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node_modules/es-abstract/helpers/DefineOwnProperty.js
| 45 lines
| 1.2 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $defineProperty = GetIntrinsic('%Object.defineProperty%', true); | ||||
| if ($defineProperty) { | ||||
| try { | ||||
| $defineProperty({}, 'a', { value: 1 }); | ||||
| } catch (e) { | ||||
| // IE 8 has a broken defineProperty | ||||
| $defineProperty = null; | ||||
| } | ||||
| } | ||||
| var callBound = require('../helpers/callBound'); | ||||
| var $isEnumerable = callBound('Object.prototype.propertyIsEnumerable'); | ||||
| // eslint-disable-next-line max-params | ||||
| module.exports = function DefineOwnProperty(IsDataDescriptor, SameValue, FromPropertyDescriptor, O, P, desc) { | ||||
| if (!$defineProperty) { | ||||
| if (!IsDataDescriptor(desc)) { | ||||
| // ES3 does not support getters/setters | ||||
| return false; | ||||
| } | ||||
| if (!desc['[[Configurable]]'] || !desc['[[Writable]]']) { | ||||
| return false; | ||||
| } | ||||
| // fallback for ES3 | ||||
| if (P in O && $isEnumerable(O, P) !== !!desc['[[Enumerable]]']) { | ||||
| // a non-enumerable existing property | ||||
| return false; | ||||
| } | ||||
| // property does not exist at all, or exists but is enumerable | ||||
| var V = desc['[[Value]]']; | ||||
| // eslint-disable-next-line no-param-reassign | ||||
| O[P] = V; // will use [[Define]] | ||||
| return SameValue(O[P], V); | ||||
| } | ||||
| $defineProperty(O, P, FromPropertyDescriptor(desc)); | ||||
| return true; | ||||
| }; | ||||