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- '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;
- try {
- hasArrayLengthDefineBug = $defineProperty && $defineProperty([], 'length', { value: 1 }).length === 0;
- } catch (e) {
- // In Firefox 4-22, defining length on an array throws an exception.
- hasArrayLengthDefineBug = true;
- }
- // 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;
- };
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