaders = {};
    switch (authMethod) {
        case 'Basic':
            authHeaders = getBasicAuthHeaders(credentials);
            break;
        case 'Oauth':
            authHeaders = (await getOauthHeaders(credentials)).headers;
            break;
        case 'Digest':
            authHeaders = {
                Authorization: `Digest ${credentials.digestString}`,
            };
            break;
        case 'Custom':
            authHeaders = (_a = (await (authFunction === null || authFunction === void 0 ? void 0 : authFunction(credentials)))) !== null && _a !== void 0 ? _a : {};
            break;
        default:
            throw new Error('Invalid auth method');
    }
    const defaultAccount = defaultAccountType
        ? await createAccount({
            account: {
                serverUrl,
                credentials,
                accountType: defaultAccountType,
                rootUrl,
                principalUrl,
                homeUrl,
            },
            headers: authHeaders,
        })
        : undefined;
    const davRequest$1 = async (params0) => {
        const { init, ...rest } = params0;
        const { headers, ...restInit } = init;
        return davRequest({
            ...rest,
            init: {
                ...restInit,
                headers: {
                    ...authHeaders,
                    ...headers,
                },
            },
        });
    };
    const createObject$1 = defaultParam(createObject, {
        url: serverUrl,
        headers: authHeaders,
    });
    const updateObject$1 = defaultParam(updateObject, { headers: authHeaders, url: serverUrl });
    const deleteObject$1 = defaultParam(deleteObject, { headers: authHeaders, url: serverUrl });
    const propfind$1 = defaultParam(propfind, { headers: authHeaders });
    // account
    const createAccount$1 = async (params0) => {
        const { account, headers, loadCollections, loadObjects } = params0;
        return createAccount({
            account: { serverUrl, credentials, ...account },
            headers: { ...authHeaders, ...headers },
            loadCollections,
            loadObjects,
        });
    };
    // collection
    const collectionQuery$1 = defaultParam(collectionQuery, { headers: authHeaders });
    const makeCollection$1 = defaultParam(makeCollection, { headers: authHeaders });
    const syncCollection$1 = defaultParam(syncCollection, { headers: authHeaders });
    const supportedReportSet$1 = defaultParam(supportedReportSet, {
        headers: authHeaders,
    });
    const isCollectionDirty$1 = defaultParam(isCollectionDirty, {
        headers: authHeaders,
    });
    const smartCollectionSync$1 = defaultParam(smartCollectionSync, {
        headers: authHeaders,
        account: defaultAccount,
    });
    // calendar
    const calendarQuery$1 = defaultParam(calendarQuery, { headers: authHeaders });
    const calendarMultiGet$1 = defaultParam(calendarMultiGet, { headers: authHeaders });
    const makeCalendar$1 = defaultParam(makeCalendar, { headers: authHeaders });
    const fetchCalendars$1 = defaultParam(fetchCalendars, {
        headers: authHeaders,
        account: defaultAccount,
    });
    const fetchCalendarObjects$1 = defaultParam(fetchCalendarObjects, {
        headers: authHeaders,
    });
    const createCalendarObject$1 = defaultParam(createCalendarObject, {
        headers: authHeaders,
    });
    const updateCalendarObject$1 = defaultParam(updateCalendarObject, {
        headers: authHeaders,
    });
    const deleteCalendarObject$1 = defaultParam(deleteCalendarObject, {
        headers: authHeaders,
    });
    const syncCalendars$1 = defaultParam(syncCalendars, {
        account: defaultAccount,
        headers: authHeaders,
    });
    // addressBook
    const addressBookQuery$1 = defaultParam(addressBookQuery, { headers: authHeaders });
    const addressBookMultiGet$1 = defaultParam(addressBookMultiGet, { headers: authHeaders });
    const fetchAddressBooks$1 = defaultParam(fetchAddressBooks, {
        account: defaultAccount,
        headers: authHeaders,
    });
    const fetchVCards$1 = defaultParam(fetchVCards, { headers: authHeaders });
    const createVCard$1 = defaultParam(createVCard, { headers: authHeaders });
    const updateVCard$1 = defaultParam(updateVCard, { headers: authHeaders });
    const deleteVCard$1 = defaultParam(deleteVCard, { headers: authHeaders });
    return {
        davRequest: davRequest$1,
        propfind: propfind$1,
        createAccount: createAccount$1,
        createObject: createObject$1,
        updateObject: updateObject$1,
        deleteObject: deleteObject$1,
        calendarQuery: calendarQuery$1,
        addressBookQuery: addressBookQuery$1,
        collectionQuery: collectionQuery$1,
        makeCollection: makeCollection$1,
        calendarMultiGet: calendarMultiGet$1,
        makeCalendar: makeCalendar$1,
        syncCollection: syncCollection$1,
        supportedReportSet: supportedReportSet$1,
        isCollectionDirty: isCollectionDirty$1,
        smartCollectionSync: smartCollectionSync$1,
        fetchCalendars: fetchCalendars$1,
        fetchCalendarObjects: fetchCalendarObjects$1,
        createCalendarObject: createCalendarObject$1,
        updateCalendarObject: updateCalendarObject$1,
        deleteCalendarObject: deleteCalendarObject$1,
        syncCalendars: syncCalendars$1,
        fetchAddressBooks: fetchAddressBooks$1,
        addressBookMultiGet: addressBookMultiGet$1,
        fetchVCards: fetchVCards$1,
        createVCard: createVCard$1,
        updateVCard: updateVCard$1,
        deleteVCard: deleteVCard$1,
        defaultAccount,
    };
};
class DAVClient {
    constructor(params) {
        var _a, _b;
        this.serverUrl = params.serverUrl;
        this.credentials = params.credentials;
        this.authMethod = (_a = params.authMethod) !== null && _a !== void 0 ? _a : 'Basic';
        this.accountType = (_b = params.defaultAccountType) !== null && _b !== void 0 ? _b : 'caldav';
    }
    async login() {
        var _a;
        switch (this.authMethod) {
            case 'Basic':
                this.authHeaders = getBasicAuthHeaders(this.credentials);
                break;
            case 'Oauth':
                this.authHeaders = (await getOauthHeaders(this.credentials)).headers;
                break;
            case 'Digest':
                this.authHeaders = {
                    Authorization: `Digest ${this.credentials.digestString}`,
                };
                break;
            case 'Custom':
                this.authHeaders = await ((_a = this.authFunction) === null || _a === void 0 ? void 0 : _a.call(this, this.credentials));
                break;
            default:
                throw new Error('Invalid auth method');
        }
        this.account = this.accountType
            ? await createAccount({
                account: {
                    serverUrl: this.serverUrl,
                    credentials: this.credentials,
                    accountType: this.accountType,
                },
                headers: this.authHeaders,
            })
            : undefined;
    }
    async davRequest(params0) {
        const { init, ...rest } = params0;
        const { headers, ...restInit } = init;
        return davRequest({
            ...rest,
            init: {
                ...restInit,
                headers: {
                    ...this.authHeaders,
                    ...headers,
                },
            },
        });
    }
    async createObject(...params) {
        return defaultParam(createObject, {
            url: this.serverUrl,
            headers: this.authHeaders,
        })(params[0]);
    }
    async updateObject(...params) {
        return defaultParam(updateObject, { headers: this.authHeaders, url: this.serverUrl })(params[0]);
    }
    async deleteObject(...params) {
        return defaultParam(deleteObject, { headers: this.authHeaders, url: this.serverUrl })(params[0]);
    }
    async propfind(...params) {
        return defaultParam(propfind, { headers: this.authHeaders })(params[0]);
    }
    async createAccount(params0) {
        const { account, headers, loadCollections, loadObjects } = params0;
        return createAccount({
            account: { serverUrl: this.serverUrl, credentials: this.credentials, ...account },
            headers: { ...this.authHeaders, ...headers },
            loadCollections,
            loadObjects,
        });
    }
    async collectionQuery(...params) {
        return defaultParam(collectionQuery, { headers: this.authHeaders })(params[0]);
    }
    async makeCollection(...params) {
        return defaultParam(makeCollection, { headers: this.authHeaders })(params[0]);
    }
    async syncCollection(...params) {
        return defaultParam(syncCollection, { headers: this.authHeaders })(params[0]);
    }
    async supportedReportSet(...params) {
        return defaultParam(supportedReportSet, { headers: this.authHeaders })(params[0]);
    }
    async isCollectionDirty(...params) {
        return defaultParam(isCollectionDirty, { headers: this.authHeaders })(params[0]);
    }
    async smartCollectionSync(...params) {
        return defaultParam(smartCollectionSync, {
            headers: this.authHeaders,
            account: this.account,
        })(params[0]);
    }
    async calendarQuery(...params) {
        return defaultParam(calendarQuery, { headers: this.authHeaders })(params[0]);
    }
    async makeCalendar(...params) {
        return defaultParam(makeCalendar, { headers: this.authHeaders })(params[0]);
    }
    async calendarMultiGet(...params) {
        return defaultParam(calendarMultiGet, { headers: this.authHeaders })(params[0]);
    }
    async fetchCalendars(...params) {
        return defaultParam(fetchCalendars, { headers: this.authHeaders, account: this.account })(params === null || params === void 0 ? void 0 : params[0]);
    }
    async fetchCalendarObjects(...params) {
        return defaultParam(fetchCalendarObjects, { headers: this.authHeaders })(params[0]);
    }
    async createCalendarObject(...params) {
        return defaultParam(createCalendarObject, { headers: this.authHeaders })(params[0]);
    }
    async updateCalendarObject(...params) {
        return defaultParam(updateCalendarObject, { headers: this.authHeaders })(params[0]);
    }
    async deleteCalendarObject(...params) {
        return defaultParam(deleteCalendarObject, { headers: this.authHeaders })(params[0]);
    }
    async syncCalendars(...params) {
        return defaultParam(syncCalendars, {
            headers: this.authHeaders,
            account: this.account,
        })(params[0]);
    }
    async addressBookQuery(...params) {
        return defaultParam(addressBookQuery, { headers: this.authHeaders })(params[0]);
    }
    async addressBookMultiGet(...params) {
        return defaultParam(addressBookMultiGet, { headers: this.authHeaders })(params[0]);
    }
    async fetchAddressBooks(...params) {
        return defaultParam(fetchAddressBooks, { headers: this.authHeaders, account: this.account })(params === null || params === void 0 ? void 0 : params[0]);
    }
    async fetchVCards(...params) {
        return defaultParam(fetchVCards, { headers: this.authHeaders })(params[0]);
    }
    async createVCard(...params) {
        return defaultParam(createVCard, { headers: this.authHeaders })(params[0]);
    }
    async updateVCard(...params) {
        return defaultParam(updateVCard, { headers: this.authHeaders })(params[0]);
    }
    async deleteVCard(...params) {
        return defaultParam(deleteVCard, { headers: this.authHeaders })(params[0]);
    }
}

var client = /*#__PURE__*/Object.freeze({
	__proto__: null,
	DAVClient: DAVClient,
	createDAVClient: createDAVClient
});

var index = {
    DAVNamespace,
    DAVNamespaceShort,
    DAVAttributeMap,
    ...client,
    ...request,
    ...collection,
    ...account,
    ...addressBook,
    ...calendar,
    ...authHelpers,
    ...requestHelpers,
};

export { DAVAttributeMap, DAVClient, DAVNamespace, DAVNamespaceShort, addressBookQuery, calendarMultiGet, calendarQuery, cleanupFalsy, collectionQuery, createAccount, createCalendarObject, createDAVClient, createObject, createVCard, davRequest, index as default, deleteCalendarObject, deleteObject, deleteVCard, fetchAddressBooks, fetchCalendarObjects, fetchCalendars, fetchOauthTokens, fetchVCards, freeBusyQuery, getBasicAuthHeaders, getDAVAttribute, getOauthHeaders, isCollectionDirty, makeCalendar, propfind, refreshAccessToken, smartCollectionSync, supportedReportSet, syncCalendars, syncCollection, updateCalendarObject, updateObject, updateVCard, urlContains, urlEquals };