Fix whatwg-fetch 3.4 global object name change compatibility

.travis.yml

@@ -32,6 +32,7 @@ jobs:
       script:
         - yarn lint:js
         - yarn test
+        - PREFER_NATIVE=true yarn test
         - npm run test:node
 
     - name: "Floating Dependencies"

assets/browser-fetch.js.t

@@ -1,7 +1,7 @@
-(function (global) {
-  define('fetch', ['exports'], function(self) {
+(function (originalGlobal) {
+  define('fetch', ['exports'], function(exports) {
     'use strict';
-    var Promise = global.Ember.RSVP.Promise;
+    var Promise = originalGlobal.Ember.RSVP.Promise;
     var supportProps = [
       'FormData',
       'FileReader',
@@ -22,18 +22,24 @@
       combinedProps = supportProps.concat(polyfillProps);
     }
     combinedProps.forEach(function(prop) {
-      if (global[prop]) {
-        Object.defineProperty(self, prop, {
+      if (originalGlobal[prop]) {
+        Object.defineProperty(exports, prop, {
           configurable: true,
-          get: function() { return global[prop] },
-          set: function(v) { global[prop] = v }
+          get: function() { return originalGlobal[prop] },
+          set: function(v) { originalGlobal[prop] = v }
         });
       }
     });
 
+    // shadow github/fetch global object
+    // https://github.com/github/fetch/blob/v3.4.0/fetch.js
+    var globalThis =  exports;
+    // shadow mo/abortcontroller-polyfill global object
+    // https://github.com/mo/abortcontroller-polyfill/blob/v1.4.0/src/abortcontroller-polyfill.js
+    var self = exports;
     <%= moduleBody %>
 
-    if (!self.fetch) {
+    if (!globalThis.fetch) {
       throw new Error('fetch is not defined - maybe your browser targets are not covering everything you need?');
     }
 
@@ -43,15 +49,15 @@
       return result;
     }
 
-    if (global.Ember.Test) {
-      global.Ember.Test.registerWaiter(function() {
+    if (originalGlobal.Ember.Test) {
+      originalGlobal.Ember.Test.registerWaiter(function() {
         return pending === 0;
       });
 
-      self['default'] = function() {
+      exports['default'] = function() {
         pending++;
 
-        return self.fetch.apply(global, arguments).then(function(response){
+        return exports.fetch.apply(originalGlobal, arguments).then(function(response){
           response.clone().blob().then(decrement, decrement);
           return response;
         }, function(reason) {
@@ -60,10 +66,13 @@
         });
       };
     } else {
-      self['default'] = self.fetch;
+      exports['default'] = exports.fetch;
     }
     supportProps.forEach(function(prop) {
-      delete self[prop];
+      delete exports[prop];
     });
   });
-}(typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : this));
+}((typeof window !== 'undefined' && window) ||
+  (typeof globalThis !== 'undefined' && globalThis) ||
+  (typeof self !== 'undefined' && self) ||
+  (typeof global !== 'undefined' && global)));

ember-cli-build.js

@@ -6,7 +6,7 @@ module.exports = function(defaults) {
   let app = new EmberAddon(defaults, {
     // Add options here
     'ember-fetch': {
-      preferNative: true
+      preferNative: process.env.PREFER_NATIVE ? true : false
     }
   });
 

package.json

@@ -37,7 +37,7 @@
     "ember-cli-babel": "^7.19.0",
     "ember-cli-typescript": "^3.1.3",
     "node-fetch": "^2.6.0",
-    "whatwg-fetch": "^3.0.0"
+    "whatwg-fetch": "^3.4.0"
   },
   "devDependencies": {
     "@ember/optional-features": "^1.3.0",

yarn.lock

@@ -11120,7 +11120,7 @@ websocket-extensions@>=0.1.1:
   resolved "https://registry.yarnpkg.com/websocket-extensions/-/websocket-extensions-0.1.4.tgz#7f8473bc839dfd87608adb95d7eb075211578a42"
   integrity sha512-OqedPIGOfsDlo31UNwYbCFMSaO9m9G/0faIHj5/dZFDMFqPTcx6UwqyOy3COEaEOg/9VsGIpdqn62W5KhoKSpg==
 
-whatwg-fetch@^3.0.0:
+whatwg-fetch@^3.0.0, whatwg-fetch@^3.4.0:
   version "3.4.0"
   resolved "https://registry.yarnpkg.com/whatwg-fetch/-/whatwg-fetch-3.4.0.tgz#e11de14f4878f773fbebcde8871b2c0699af8b30"
   integrity sha512-rsum2ulz2iuZH08mJkT0Yi6JnKhwdw4oeyMjokgxd+mmqYSd9cPpOQf01TIWgjxG/U4+QR+AwKq6lSbXVxkyoQ==