Add String.prototype.includes polyfill

Summary: Add a polyfill for `String.prototype.includes` taken from MDN (https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/includes) See #5727 Closes #5735 Reviewed By: svcscm Differential Revision: D2906667 Pulled By: vjeux fb-gh-sync-id: e02f605bf57171062b29a98b98ba9fc898cedfc2
facebook · Feb 5, 2016 · 2f73ad0 · 2f73ad0
1 parent d2ab6ca
commit 2f73ad0
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/packager/react-packager/src/Resolver/polyfills/String.prototype.es6.js b/packager/react-packager/src/Resolver/polyfills/String.prototype.es6.js
@@ -83,3 +83,18 @@ if (!String.prototype.repeat) {
     return result;
   };
 }
+
+if (!String.prototype.includes) {
+  String.prototype.includes = function(search, start) {
+    'use strict';
+    if (typeof start !== 'number') {
+      start = 0;
+    }
+
+    if (start + search.length > this.length) {
+      return false;
+    } else {
+      return this.indexOf(search, start) !== -1;
+    }
+  };
+}