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/**
 * Fetch
 * https://github.com/github/fetch
 *
 * Released under the MIT License (MIT)
 * https://github.com/github/fetch/blob/master/LICENSE
 */
( function ( global, factory ) {
	typeof exports === 'object' && typeof module !== 'undefined'
		? factory( exports )
		: typeof define === 'function' && define.amd
		? define( [ 'exports' ], factory )
		: factory( ( global.WHATWGFetch = {} ) );
} )( this, function ( exports ) {
	'use strict';

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

	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 ) ) {
			throw new TypeError( 'Invalid character in header field 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 ) {
			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 ) {
					return (
						consumed( this ) ||
						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 ) {
		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 );
	}

	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, ' ' );
		preProcessedHeaders.split( /\r?\n/ ).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 ( ! options ) {
			options = {};
		}

		this.type = 'default';
		this.status = options.status === undefined ? 200 : options.status;
		this.ok = this.status >= 200 && this.status < 300;
		this.statusText = 'statusText' in options ? options.statusText : 'OK';
		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 = self.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;
				resolve( new Response( body, options ) );
			};

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

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

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

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

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

			if ( 'responseType' in xhr && support.blob ) {
				xhr.responseType = 'blob';
			}

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

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

	Object.defineProperty( exports, '__esModule', { value: true } );
} );