| var has = require('../internals/has'); |
| var ownKeys = require('../internals/own-keys'); |
| var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor'); |
| var definePropertyModule = require('../internals/object-define-property'); |
| |
| module.exports = function (target, source) { |
| var keys = ownKeys(source); |
| var defineProperty = definePropertyModule.f; |
| var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f; |
| for (var i = 0; i < keys.length; i++) { |
| var key = keys[i]; |
| if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key)); |
| } |
| }; |