diff --git a/Libraries/vendor/core/whatwg-fetch.js b/Libraries/vendor/core/whatwg-fetch.js
new file mode 100644
index 00000000000000..1b5603201686e3
--- /dev/null
+++ b/Libraries/vendor/core/whatwg-fetch.js
@@ -0,0 +1,520 @@
+// Fork of https://github.com/github/fetch/blob/master/fetch.js that does not
+// use reponseType: 'blob' by default. RN already has specific native implementations
+// for different response types so there is no need to add the extra blob overhead.
+
+// 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.
+
+(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;
+      }
+
+      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);
diff --git a/package.json b/package.json
index ce738d0198eda2..f615190404dd2e 100644
--- a/package.json
+++ b/package.json
@@ -193,7 +193,6 @@
     "serve-static": "^1.13.1",
     "shell-quote": "1.6.1",
     "stacktrace-parser": "^0.1.3",
-    "whatwg-fetch": "^1.0.0",
     "ws": "^1.1.0",
     "xcode": "^0.9.1",
     "xmldoc": "^0.4.0",