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47 lines
2.1 KiB
47 lines
2.1 KiB
4 years ago
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var $ = require('../internals/export');
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var anObject = require('../internals/an-object');
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var isObject = require('../internals/is-object');
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var has = require('../internals/has');
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var fails = require('../internals/fails');
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var definePropertyModule = require('../internals/object-define-property');
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var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
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var getPrototypeOf = require('../internals/object-get-prototype-of');
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var createPropertyDescriptor = require('../internals/create-property-descriptor');
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// `Reflect.set` method
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// https://tc39.github.io/ecma262/#sec-reflect.set
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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 ownDescriptor = getOwnPropertyDescriptorModule.f(anObject(target), propertyKey);
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var existingDescriptor, prototype;
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if (!ownDescriptor) {
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if (isObject(prototype = getPrototypeOf(target))) {
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return set(prototype, propertyKey, V, receiver);
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}
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ownDescriptor = createPropertyDescriptor(0);
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}
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if (has(ownDescriptor, 'value')) {
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if (ownDescriptor.writable === false || !isObject(receiver)) return false;
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if (existingDescriptor = getOwnPropertyDescriptorModule.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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definePropertyModule.f(receiver, propertyKey, existingDescriptor);
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} else definePropertyModule.f(receiver, propertyKey, createPropertyDescriptor(0, V));
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return true;
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}
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return ownDescriptor.set === undefined ? false : (ownDescriptor.set.call(receiver, V), true);
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}
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// MS Edge 17-18 Reflect.set allows setting the property to object
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// with non-writable property on the prototype
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var MS_EDGE_BUG = fails(function () {
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var Constructor = function () { /* empty */ };
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var object = definePropertyModule.f(new Constructor(), 'a', { configurable: true });
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// eslint-disable-next-line no-undef
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return Reflect.set(Constructor.prototype, 'a', 1, object) !== false;
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});
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$({ target: 'Reflect', stat: true, forced: MS_EDGE_BUG }, {
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set: set
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});
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