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63 lines
1.8 KiB
63 lines
1.8 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $defineProperty = GetIntrinsic('%Object.defineProperty%', true); |
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if ($defineProperty) { |
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try { |
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$defineProperty({}, 'a', { value: 1 }); |
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} catch (e) { |
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// IE 8 has a broken defineProperty |
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$defineProperty = null; |
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} |
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} |
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// node v0.6 has a bug where array lengths can be Set but not Defined |
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var hasArrayLengthDefineBug = Object.defineProperty && Object.defineProperty([], 'length', { value: 1 }).length === 0; |
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// eslint-disable-next-line global-require |
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var isArray = hasArrayLengthDefineBug && require('../2020/IsArray'); // this does not depend on any other AOs. |
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var callBound = require('call-bind/callBound'); |
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var $isEnumerable = callBound('Object.prototype.propertyIsEnumerable'); |
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// eslint-disable-next-line max-params |
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module.exports = function DefineOwnProperty(IsDataDescriptor, SameValue, FromPropertyDescriptor, O, P, desc) { |
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if (!$defineProperty) { |
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if (!IsDataDescriptor(desc)) { |
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// ES3 does not support getters/setters |
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return false; |
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} |
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if (!desc['[[Configurable]]'] || !desc['[[Writable]]']) { |
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return false; |
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} |
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// fallback for ES3 |
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if (P in O && $isEnumerable(O, P) !== !!desc['[[Enumerable]]']) { |
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// a non-enumerable existing property |
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return false; |
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} |
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// property does not exist at all, or exists but is enumerable |
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var V = desc['[[Value]]']; |
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// eslint-disable-next-line no-param-reassign |
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O[P] = V; // will use [[Define]] |
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return SameValue(O[P], V); |
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} |
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if ( |
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hasArrayLengthDefineBug |
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&& P === 'length' |
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&& '[[Value]]' in desc |
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&& isArray(O) |
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&& O.length !== desc['[[Value]]'] |
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) { |
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// eslint-disable-next-line no-param-reassign |
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O.length = desc['[[Value]]']; |
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return O.length === desc['[[Value]]']; |
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} |
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$defineProperty(O, P, FromPropertyDescriptor(desc)); |
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return true; |
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};
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