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