| 'use strict'; |
| |
| var GetIntrinsic = require('get-intrinsic'); |
| |
| var $defineProperty = GetIntrinsic('%Object.defineProperty%', true); |
| |
| if ($defineProperty) { |
| try { |
| $defineProperty({}, 'a', { value: 1 }); |
| } catch (e) { |
| // IE 8 has a broken defineProperty |
| $defineProperty = null; |
| } |
| } |
| |
| // node v0.6 has a bug where array lengths can be Set but not Defined |
| var hasArrayLengthDefineBug = Object.defineProperty && Object.defineProperty([], 'length', { value: 1 }).length === 0; |
| |
| // eslint-disable-next-line global-require |
| var isArray = hasArrayLengthDefineBug && require('../2020/IsArray'); // this does not depend on any other AOs. |
| |
| var callBound = require('call-bind/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); |
| } |
| if ( |
| hasArrayLengthDefineBug |
| && P === 'length' |
| && '[[Value]]' in desc |
| && isArray(O) |
| && O.length !== desc['[[Value]]'] |
| ) { |
| // eslint-disable-next-line no-param-reassign |
| O.length = desc['[[Value]]']; |
| return O.length === desc['[[Value]]']; |
| } |
| |
| $defineProperty(O, P, FromPropertyDescriptor(desc)); |
| return true; |
| }; |