WIP - add extractor, generate snippet_data

node_modules/cross-fetch/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Leonardo Quixadá
+
+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.

node_modules/cross-fetch/README.md

@@ -0,0 +1,190 @@
+cross-fetch<br>
+[![Build Status](https://travis-ci.org/lquixada/cross-fetch.svg?branch=master)](https://travis-ci.org/lquixada/cross-fetch)
+[![Build Status](https://saucelabs.com/buildstatus/cross-fetch)](https://saucelabs.com/u/cross-fetch)
+[![codecov](https://codecov.io/gh/lquixada/cross-fetch/branch/master/graph/badge.svg)](https://codecov.io/gh/lquixada/cross-fetch)
+[![dependencies Status](https://david-dm.org/lquixada/cross-fetch/status.svg)](https://david-dm.org/lquixada/cross-fetch)
+[![NPM Version](https://img.shields.io/npm/v/cross-fetch.svg?branch=master)](https://www.npmjs.com/package/cross-fetch)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+================
+
+Universal WHATWG Fetch API for Node, Browsers and React Native. The scenario that cross-fetch really shines is when the same javascript codebase needs to run on different platforms.
+
+- **Platform agnostic**: browsers, node or react native
+- **Optional polyfill**: it's up to you if something is going to be added to the global object or not
+- **Simple interface**: no instantiation, no configuration and no extra dependency
+- **WHATWG compliant**: it works the same way wherever your code runs
+- **Updated**: lastest version of whatwg-fetch and node-fetch used
+
+
+* * *
+
+## Table of Contents
+
+-   [Install](#install)
+-   [Usage](#usage)
+-   [Demo & API](#demo--api)
+-   [FAQ](#faq)
+-   [Supported environments](#supported-environments)
+-   [Thanks](#thanks)
+-   [License](#license)
+-   [Author](#author)
+-   [Sponsors](#sponsors)
+
+* * *
+
+## Install
+
+```sh
+npm install --save cross-fetch
+```
+
+As a [ponyfill](https://github.com/sindresorhus/ponyfill):
+
+```javascript
+// Using ES6 modules with Babel or TypeScript
+import fetch from 'cross-fetch';
+
+// Using CommonJS modules
+const fetch = require('cross-fetch');
+```
+
+As a polyfill:
+
+```javascript
+// Using ES6 modules
+import 'cross-fetch/polyfill';
+
+// Using CommonJS modules
+require('cross-fetch/polyfill');
+```
+
+
+The CDN build is also available on unpkg:
+
+```html
+<script src="//unpkg.com/cross-fetch/dist/cross-fetch.js"></script>
+```
+
+This adds the fetch function to the window object. Note that this is not UMD compatible.
+
+
+* * *
+
+## Usage
+
+With [promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise):
+
+```javascript
+import fetch from 'cross-fetch';
+// Or just: import 'cross-fetch/polyfill';
+
+fetch('//api.github.com/users/lquixada')
+  .then(res => {
+    if (res.status >= 400) {
+      throw new Error("Bad response from server");
+    }
+    return res.json();
+  })
+  .then(user => {
+    console.log(user);
+  })
+  .catch(err => {
+    console.error(err);
+  });
+```
+
+With [async/await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function):
+
+```javascript
+import fetch from 'cross-fetch';
+// Or just: import 'cross-fetch/polyfill';
+
+(async () => {
+  try {
+    const res = await fetch('//api.github.com/users/lquixada');
+    
+    if (res.status >= 400) {
+      throw new Error("Bad response from server");
+    }
+    
+    const user = await res.json();
+  
+    console.log(user);
+  } catch (err) {
+    console.error(err);
+  }
+})();
+```
+
+> ⚠️ **Warning**: If you're in an environment that doesn't support Promises such as Internet Explorer, you must install an ES6 Promise compatible polyfill. [es6-promise](https://github.com/jakearchibald/es6-promise) is suggested.
+
+
+## Demo & API
+
+You can find a comprehensive doc at [Github's fetch](https://github.github.io/fetch/) page. If you want to play with cross-fetch, these resources can be useful:
+
+* [**JSFiddle playground**](https://jsfiddle.net/lquixada/3ypqgacp/) ➡️
+* [**Public test suite**](https://lquixada.github.io/cross-fetch/test/saucelabs/) ➡️
+
+> **Tip**: Run theses resources on various browsers and with different settings (for instance: cross-domain requests, wrong urls or text requests). Don't forget to open the console in the test suite page and play around.
+
+
+## FAQ
+
+#### Yet another fetch library?
+
+I did a lot of research in order to find a fetch library that could be simple, cross-platorm and provide polyfill as an option. There's a plethora of libs out there but none could match those requirements.
+
+
+#### Why not isomorphic-fetch?
+
+My preferred library used to be [isomorphic-fetch](https://github.com/matthew-andrews/isomorphic-fetch) but it has this [bug](https://github.com/matthew-andrews/isomorphic-fetch/issues/125) that prevents it from running in a react native environment. It seems it will never be fixed since the author hasn't been commiting for more than a year. That means dependencies are outdated as well. 
+
+
+#### Why polyfill might not be a good idea?
+
+In a word? Risk. If the spec changes in the future, it might be problematic to debug. Read more about it on [sindresorhus's ponyfill](https://github.com/sindresorhus/ponyfill#how-are-ponyfills-better-than-polyfills) page. It's up to you if you're fine with it or not.
+
+
+#### How does cross-fetch work?
+
+Just like isomorphic-fetch, it is just a proxy. If you're in node, it delivers you the [node-fetch](https://www.npmjs.com/package/node-fetch) library, if you're in a browser or React Native, it delivers you the github's [whatwg-fetch](https://github.com/github/fetch/). The same strategy applies whether you're using polyfill or ponyfill.
+
+
+## Who's Using It?
+
+* [VulcanJS](http://vulcanjs.org)
+* [graphql-request](https://github.com/graphcool/graphql-request)
+* [Swagger](https://swagger.io/)
+
+
+## Supported environments
+
+* Node 6+
+* React-Native
+
+[![Build Status](https://saucelabs.com/browser-matrix/cross-fetch.svg)](https://saucelabs.com/u/cross-fetch)
+
+
+## Thanks
+
+Heavily inspired by the works of [matthew-andrews](https://github.com/matthew-andrews). Kudos to him!
+
+
+## License
+
+cross-fetch is licensed under the [MIT license](https://github.com/lquixada/cross-fetch/blob/master/LICENSE) © [Leonardo Quixadá](https://twitter.com/lquixada/)
+
+
+## Author
+
+|[![@lquixada](https://avatars0.githubusercontent.com/u/195494?v=4&s=96)](https://github.com/lquixada)|
+|:---:|
+|[@lquixada](http://www.github.com/lquixada)|
+
+
+## Sponsors
+
+Manual cross-browser testing is provided by the following sponsor:
+
+[![BrowserStack](./assets/browserstack-logo.png)](https://www.browserstack.com/)

node_modules/cross-fetch/dist/browser-polyfill.js

@@ -0,0 +1,465 @@
+(function(self) {
+
+  if (self.fetch) {
+    return
+  }
+
+  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
+  };
+
+  if (support.arrayBuffer) {
+    var viewClasses = [
+      '[object Int8Array]',
+      '[object Uint8Array]',
+      '[object Uint8ClampedArray]',
+      '[object Int16Array]',
+      '[object Uint16Array]',
+      '[object Int32Array]',
+      '[object Uint32Array]',
+      '[object Float32Array]',
+      '[object Float64Array]'
+    ];
+
+    var isDataView = function(obj) {
+      return obj && DataView.prototype.isPrototypeOf(obj)
+    };
+
+    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 {
+        throw new Error('unsupported BodyInit type')
+      }
+
+      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;
+      if (!body && input._bodyInit != null) {
+        body = input._bodyInit;
+        input.bodyUsed = true;
+      }
+    } else {
+      this.url = String(input);
+    }
+
+    this.credentials = options.credentials || this.credentials || 'omit';
+    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.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}})
+  };
+
+  self.Headers = Headers;
+  self.Request = Request;
+  self.Response = Response;
+
+  self.fetch = function(input, init) {
+    return new Promise(function(resolve, reject) {
+      var request = new Request(input, init);
+      var xhr = new XMLHttpRequest();
+
+      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.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);
+      });
+
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
+    })
+  };
+  self.fetch.polyfill = true;
+})(typeof self !== 'undefined' ? self : this);

node_modules/cross-fetch/dist/browser-ponyfill.js

@@ -0,0 +1,480 @@
+var __root__ = (function (root) {
+function F() { this.fetch = false; }
+F.prototype = root;
+return new F();
+})(typeof self !== 'undefined' ? self : this);
+(function(self) {
+
+(function(self) {
+
+  if (self.fetch) {
+    return
+  }
+
+  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
+  };
+
+  if (support.arrayBuffer) {
+    var viewClasses = [
+      '[object Int8Array]',
+      '[object Uint8Array]',
+      '[object Uint8ClampedArray]',
+      '[object Int16Array]',
+      '[object Uint16Array]',
+      '[object Int32Array]',
+      '[object Uint32Array]',
+      '[object Float32Array]',
+      '[object Float64Array]'
+    ];
+
+    var isDataView = function(obj) {
+      return obj && DataView.prototype.isPrototypeOf(obj)
+    };
+
+    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 {
+        throw new Error('unsupported BodyInit type')
+      }
+
+      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;
+      if (!body && input._bodyInit != null) {
+        body = input._bodyInit;
+        input.bodyUsed = true;
+      }
+    } else {
+      this.url = String(input);
+    }
+
+    this.credentials = options.credentials || this.credentials || 'omit';
+    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.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}})
+  };
+
+  self.Headers = Headers;
+  self.Request = Request;
+  self.Response = Response;
+
+  self.fetch = function(input, init) {
+    return new Promise(function(resolve, reject) {
+      var request = new Request(input, init);
+      var xhr = new XMLHttpRequest();
+
+      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.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);
+      });
+
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
+    })
+  };
+  self.fetch.polyfill = true;
+})(typeof self !== 'undefined' ? self : this);
+}).call(__root__, void(0));
+var fetch = __root__.fetch;
+var Response = fetch.Response = __root__.Response;
+var Request = fetch.Request = __root__.Request;
+var Headers = fetch.Headers = __root__.Headers;
+if (typeof module === 'object' && module.exports) {
+module.exports = fetch;
+}

node_modules/cross-fetch/dist/node-polyfill.js

@@ -0,0 +1,12 @@
+var fetchNode = require('./node-ponyfill');
+var fetch = fetchNode.fetch.bind({});
+
+fetch.polyfill = true;
+
+if (!global.fetch) {
+  global.fetch = fetch;
+  global.Response = fetchNode.Response;
+  global.Headers = fetchNode.Headers;
+  global.Request = fetchNode.Request;
+}
+

node_modules/cross-fetch/dist/node-ponyfill.js

@@ -0,0 +1,22 @@
+var nodeFetch = require('node-fetch');
+var realFetch = nodeFetch.default || nodeFetch;
+
+var fetch = function (url, options) {
+  // Support schemaless URIs on the server for parity with the browser.
+  // Ex: //github.com/ -> https://github.com/
+  if (/^\/\//.test(url)) {
+    url = 'https:' + url;
+  }
+  return realFetch.call(this, url, options);
+};
+
+fetch.polyfill = false;
+
+module.exports = exports = fetch;
+exports.fetch = fetch;
+exports.Headers = nodeFetch.Headers;
+exports.Request = nodeFetch.Request;
+exports.Response = nodeFetch.Response;
+
+// Needed for TypeScript.
+exports.default = fetch;

node_modules/cross-fetch/index.d.ts

@@ -0,0 +1,12 @@
+declare const fet: typeof fetch;
+declare const req: typeof Request;
+declare const res: typeof Response;
+declare const headers: typeof Headers;
+
+declare module "cross-fetch" {
+  export const fetch: typeof fet;
+  export const Request: typeof req;
+  export const Response: typeof res;
+  export const Headers: typeof headers;
+  export default fetch;
+}

node_modules/cross-fetch/node_modules/node-fetch/CHANGELOG.md

@@ -0,0 +1,219 @@
+
+Changelog
+=========
+
+
+# 2.x release
+
+## v2.1.2
+
+- Fix: allow `Body` methods to work on ArrayBuffer`-backed `Body` objects
+- Fix: reject promise returned by `Body` methods when the accumulated `Buffer` exceeds the maximum size
+- Fix: support custom `Host` headers with any casing
+- Fix: support importing `fetch()` from TypeScript in `browser.js`
+- Fix: handle the redirect response body properly
+
+## v2.1.1
+
+Fix packaging errors in v2.1.0.
+
+## v2.1.0
+
+- Enhance: allow using ArrayBuffer as the `body` of a `fetch()` or `Request`
+- Fix: store HTTP headers of a `Headers` object internally with the given case, for compatibility with older servers that incorrectly treated header names in a case-sensitive manner
+- Fix: silently ignore invalid HTTP headers
+- Fix: handle HTTP redirect responses without a `Location` header just like non-redirect responses
+- Fix: include bodies when following a redirection when appropriate
+
+## v2.0.0
+
+This is a major release. Check [our upgrade guide](https://github.com/bitinn/node-fetch/blob/master/UPGRADE-GUIDE.md) for an overview on some key differences between v1 and v2.
+
+### General changes
+
+- Major: Node.js 0.10.x and 0.12.x support is dropped
+- Major: `require('node-fetch/lib/response')` etc. is now unsupported; use `require('node-fetch').Response` or ES6 module imports
+- Enhance: start testing on Node.js v4.x, v6.x, v8.x LTS, as well as v9.x stable
+- Enhance: use Rollup to produce a distributed bundle (less memory overhead and faster startup)
+- Enhance: make `Object.prototype.toString()` on Headers, Requests, and Responses return correct class strings
+- Other: rewrite in ES2015 using Babel
+- Other: use Codecov for code coverage tracking
+- Other: update package.json script for npm 5
+- Other: `encoding` module is now optional (alpha.7)
+- Other: expose browser.js through package.json, avoid bundling mishaps (alpha.9)
+- Other: allow TypeScript to `import` node-fetch by exposing default (alpha.9)
+
+### HTTP requests
+
+- Major: overwrite user's `Content-Length` if we can be sure our information is correct (per spec)
+- Fix: errors in a response are caught before the body is accessed
+- Fix: support WHATWG URL objects, created by `whatwg-url` package or `require('url').URL` in Node.js 7+
+
+### Response and Request classes
+
+- Major: `response.text()` no longer attempts to detect encoding, instead always opting for UTF-8 (per spec); use `response.textConverted()` for the v1 behavior
+- Major: make `response.json()` throw error instead of returning an empty object on 204 no-content respose (per spec; reverts behavior changed in v1.6.2)
+- Major: internal methods are no longer exposed
+- Major: throw error when a `GET` or `HEAD` Request is constructed with a non-null body (per spec)
+- Enhance: add `response.arrayBuffer()` (also applies to Requests)
+- Enhance: add experimental `response.blob()` (also applies to Requests)
+- Enhance: `URLSearchParams` is now accepted as a body
+- Enhance: wrap `response.json()` json parsing error as `FetchError`
+- Fix: fix Request and Response with `null` body
+
+### Headers class
+
+- Major: remove `headers.getAll()`; make `get()` return all headers delimited by commas (per spec)
+- Enhance: make Headers iterable
+- Enhance: make Headers constructor accept an array of tuples
+- Enhance: make sure header names and values are valid in HTTP
+- Fix: coerce Headers prototype function parameters to strings, where applicable
+
+### Documentation
+
+- Enhance: more comprehensive API docs
+- Enhance: add a list of default headers in README
+
+
+# 1.x release
+
+## backport releases (v1.7.0 and beyond)
+
+See [changelog on 1.x branch](https://github.com/bitinn/node-fetch/blob/1.x/CHANGELOG.md) for details.
+
+## v1.6.3
+
+- Enhance: error handling document to explain `FetchError` design
+- Fix: support `form-data` 2.x releases (requires `form-data` >= 2.1.0)
+
+## v1.6.2
+
+- Enhance: minor document update
+- Fix: response.json() returns empty object on 204 no-content response instead of throwing a syntax error
+
+## v1.6.1
+
+- Fix: if `res.body` is a non-stream non-formdata object, we will call `body.toString` and send it as a string
+- Fix: `counter` value is incorrectly set to `follow` value when wrapping Request instance
+- Fix: documentation update
+
+## v1.6.0
+
+- Enhance: added `res.buffer()` api for convenience, it returns body as a Node.js buffer
+- Enhance: better old server support by handling raw deflate response
+- Enhance: skip encoding detection for non-HTML/XML response
+- Enhance: minor document update
+- Fix: HEAD request doesn't need decompression, as body is empty
+- Fix: `req.body` now accepts a Node.js buffer
+
+## v1.5.3
+
+- Fix: handle 204 and 304 responses when body is empty but content-encoding is gzip/deflate
+- Fix: allow resolving response and cloned response in any order
+- Fix: avoid setting `content-length` when `form-data` body use streams
+- Fix: send DELETE request with content-length when body is present
+- Fix: allow any url when calling new Request, but still reject non-http(s) url in fetch
+
+## v1.5.2
+
+- Fix: allow node.js core to handle keep-alive connection pool when passing a custom agent
+
+## v1.5.1
+
+- Fix: redirect mode `manual` should work even when there is no redirection or broken redirection
+
+## v1.5.0
+
+- Enhance: rejected promise now use custom `Error` (thx to @pekeler)
+- Enhance: `FetchError` contains `err.type` and `err.code`, allows for better error handling (thx to @pekeler)
+- Enhance: basic support for redirect mode `manual` and `error`, allows for location header extraction (thx to @jimmywarting for the initial PR)
+
+## v1.4.1
+
+- Fix: wrapping Request instance with FormData body again should preserve the body as-is
+
+## v1.4.0
+
+- Enhance: Request and Response now have `clone` method (thx to @kirill-konshin for the initial PR)
+- Enhance: Request and Response now have proper string and buffer body support (thx to @kirill-konshin)
+- Enhance: Body constructor has been refactored out (thx to @kirill-konshin)
+- Enhance: Headers now has `forEach` method (thx to @tricoder42)
+- Enhance: back to 100% code coverage
+- Fix: better form-data support (thx to @item4)
+- Fix: better character encoding detection under chunked encoding (thx to @dsuket for the initial PR)
+
+## v1.3.3
+
+- Fix: make sure `Content-Length` header is set when body is string for POST/PUT/PATCH requests
+- Fix: handle body stream error, for cases such as incorrect `Content-Encoding` header
+- Fix: when following certain redirects, use `GET` on subsequent request per Fetch Spec
+- Fix: `Request` and `Response` constructors now parse headers input using `Headers`
+
+## v1.3.2
+
+- Enhance: allow auto detect of form-data input (no `FormData` spec on node.js, this is form-data specific feature)
+
+## v1.3.1
+
+- Enhance: allow custom host header to be set (server-side only feature, as it's a forbidden header on client-side)
+
+## v1.3.0
+
+- Enhance: now `fetch.Request` is exposed as well
+
+## v1.2.1
+
+- Enhance: `Headers` now normalized `Number` value to `String`, prevent common mistakes
+
+## v1.2.0
+
+- Enhance: now fetch.Headers and fetch.Response are exposed, making testing easier
+
+## v1.1.2
+
+- Fix: `Headers` should only support `String` and `Array` properties, and ignore others
+
+## v1.1.1
+
+- Enhance: now req.headers accept both plain object and `Headers` instance
+
+## v1.1.0
+
+- Enhance: timeout now also applies to response body (in case of slow response)
+- Fix: timeout is now cleared properly when fetch is done/has failed
+
+## v1.0.6
+
+- Fix: less greedy content-type charset matching
+
+## v1.0.5
+
+- Fix: when `follow = 0`, fetch should not follow redirect
+- Enhance: update tests for better coverage
+- Enhance: code formatting
+- Enhance: clean up doc
+
+## v1.0.4
+
+- Enhance: test iojs support
+- Enhance: timeout attached to socket event only fire once per redirect
+
+## v1.0.3
+
+- Fix: response size limit should reject large chunk
+- Enhance: added character encoding detection for xml, such as rss/atom feed (encoding in DTD)
+
+## v1.0.2
+
+- Fix: added res.ok per spec change
+
+## v1.0.0
+
+- Enhance: better test coverage and doc
+
+
+# 0.x release
+
+## v0.1
+
+- Major: initial public release

node_modules/cross-fetch/node_modules/node-fetch/LICENSE.md

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 David Frank
+
+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.
+

node_modules/cross-fetch/node_modules/node-fetch/README.md

@@ -0,0 +1,409 @@
+
+node-fetch
+==========
+
+[![npm stable version][npm-image]][npm-url]
+[![npm next version][npm-next-image]][npm-url]
+[![build status][travis-image]][travis-url]
+[![coverage status][codecov-image]][codecov-url]
+
+A light-weight module that brings `window.fetch` to Node.js
+
+
+## Motivation
+
+Instead of implementing `XMLHttpRequest` in Node.js to run browser-specific [Fetch polyfill](https://github.com/github/fetch), why not go from native `http` to `fetch` API directly? Hence `node-fetch`, minimal code for a `window.fetch` compatible API on Node.js runtime.
+
+See Matt Andrews' [isomorphic-fetch](https://github.com/matthew-andrews/isomorphic-fetch) or Leonardo Quixada's [cross-fetch](https://github.com/lquixada/cross-fetch) for isomorphic usage (exports `node-fetch` for server-side, `whatwg-fetch` for client-side).
+
+
+## Features
+
+- Stay consistent with `window.fetch` API.
+- Make conscious trade-off when following [whatwg fetch spec][whatwg-fetch] and [stream spec](https://streams.spec.whatwg.org/) implementation details, document known difference.
+- Use native promise, but allow substituting it with [insert your favorite promise library].
+- Use native stream for body, on both request and response.
+- Decode content encoding (gzip/deflate) properly, convert `res.text()` output to UTF-8 optionally.
+- Useful extensions such as timeout, redirect limit, response size limit, [explicit errors][ERROR-HANDLING.md] for troubleshooting.
+
+
+## Difference from client-side fetch
+
+- See [Known Differences][LIMITS.md] for details.
+- If you happen to use a missing feature that `window.fetch` offers, feel free to open an issue.
+- Pull requests are welcomed too!
+
+
+## Install
+
+Stable release (`2.x`)
+
+```sh
+$ npm install node-fetch --save
+```
+
+## Usage
+
+Note that documentation below is up-to-date with `2.x` releases, [see `1.x` readme](https://github.com/bitinn/node-fetch/blob/1.x/README.md), [changelog](https://github.com/bitinn/node-fetch/blob/1.x/CHANGELOG.md) and [2.x upgrade guide][UPGRADE-GUIDE.md] if you want to find out the difference.
+
+```javascript
+import fetch from 'node-fetch';
+// or
+// const fetch = require('node-fetch');
+
+// if you are using your own Promise library, set it through fetch.Promise. Eg.
+
+// import Bluebird from 'bluebird';
+// fetch.Promise = Bluebird;
+
+// plain text or html
+
+fetch('https://github.com/')
+	.then(res => res.text())
+	.then(body => console.log(body));
+
+// json
+
+fetch('https://api.github.com/users/github')
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// catching network error
+// 3xx-5xx responses are NOT network errors, and should be handled in then()
+// you only need one catch() at the end of your promise chain
+
+fetch('http://domain.invalid/')
+	.catch(err => console.error(err));
+
+// stream
+// the node.js way is to use stream when possible
+
+fetch('https://assets-cdn.github.com/images/modules/logos_page/Octocat.png')
+	.then(res => {
+		const dest = fs.createWriteStream('./octocat.png');
+		res.body.pipe(dest);
+	});
+
+// buffer
+// if you prefer to cache binary data in full, use buffer()
+// note that buffer() is a node-fetch only API
+
+import fileType from 'file-type';
+
+fetch('https://assets-cdn.github.com/images/modules/logos_page/Octocat.png')
+	.then(res => res.buffer())
+	.then(buffer => fileType(buffer))
+	.then(type => { /* ... */ });
+
+// meta
+
+fetch('https://github.com/')
+	.then(res => {
+		console.log(res.ok);
+		console.log(res.status);
+		console.log(res.statusText);
+		console.log(res.headers.raw());
+		console.log(res.headers.get('content-type'));
+	});
+
+// post
+
+fetch('http://httpbin.org/post', { method: 'POST', body: 'a=1' })
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// post with stream from file
+
+import { createReadStream } from 'fs';
+
+const stream = createReadStream('input.txt');
+fetch('http://httpbin.org/post', { method: 'POST', body: stream })
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// post with JSON
+
+var body = { a: 1 };
+fetch('http://httpbin.org/post', { 
+	method: 'POST',
+	body:    JSON.stringify(body),
+	headers: { 'Content-Type': 'application/json' },
+})
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// post form parameters (x-www-form-urlencoded)
+
+import { URLSearchParams } from 'url';
+
+const params = new URLSearchParams();
+params.append('a', 1);
+fetch('http://httpbin.org/post', { method: 'POST', body: params })
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// post with form-data (detect multipart)
+
+import FormData from 'form-data';
+
+const form = new FormData();
+form.append('a', 1);
+fetch('http://httpbin.org/post', { method: 'POST', body: form })
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// post with form-data (custom headers)
+// note that getHeaders() is non-standard API
+
+import FormData from 'form-data';
+
+const form = new FormData();
+form.append('a', 1);
+fetch('http://httpbin.org/post', { method: 'POST', body: form, headers: form.getHeaders() })
+	.then(res => res.json())
+	.then(json => console.log(json));
+
+// node 7+ with async function
+
+(async function () {
+	const res = await fetch('https://api.github.com/users/github');
+	const json = await res.json();
+	console.log(json);
+})();
+```
+
+See [test cases](https://github.com/bitinn/node-fetch/blob/master/test/test.js) for more examples.
+
+
+## API
+
+### fetch(url[, options])
+
+- `url` A string representing the URL for fetching
+- `options` [Options](#fetch-options) for the HTTP(S) request
+- Returns: <code>Promise&lt;[Response](#class-response)&gt;</code>
+
+Perform an HTTP(S) fetch.
+
+`url` should be an absolute url, such as `http://example.com/`. A path-relative URL (`/file/under/root`) or protocol-relative URL (`//can-be-http-or-https.com/`) will result in a rejected promise.
+
+<a id="fetch-options"></a>
+#### Options
+
+The default values are shown after each option key.
+
+```js
+{
+	// These properties are part of the Fetch Standard
+	method: 'GET',
+	headers: {},        // request headers. format is the identical to that accepted by the Headers constructor (see below)
+	body: null,         // request body. can be null, a string, a Buffer, a Blob, or a Node.js Readable stream
+	redirect: 'follow', // set to `manual` to extract redirect headers, `error` to reject redirect
+
+	// The following properties are node-fetch extensions
+	follow: 20,         // maximum redirect count. 0 to not follow redirect
+	timeout: 0,         // req/res timeout in ms, it resets on redirect. 0 to disable (OS limit applies)
+	compress: true,     // support gzip/deflate content encoding. false to disable
+	size: 0,            // maximum response body size in bytes. 0 to disable
+	agent: null         // http(s).Agent instance, allows custom proxy, certificate etc.
+}
+```
+
+##### Default Headers
+
+If no values are set, the following request headers will be sent automatically:
+
+Header            | Value
+----------------- | --------------------------------------------------------
+`Accept-Encoding` | `gzip,deflate` _(when `options.compress === true`)_
+`Accept`          | `*/*`
+`Connection`      | `close` _(when no `options.agent` is present)_
+`Content-Length`  | _(automatically calculated, if possible)_
+`User-Agent`      | `node-fetch/1.0 (+https://github.com/bitinn/node-fetch)`
+
+<a id="class-request"></a>
+### Class: Request
+
+An HTTP(S) request containing information about URL, method, headers, and the body. This class implements the [Body](#iface-body) interface.
+
+Due to the nature of Node.js, the following properties are not implemented at this moment:
+
+- `type`
+- `destination`
+- `referrer`
+- `referrerPolicy`
+- `mode`
+- `credentials`
+- `cache`
+- `integrity`
+- `keepalive`
+
+The following node-fetch extension properties are provided:
+
+- `follow`
+- `compress`
+- `counter`
+- `agent`
+
+See [options](#fetch-options) for exact meaning of these extensions.
+
+#### new Request(input[, options])
+
+<small>*(spec-compliant)*</small>
+
+- `input` A string representing a URL, or another `Request` (which will be cloned)
+- `options` [Options][#fetch-options] for the HTTP(S) request
+
+Constructs a new `Request` object. The constructor is identical to that in the [browser](https://developer.mozilla.org/en-US/docs/Web/API/Request/Request).
+
+In most cases, directly `fetch(url, options)` is simpler than creating a `Request` object.
+
+<a id="class-response"></a>
+### Class: Response
+
+An HTTP(S) response. This class implements the [Body](#iface-body) interface.
+
+The following properties are not implemented in node-fetch at this moment:
+
+- `Response.error()`
+- `Response.redirect()`
+- `type`
+- `redirected`
+- `trailer`
+
+#### new Response([body[, options]])
+
+<small>*(spec-compliant)*</small>
+
+- `body` A string or [Readable stream][node-readable]
+- `options` A [`ResponseInit`][response-init] options dictionary
+
+Constructs a new `Response` object. The constructor is identical to that in the [browser](https://developer.mozilla.org/en-US/docs/Web/API/Response/Response).
+
+Because Node.js does not implement service workers (for which this class was designed), one rarely has to construct a `Response` directly.
+
+#### response.ok
+
+Convenience property representing if the request ended normally. Will evaluate to true if the response status was greater than or equal to 200 but smaller than 300.
+
+<a id="class-headers"></a>
+### Class: Headers
+
+This class allows manipulating and iterating over a set of HTTP headers. All methods specified in the [Fetch Standard][whatwg-fetch] are implemented.
+
+#### new Headers([init])
+
+<small>*(spec-compliant)*</small>
+
+- `init` Optional argument to pre-fill the `Headers` object
+
+Construct a new `Headers` object. `init` can be either `null`, a `Headers` object, an key-value map object, or any iterable object.
+
+```js
+// Example adapted from https://fetch.spec.whatwg.org/#example-headers-class
+
+const meta = {
+  'Content-Type': 'text/xml',
+  'Breaking-Bad': '<3'
+};
+const headers = new Headers(meta);
+
+// The above is equivalent to
+const meta = [
+  [ 'Content-Type', 'text/xml' ],
+  [ 'Breaking-Bad', '<3' ]
+];
+const headers = new Headers(meta);
+
+// You can in fact use any iterable objects, like a Map or even another Headers
+const meta = new Map();
+meta.set('Content-Type', 'text/xml');
+meta.set('Breaking-Bad', '<3');
+const headers = new Headers(meta);
+const copyOfHeaders = new Headers(headers);
+```
+
+<a id="iface-body"></a>
+### Interface: Body
+
+`Body` is an abstract interface with methods that are applicable to both `Request` and `Response` classes.
+
+The following methods are not yet implemented in node-fetch at this moment:
+
+- `formData()`
+
+#### body.body
+
+<small>*(deviation from spec)*</small>
+
+* Node.js [`Readable` stream][node-readable]
+
+The data encapsulated in the `Body` object. Note that while the [Fetch Standard][whatwg-fetch] requires the property to always be a WHATWG `ReadableStream`, in node-fetch it is a Node.js [`Readable` stream][node-readable].
+
+#### body.bodyUsed
+
+<small>*(spec-compliant)*</small>
+
+* `Boolean`
+
+A boolean property for if this body has been consumed. Per spec, a consumed body cannot be used again.
+
+#### body.arrayBuffer()
+#### body.blob()
+#### body.json()
+#### body.text()
+
+<small>*(spec-compliant)*</small>
+
+* Returns: <code>Promise</code>
+
+Consume the body and return a promise that will resolve to one of these formats.
+
+#### body.buffer()
+
+<small>*(node-fetch extension)*</small>
+
+* Returns: <code>Promise&lt;Buffer&gt;</code>
+
+Consume the body and return a promise that will resolve to a Buffer.
+
+#### body.textConverted()
+
+<small>*(node-fetch extension)*</small>
+
+* Returns: <code>Promise&lt;String&gt;</code>
+
+Identical to `body.text()`, except instead of always converting to UTF-8, encoding sniffing will be performed and text converted to UTF-8, if possible.
+
+<a id="class-fetcherror"></a>
+### Class: FetchError
+
+<small>*(node-fetch extension)*</small>
+
+An operational error in the fetching process. See [ERROR-HANDLING.md][] for more info.
+
+## License
+
+MIT
+
+
+## Acknowledgement
+
+Thanks to [github/fetch](https://github.com/github/fetch) for providing a solid implementation reference.
+
+
+[npm-image]: https://img.shields.io/npm/v/node-fetch.svg?style=flat-square
+[npm-next-image]: https://img.shields.io/npm/v/node-fetch/next.svg?style=flat-square
+[npm-url]: https://www.npmjs.com/package/node-fetch
+[travis-image]: https://img.shields.io/travis/bitinn/node-fetch.svg?style=flat-square
+[travis-url]: https://travis-ci.org/bitinn/node-fetch
+[codecov-image]: https://img.shields.io/codecov/c/github/bitinn/node-fetch.svg?style=flat-square
+[codecov-url]: https://codecov.io/gh/bitinn/node-fetch
+
+[ERROR-HANDLING.md]: https://github.com/bitinn/node-fetch/blob/master/ERROR-HANDLING.md
+[LIMITS.md]: https://github.com/bitinn/node-fetch/blob/master/LIMITS.md
+[UPGRADE-GUIDE.md]: https://github.com/bitinn/node-fetch/blob/master/UPGRADE-GUIDE.md
+
+[whatwg-fetch]: https://fetch.spec.whatwg.org/
+[response-init]: https://fetch.spec.whatwg.org/#responseinit
+[node-readable]: https://nodejs.org/api/stream.html#stream_readable_streams

node_modules/cross-fetch/node_modules/node-fetch/browser.js

@@ -0,0 +1,8 @@
+module.exports = exports = window.fetch;
+
+// Needed for TypeScript and Webpack.
+exports.default = window.fetch.bind(window);
+
+exports.Headers = window.Headers;
+exports.Request = window.Request;
+exports.Response = window.Response;

node_modules/cross-fetch/node_modules/node-fetch/package.json

@@ -0,0 +1,89 @@
+{
+  "_from": "node-fetch@2.1.2",
+  "_id": "node-fetch@2.1.2",
+  "_inBundle": false,
+  "_integrity": "sha1-q4hOjn5X44qUR1POxwb3iNF2i7U=",
+  "_location": "/cross-fetch/node-fetch",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "version",
+    "registry": true,
+    "raw": "node-fetch@2.1.2",
+    "name": "node-fetch",
+    "escapedName": "node-fetch",
+    "rawSpec": "2.1.2",
+    "saveSpec": null,
+    "fetchSpec": "2.1.2"
+  },
+  "_requiredBy": [
+    "/cross-fetch"
+  ],
+  "_resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.1.2.tgz",
+  "_shasum": "ab884e8e7e57e38a944753cec706f788d1768bb5",
+  "_spec": "node-fetch@2.1.2",
+  "_where": "/Users/stefanfejes/Projects/30-seconds-of-python-code/node_modules/cross-fetch",
+  "author": {
+    "name": "David Frank"
+  },
+  "browser": "./browser.js",
+  "bugs": {
+    "url": "https://github.com/bitinn/node-fetch/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {},
+  "deprecated": false,
+  "description": "A light-weight module that brings window.fetch to node.js",
+  "devDependencies": {
+    "babel-core": "^6.26.0",
+    "babel-plugin-istanbul": "^4.1.5",
+    "babel-preset-env": "^1.6.1",
+    "babel-register": "^6.16.3",
+    "chai": "^3.5.0",
+    "chai-as-promised": "^7.1.1",
+    "chai-iterator": "^1.1.1",
+    "chai-string": "^1.3.0",
+    "codecov": "^3.0.0",
+    "cross-env": "^5.1.3",
+    "form-data": "^2.3.1",
+    "mocha": "^5.0.0",
+    "nyc": "^11.4.1",
+    "parted": "^0.1.1",
+    "promise": "^8.0.1",
+    "resumer": "0.0.0",
+    "rollup": "^0.55.1",
+    "rollup-plugin-babel": "^3.0.3",
+    "string-to-arraybuffer": "^1.0.0",
+    "url-search-params": "^0.10.0",
+    "whatwg-url": "^5.0.0"
+  },
+  "engines": {
+    "node": "4.x || >=6.0.0"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/index.es.js",
+    "browser.js"
+  ],
+  "homepage": "https://github.com/bitinn/node-fetch",
+  "keywords": [
+    "fetch",
+    "http",
+    "promise"
+  ],
+  "license": "MIT",
+  "main": "lib/index.js",
+  "module": "lib/index.es.js",
+  "name": "node-fetch",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/bitinn/node-fetch.git"
+  },
+  "scripts": {
+    "build": "cross-env BABEL_ENV=rollup rollup -c",
+    "coverage": "cross-env BABEL_ENV=coverage nyc --reporter json --reporter text mocha -R spec test/test.js && codecov -f coverage/coverage-final.json",
+    "prepare": "npm run build",
+    "report": "cross-env BABEL_ENV=coverage nyc --reporter lcov --reporter text mocha -R spec test/test.js",
+    "test": "cross-env BABEL_ENV=test mocha --compilers js:babel-register test/test.js"
+  },
+  "version": "2.1.2"
+}

node_modules/cross-fetch/node_modules/whatwg-fetch/LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2014-2016 GitHub, Inc.
+
+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.

node_modules/cross-fetch/node_modules/whatwg-fetch/README.md

@@ -0,0 +1,283 @@
+# window.fetch polyfill
+
+The `fetch()` function is a Promise-based mechanism for programmatically making
+web requests in the browser. This project is a polyfill that implements a subset
+of the standard [Fetch specification][], enough to make `fetch` a viable
+replacement for most uses of XMLHttpRequest in traditional web applications.
+
+This project adheres to the [Open Code of Conduct][]. By participating, you are
+expected to uphold this code.
+
+## Table of Contents
+
+* [Read this first](#read-this-first)
+* [Installation](#installation)
+* [Usage](#usage)
+  * [HTML](#html)
+  * [JSON](#json)
+  * [Response metadata](#response-metadata)
+  * [Post form](#post-form)
+  * [Post JSON](#post-json)
+  * [File upload](#file-upload)
+  * [Caveats](#caveats)
+    * [Handling HTTP error statuses](#handling-http-error-statuses)
+    * [Sending cookies](#sending-cookies)
+    * [Receiving cookies](#receiving-cookies)
+    * [Obtaining the Response URL](#obtaining-the-response-url)
+* [Browser Support](#browser-support)
+
+## Read this first
+
+* If you believe you found a bug with how `fetch` behaves in Chrome or Firefox,
+  please **don't open an issue in this repository**. This project is a
+  _polyfill_, and since Chrome and Firefox both implement the `window.fetch`
+  function natively, no code from this project actually takes any effect in
+  these browsers. See [Browser support](#browser-support) for detailed
+  information.
+
+* If you have trouble **making a request to another domain** (a different
+  subdomain or port number also constitutes another domain), please familiarize
+  yourself with all the intricacies and limitations of [CORS][] requests.
+  Because CORS requires participation of the server by implementing specific
+  HTTP response headers, it is often nontrivial to set up or debug. CORS is
+  exclusively handled by the browser's internal mechanisms which this polyfill
+  cannot influence.
+
+* If you have trouble **maintaining the user's session** or [CSRF][] protection
+  through `fetch` requests, please ensure that you've read and understood the
+  [Sending cookies](#sending-cookies) section. `fetch` doesn't send cookies
+  unless you ask it to.
+
+* This project **doesn't work under Node.js environments**. It's meant for web
+  browsers only. You should ensure that your application doesn't try to package
+  and run this on the server.
+
+* If you have an idea for a new feature of `fetch`, **submit your feature
+  requests** to the [specification's repository](https://github.com/whatwg/fetch/issues).
+  We only add features and APIs that are part of the [Fetch specification][].
+
+## Installation
+
+* `npm install whatwg-fetch --save`; or
+
+* `bower install fetch`; or
+
+* `yarn add whatwg-fetch`.
+
+You will also need a Promise polyfill for [older browsers](http://caniuse.com/#feat=promises).
+We recommend [taylorhakes/promise-polyfill](https://github.com/taylorhakes/promise-polyfill)
+for its small size and Promises/A+ compatibility.
+
+For use with webpack, add this package in the `entry` configuration option
+before your application entry point:
+
+```javascript
+entry: ['whatwg-fetch', ...]
+```
+
+For Babel and ES2015+, make sure to import the file:
+
+```javascript
+import 'whatwg-fetch'
+```
+
+## Usage
+
+For a more comprehensive API reference that this polyfill supports, refer to
+https://github.github.io/fetch/.
+
+### HTML
+
+```javascript
+fetch('/users.html')
+  .then(function(response) {
+    return response.text()
+  }).then(function(body) {
+    document.body.innerHTML = body
+  })
+```
+
+### JSON
+
+```javascript
+fetch('/users.json')
+  .then(function(response) {
+    return response.json()
+  }).then(function(json) {
+    console.log('parsed json', json)
+  }).catch(function(ex) {
+    console.log('parsing failed', ex)
+  })
+```
+
+### Response metadata
+
+```javascript
+fetch('/users.json').then(function(response) {
+  console.log(response.headers.get('Content-Type'))
+  console.log(response.headers.get('Date'))
+  console.log(response.status)
+  console.log(response.statusText)
+})
+```
+
+### Post form
+
+```javascript
+var form = document.querySelector('form')
+
+fetch('/users', {
+  method: 'POST',
+  body: new FormData(form)
+})
+```
+
+### Post JSON
+
+```javascript
+fetch('/users', {
+  method: 'POST',
+  headers: {
+    'Content-Type': 'application/json'
+  },
+  body: JSON.stringify({
+    name: 'Hubot',
+    login: 'hubot',
+  })
+})
+```
+
+### File upload
+
+```javascript
+var input = document.querySelector('input[type="file"]')
+
+var data = new FormData()
+data.append('file', input.files[0])
+data.append('user', 'hubot')
+
+fetch('/avatars', {
+  method: 'POST',
+  body: data
+})
+```
+
+### Caveats
+
+The `fetch` specification differs from `jQuery.ajax()` in mainly two ways that
+bear keeping in mind:
+
+* The Promise returned from `fetch()` **won't reject on HTTP error status**
+  even if the response is an HTTP 404 or 500. Instead, it will resolve normally,
+  and it will only reject on network failure or if anything prevented the
+  request from completing.
+
+* By default, `fetch` **won't send or receive any cookies** from the server,
+  resulting in unauthenticated requests if the site relies on maintaining a user
+  session. See [Sending cookies](#sending-cookies) for how to opt into cookie
+  handling.
+
+#### Handling HTTP error statuses
+
+To have `fetch` Promise reject on HTTP error statuses, i.e. on any non-2xx
+status, define a custom response handler:
+
+```javascript
+function checkStatus(response) {
+  if (response.status >= 200 && response.status < 300) {
+    return response
+  } else {
+    var error = new Error(response.statusText)
+    error.response = response
+    throw error
+  }
+}
+
+function parseJSON(response) {
+  return response.json()
+}
+
+fetch('/users')
+  .then(checkStatus)
+  .then(parseJSON)
+  .then(function(data) {
+    console.log('request succeeded with JSON response', data)
+  }).catch(function(error) {
+    console.log('request failed', error)
+  })
+```
+
+#### Sending cookies
+
+To automatically send cookies for the current domain, the `credentials` option
+must be provided:
+
+```javascript
+fetch('/users', {
+  credentials: 'same-origin'
+})
+```
+
+The "same-origin" value makes `fetch` behave similarly to XMLHttpRequest with
+regards to cookies. Otherwise, cookies won't get sent, resulting in these
+requests not preserving the authentication session.
+
+For [CORS][] requests, use the "include" value to allow sending credentials to
+other domains:
+
+```javascript
+fetch('https://example.com:1234/users', {
+  credentials: 'include'
+})
+```
+
+#### Receiving cookies
+
+As with XMLHttpRequest, the `Set-Cookie` response header returned from the
+server is a [forbidden header name][] and therefore can't be programmatically
+read with `response.headers.get()`. Instead, it's the browser's responsibility
+to handle new cookies being set (if applicable to the current URL). Unless they
+are HTTP-only, new cookies will be available through `document.cookie`.
+
+Bear in mind that the default behavior of `fetch` is to ignore the `Set-Cookie`
+header completely. To opt into accepting cookies from the server, you must use
+the `credentials` option.
+
+#### Obtaining the Response URL
+
+Due to limitations of XMLHttpRequest, the `response.url` value might not be
+reliable after HTTP redirects on older browsers.
+
+The solution is to configure the server to set the response HTTP header
+`X-Request-URL` to the current URL after any redirect that might have happened.
+It should be safe to set it unconditionally.
+
+``` ruby
+# Ruby on Rails controller example
+response.headers['X-Request-URL'] = request.url
+```
+
+This server workaround is necessary if you need reliable `response.url` in
+Firefox < 32, Chrome < 37, Safari, or IE.
+
+## Browser Support
+
+- Chrome
+- Firefox
+- Safari 6.1+
+- Internet Explorer 10+
+
+Note: modern browsers such as Chrome, Firefox, Microsoft Edge, and Safari contain native
+implementations of `window.fetch`, therefore the code from this polyfill doesn't
+have any effect on those browsers. If you believe you've encountered an error
+with how `window.fetch` is implemented in any of these browsers, you should file
+an issue with that browser vendor instead of this project.
+
+
+  [fetch specification]: https://fetch.spec.whatwg.org
+  [open code of conduct]: http://todogroup.org/opencodeofconduct/#fetch/opensource@github.com
+  [cors]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
+    "Cross-origin resource sharing"
+  [csrf]: https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)_Prevention_Cheat_Sheet
+    "Cross-site request forgery"
+  [forbidden header name]: https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name

node_modules/cross-fetch/node_modules/whatwg-fetch/fetch.js

@@ -0,0 +1,466 @@
+(function(self) {
+  'use strict';
+
+  if (self.fetch) {
+    return
+  }
+
+  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
+  }
+
+  if (support.arrayBuffer) {
+    var viewClasses = [
+      '[object Int8Array]',
+      '[object Uint8Array]',
+      '[object Uint8ClampedArray]',
+      '[object Int16Array]',
+      '[object Uint16Array]',
+      '[object Int32Array]',
+      '[object Uint32Array]',
+      '[object Float32Array]',
+      '[object Float64Array]'
+    ]
+
+    var isDataView = function(obj) {
+      return obj && DataView.prototype.isPrototypeOf(obj)
+    }
+
+    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 {
+        throw new Error('unsupported BodyInit type')
+      }
+
+      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
+      if (!body && input._bodyInit != null) {
+        body = input._bodyInit
+        input.bodyUsed = true
+      }
+    } else {
+      this.url = String(input)
+    }
+
+    this.credentials = options.credentials || this.credentials || 'omit'
+    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.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}})
+  }
+
+  self.Headers = Headers
+  self.Request = Request
+  self.Response = Response
+
+  self.fetch = function(input, init) {
+    return new Promise(function(resolve, reject) {
+      var request = new Request(input, init)
+      var xhr = new XMLHttpRequest()
+
+      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.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)
+      })
+
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit)
+    })
+  }
+  self.fetch.polyfill = true
+})(typeof self !== 'undefined' ? self : this);

node_modules/cross-fetch/node_modules/whatwg-fetch/package.json

@@ -0,0 +1,55 @@
+{
+  "_from": "whatwg-fetch@2.0.4",
+  "_id": "whatwg-fetch@2.0.4",
+  "_inBundle": false,
+  "_integrity": "sha512-dcQ1GWpOD/eEQ97k66aiEVpNnapVj90/+R+SXTPYGHpYBBypfKJEQjLrvMZ7YXbKm21gXd4NcuxUTjiv1YtLng==",
+  "_location": "/cross-fetch/whatwg-fetch",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "version",
+    "registry": true,
+    "raw": "whatwg-fetch@2.0.4",
+    "name": "whatwg-fetch",
+    "escapedName": "whatwg-fetch",
+    "rawSpec": "2.0.4",
+    "saveSpec": null,
+    "fetchSpec": "2.0.4"
+  },
+  "_requiredBy": [
+    "/cross-fetch"
+  ],
+  "_resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
+  "_shasum": "dde6a5df315f9d39991aa17621853d720b85566f",
+  "_spec": "whatwg-fetch@2.0.4",
+  "_where": "/Users/stefanfejes/Projects/30-seconds-of-python-code/node_modules/cross-fetch",
+  "bugs": {
+    "url": "https://github.com/github/fetch/issues"
+  },
+  "bundleDependencies": false,
+  "deprecated": false,
+  "description": "A window.fetch polyfill.",
+  "devDependencies": {
+    "chai": "1.10.0",
+    "jshint": "2.8.0",
+    "mocha": "2.1.0",
+    "mocha-phantomjs-core": "2.0.1",
+    "promise-polyfill": "6.0.2",
+    "url-search-params": "0.6.1"
+  },
+  "files": [
+    "LICENSE",
+    "fetch.js"
+  ],
+  "homepage": "https://github.com/github/fetch#readme",
+  "license": "MIT",
+  "main": "fetch.js",
+  "name": "whatwg-fetch",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/github/fetch.git"
+  },
+  "scripts": {
+    "test": "make"
+  },
+  "version": "2.0.4"
+}

node_modules/cross-fetch/package.json

@@ -0,0 +1,111 @@
+{
+  "_from": "cross-fetch@2.2.2",
+  "_id": "cross-fetch@2.2.2",
+  "_inBundle": false,
+  "_integrity": "sha1-pH/09/xxLauo9qaVoRyUhEDUVyM=",
+  "_location": "/cross-fetch",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "version",
+    "registry": true,
+    "raw": "cross-fetch@2.2.2",
+    "name": "cross-fetch",
+    "escapedName": "cross-fetch",
+    "rawSpec": "2.2.2",
+    "saveSpec": null,
+    "fetchSpec": "2.2.2"
+  },
+  "_requiredBy": [
+    "/graphql-request"
+  ],
+  "_resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-2.2.2.tgz",
+  "_shasum": "a47ff4f7fc712daba8f6a695a11c948440d45723",
+  "_spec": "cross-fetch@2.2.2",
+  "_where": "/Users/stefanfejes/Projects/30-seconds-of-python-code/node_modules/graphql-request",
+  "author": {
+    "name": "Leonardo Quixada",
+    "email": "lquixada@gmail.com"
+  },
+  "browser": "dist/browser-ponyfill.js",
+  "bugs": {
+    "url": "https://github.com/lquixada/cross-fetch/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {
+    "node-fetch": "2.1.2",
+    "whatwg-fetch": "2.0.4"
+  },
+  "deprecated": false,
+  "description": "Universal WHATWG Fetch API for Node, Browsers and React Native",
+  "devDependencies": {
+    "chai": "4.1.2",
+    "codecov": "3.0.2",
+    "eslint": "4.19.1",
+    "husky": "0.14.3",
+    "lint-staged": "7.2.0",
+    "mocha": "5.2.0",
+    "mocha-headless-chrome": "2.0.0",
+    "nock": "9.3.3",
+    "nyc": "12.0.2",
+    "opn-cli": "3.1.0",
+    "ora": "2.1.0",
+    "rollup": "0.60.7",
+    "rollup-plugin-copy": "0.2.3",
+    "rollup-plugin-uglify": "4.0.0",
+    "sinon": "6.0.0",
+    "snyk": "1.83.0",
+    "webpack": "4.12.0",
+    "webpack-cli": "3.0.7"
+  },
+  "files": [
+    "dist",
+    "polyfill",
+    "index.d.ts"
+  ],
+  "homepage": "https://github.com/lquixada/cross-fetch",
+  "keywords": [
+    "fetch",
+    "isomorphic",
+    "universal",
+    "node",
+    "react",
+    "native",
+    "browser",
+    "ponyfill",
+    "whatwg",
+    "xhr",
+    "ajax"
+  ],
+  "license": "MIT",
+  "lint-staged": {
+    "*.js": [
+      "eslint --fix",
+      "git add"
+    ]
+  },
+  "main": "dist/node-ponyfill.js",
+  "name": "cross-fetch",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lquixada/cross-fetch.git"
+  },
+  "scripts": {
+    "build": "rollup -c",
+    "codecov": "nyc report --reporter=text-lcov > coverage.lcov && codecov",
+    "deploy:major": "npm version major && git push --follow-tags",
+    "deploy:minor": "npm version minor && git push --follow-tags",
+    "deploy:patch": "npm version patch && git push --follow-tags",
+    "lint": "eslint .",
+    "precommit": "npm run -s build && lint-staged",
+    "pretest:node:bundle": "webpack-cli --config test/webpack-node/webpack.config.js",
+    "sauce": "./tasks/sauce",
+    "security": "snyk test",
+    "test": "npm run -s test:headless && npm run -s test:node && npm run -s test:node:bundle && npm run -s lint",
+    "test:browser": "opn test/browser/index.html",
+    "test:headless": "mocha-headless-chrome -f test/browser/index.html -a no-sandbox -a disable-setuid-sandbox",
+    "test:node": "nyc mocha test/node/index.js",
+    "test:node:bundle": "nyc mocha test/webpack-node/bundle.js"
+  },
+  "typings": "index.d.ts",
+  "version": "2.2.2"
+}

node_modules/cross-fetch/polyfill/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "cross-fetch-polyfill",
+  "version": "0.0.0",
+  "main": "../dist/node-polyfill.js",
+  "browser": "../dist/browser-polyfill.js"
+}