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45 lines
2.1 KiB
45 lines
2.1 KiB
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 object = definePropertyModule.f({}, 'a', { configurable: true }); |
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// eslint-disable-next-line no-undef |
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return Reflect.set(getPrototypeOf(object), '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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