git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 module.exports = function () {
   4         var symbol;
   5         if (typeof Symbol !== 'function') return false;
   6         symbol = Symbol('test symbol');
   7         try { String(symbol); } catch (e) { return false; }
   8         if (typeof Symbol.iterator === 'symbol') return true;
   9
  10         // Return 'true' for polyfills
  11         if (typeof Symbol.isConcatSpreadable !== 'object') return false;
  12         if (typeof Symbol.iterator !== 'object') return false;
  13         if (typeof Symbol.toPrimitive !== 'object') return false;
  14         if (typeof Symbol.toStringTag !== 'object') return false;
  15         if (typeof Symbol.unscopables !== 'object') return false;
  16
  17         return true;
  18 };