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

   1 // Workaround for http://code.google.com/p/v8/issues/detail?id=2804
   2
   3 'use strict';
   4
   5 var create = Object.create, shim;
   6
   7 if (!require('./set-prototype-of/is-implemented')()) {
   8         shim = require('./set-prototype-of/shim');
   9 }
  10
  11 module.exports = (function () {
  12         var nullObject, props, desc;
  13         if (!shim) return create;
  14         if (shim.level !== 1) return create;
  15
  16         nullObject = {};
  17         props = {};
  18         desc = { configurable: false, enumerable: false, writable: true,
  19                 value: undefined };
  20         Object.getOwnPropertyNames(Object.prototype).forEach(function (name) {
  21                 if (name === '__proto__') {
  22                         props[name] = { configurable: true, enumerable: false, writable: true,
  23                                 value: undefined };
  24                         return;
  25                 }
  26                 props[name] = desc;
  27         });
  28         Object.defineProperties(nullObject, props);
  29
  30         Object.defineProperty(shim, 'nullPolyfill', { configurable: false,
  31                 enumerable: false, writable: false, value: nullObject });
  32
  33         return function (prototype, props) {
  34                 return create((prototype === null) ? nullObject : prototype, props);
  35         };
  36 }());