fix(ie11): add Array.prototype.find/findIndex polyfills (#115)

These two functions are part of ES2015 and are not present in IE11. In the migration we removed
closure compiler which was injecting these by default

Author: jshcrowthe

src/app.ts

@@ -13,6 +13,9 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
+// Import the needed shims
+import './utils/shims';
+
 // Import the createFirebaseNamespace function
 import { createFirebaseNamespace, FirebaseNamespace } from './app/firebase_app';
 

src/utils/shims.ts

@@ -0,0 +1,97 @@
+/**
+ * This is the Array.prototype.findIndex polyfill from MDN
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
+ * https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
+ */
+if (!Array.prototype.findIndex) {
+  Object.defineProperty(Array.prototype, 'findIndex', {
+    value: function(predicate) {
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var o = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(O, "length")).
+      var len = o.length >>> 0;
+
+      // 3. If IsCallable(predicate) is false, throw a TypeError exception.
+      if (typeof predicate !== 'function') {
+        throw new TypeError('predicate must be a function');
+      }
+
+      // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
+      var thisArg = arguments[1];
+
+      // 5. Let k be 0.
+      var k = 0;
+
+      // 6. Repeat, while k < len
+      while (k < len) {
+        // a. Let Pk be ! ToString(k).
+        // b. Let kValue be ? Get(O, Pk).
+        // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
+        // d. If testResult is true, return k.
+        var kValue = o[k];
+        if (predicate.call(thisArg, kValue, k, o)) {
+          return k;
+        }
+        // e. Increase k by 1.
+        k++;
+      }
+
+      // 7. Return -1.
+      return -1;
+    }
+  });
+}
+
+/**
+ * This is the Array.prototype.find polyfill from MDN
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
+ * https://tc39.github.io/ecma262/#sec-array.prototype.find
+ */
+if (!Array.prototype.find) {
+  Object.defineProperty(Array.prototype, 'find', {
+    value: function(predicate) {
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var o = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(O, "length")).
+      var len = o.length >>> 0;
+
+      // 3. If IsCallable(predicate) is false, throw a TypeError exception.
+      if (typeof predicate !== 'function') {
+        throw new TypeError('predicate must be a function');
+      }
+
+      // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
+      var thisArg = arguments[1];
+
+      // 5. Let k be 0.
+      var k = 0;
+
+      // 6. Repeat, while k < len
+      while (k < len) {
+        // a. Let Pk be ! ToString(k).
+        // b. Let kValue be ? Get(O, Pk).
+        // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
+        // d. If testResult is true, return kValue.
+        var kValue = o[k];
+        if (predicate.call(thisArg, kValue, k, o)) {
+          return kValue;
+        }
+        // e. Increase k by 1.
+        k++;
+      }
+
+      // 7. Return undefined.
+      return undefined;
+    }
+  });
+}