'use strict'; var GetIntrinsic = require('../GetIntrinsic'); var $defineProperty = GetIntrinsic('%Object.defineProperty%'); 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; };