resources/src/es5-skip.js

   1 /*!
   2  * Skip function for es5-shim module.
   3  *
   4  * Test for strict mode as a proxy for full ES5 function support (but not syntax)
   5  * Per http://kangax.github.io/compat-table/es5/ this is a reasonable shortcut
   6  * that still allows this to be as short as possible (there are no browsers we
   7  * support that have strict mode, but lack other features).
   8  *
   9  * Do explicitly test for Function#bind because of PhantomJS (which implements
  10  * strict mode, but lacks Function#bind).
  11  *
  12  * IE9 supports all features except strict mode, so loading es5-shim should be close to
  13  * a no-op but does increase page payload).
  14  */
  15 return ( function () {
  16         'use strict';
  17         return !this && !!Function.prototype.bind;
  18 }() );