57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $ObjectCreate = GetIntrinsic('%Object.create%', true);
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var $TypeError = GetIntrinsic('%TypeError%');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var IsArray = require('./IsArray');
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var Type = require('./Type');
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var forEach = require('../helpers/forEach');
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var SLOT = require('internal-slot');
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var hasProto = require('has-proto')();
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// https://262.ecma-international.org/11.0/#sec-objectcreate
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module.exports = function OrdinaryObjectCreate(proto) {
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if (proto !== null && Type(proto) !== 'Object') {
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throw new $TypeError('Assertion failed: `proto` must be null or an object');
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}
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var additionalInternalSlotsList = arguments.length < 2 ? [] : arguments[1];
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if (!IsArray(additionalInternalSlotsList)) {
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throw new $TypeError('Assertion failed: `additionalInternalSlotsList` must be an Array');
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}
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// var internalSlotsList = ['[[Prototype]]', '[[Extensible]]']; // step 1
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// internalSlotsList.push(...additionalInternalSlotsList); // step 2
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// var O = MakeBasicObject(internalSlotsList); // step 3
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// setProto(O, proto); // step 4
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// return O; // step 5
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var O;
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if ($ObjectCreate) {
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O = $ObjectCreate(proto);
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} else if (hasProto) {
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O = { __proto__: proto };
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} else {
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if (proto === null) {
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throw new $SyntaxError('native Object.create support is required to create null objects');
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}
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var T = function T() {};
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T.prototype = proto;
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O = new T();
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}
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if (additionalInternalSlotsList.length > 0) {
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forEach(additionalInternalSlotsList, function (slot) {
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SLOT.set(O, slot, void undefined);
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});
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}
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return O;
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};
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