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47 lines
1.4 KiB
47 lines
1.4 KiB
4 years ago
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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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 hasProto = !({ __proto__: null } instanceof Object);
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// https://www.ecma-international.org/ecma-262/6.0/#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]]'];
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if (additionalInternalSlotsList.length > 0) {
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throw new $SyntaxError('es-abstract does not yet support internal slots');
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// internalSlotsList.push(...additionalInternalSlotsList);
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}
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// var O = MakeBasicObject(internalSlotsList);
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// setProto(O, proto);
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// return O;
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if ($ObjectCreate) {
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return $ObjectCreate(proto);
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}
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if (hasProto) {
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return { __proto__: proto };
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}
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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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return new T();
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};
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