'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; };