| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var GetIntrinsic = require('get-intrinsic'); |
| 4 | |
| 5 | var $ObjectCreate = GetIntrinsic('%Object.create%', true); |
| 6 | var $TypeError = GetIntrinsic('%TypeError%'); |
| 7 | var $SyntaxError = GetIntrinsic('%SyntaxError%'); |
| 8 | |
| 9 | var Type = require('./Type'); |
| 10 | |
| 11 | var hasProto = !({ __proto__: null } instanceof Object); |
| 12 | |
| 13 | // https://ecma-international.org/ecma-262/6.0/#sec-objectcreate |
| 14 | |
| 15 | module.exports = function ObjectCreate(proto, internalSlotsList) { |
| 16 | if (proto !== null && Type(proto) !== 'Object') { |
| 17 | throw new $TypeError('Assertion failed: `proto` must be null or an object'); |
| 18 | } |
| 19 | var slots = arguments.length < 2 ? [] : internalSlotsList; |
| 20 | if (slots.length > 0) { |
| 21 | throw new $SyntaxError('es-abstract does not yet support internal slots'); |
| 22 | } |
| 23 | |
| 24 | if ($ObjectCreate) { |
| 25 | return $ObjectCreate(proto); |
| 26 | } |
| 27 | if (hasProto) { |
| 28 | return { __proto__: proto }; |
| 29 | } |
| 30 | |
| 31 | if (proto === null) { |
| 32 | throw new $SyntaxError('native Object.create support is required to create null objects'); |
| 33 | } |
| 34 | var T = function T() {}; |
| 35 | T.prototype = proto; |
| 36 | return new T(); |
| 37 | }; |