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34 lines
1.3 KiB
JavaScript
34 lines
1.3 KiB
JavaScript
5 years ago
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// 26.1.13 Reflect.set(target, propertyKey, V [, receiver])
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var dP = require('./_object-dp');
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var gOPD = require('./_object-gopd');
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var getPrototypeOf = require('./_object-gpo');
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var has = require('./_has');
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var $export = require('./_export');
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var createDesc = require('./_property-desc');
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var anObject = require('./_an-object');
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var isObject = require('./_is-object');
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function set(target, propertyKey, V /* , receiver */) {
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var receiver = arguments.length < 4 ? target : arguments[3];
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var ownDesc = gOPD.f(anObject(target), propertyKey);
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var existingDescriptor, proto;
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if (!ownDesc) {
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if (isObject(proto = getPrototypeOf(target))) {
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return set(proto, propertyKey, V, receiver);
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}
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ownDesc = createDesc(0);
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}
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if (has(ownDesc, 'value')) {
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if (ownDesc.writable === false || !isObject(receiver)) return false;
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if (existingDescriptor = gOPD.f(receiver, propertyKey)) {
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if (existingDescriptor.get || existingDescriptor.set || existingDescriptor.writable === false) return false;
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existingDescriptor.value = V;
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dP.f(receiver, propertyKey, existingDescriptor);
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} else dP.f(receiver, propertyKey, createDesc(0, V));
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return true;
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}
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return ownDesc.set === undefined ? false : (ownDesc.set.call(receiver, V), true);
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}
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$export($export.S, 'Reflect', { set: set });
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