32 lines
705 B
JavaScript
32 lines
705 B
JavaScript
'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var has = require('has');
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var $TypeError = GetIntrinsic('%TypeError%');
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module.exports = function IsPropertyDescriptor(ES, Desc) {
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if (ES.Type(Desc) !== 'Object') {
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return false;
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}
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var allowed = {
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'[[Configurable]]': true,
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'[[Enumerable]]': true,
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'[[Get]]': true,
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'[[Set]]': true,
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'[[Value]]': true,
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'[[Writable]]': true
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};
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for (var key in Desc) { // eslint-disable-line
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if (has(Desc, key) && !allowed[key]) {
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return false;
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}
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}
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if (ES.IsDataDescriptor(Desc) && ES.IsAccessorDescriptor(Desc)) {
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throw new $TypeError('Property Descriptors may not be both accessor and data descriptors');
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}
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return true;
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};
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