CreateDataProperty.js

'use strict';

var GetIntrinsic = require('../GetIntrinsic');

var $TypeError = GetIntrinsic('%TypeError%');

var DefineOwnProperty = require('../helpers/DefineOwnProperty');

var FromPropertyDescriptor = require('./FromPropertyDescriptor');
var OrdinaryGetOwnProperty = require('./OrdinaryGetOwnProperty');
var IsDataDescriptor = require('./IsDataDescriptor');
var IsExtensible = require('./IsExtensible');
var IsPropertyKey = require('./IsPropertyKey');
var SameValue = require('./SameValue');
var Type = require('./Type');

// https://www.ecma-international.org/ecma-262/6.0/#sec-createdataproperty

module.exports = function CreateDataProperty(O, P, V) {
	if (Type(O) !== 'Object') {
		throw new $TypeError('Assertion failed: Type(O) is not Object');
	}
	if (!IsPropertyKey(P)) {
		throw new $TypeError('Assertion failed: IsPropertyKey(P) is not true');
	}
	var oldDesc = OrdinaryGetOwnProperty(O, P);
	var extensible = !oldDesc || IsExtensible(O);
	var immutable = oldDesc && (!oldDesc['[[Writable]]'] || !oldDesc['[[Configurable]]']);
	if (immutable || !extensible) {
		return false;
	}
	return DefineOwnProperty(
		IsDataDescriptor,
		SameValue,
		FromPropertyDescriptor,
		O,
		P,
		{
			'[[Configurable]]': true,
			'[[Enumerable]]': true,
			'[[Value]]': V,
			'[[Writable]]': true
		}
	);
};