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node_modules/es-abstract/2018/ObjectCreate.js
| 37 lines
| 1.0 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $ObjectCreate = GetIntrinsic('%Object.create%', true); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var $SyntaxError = GetIntrinsic('%SyntaxError%'); | ||||
| var Type = require('./Type'); | ||||
| var hasProto = !({ __proto__: null } instanceof Object); | ||||
| // https://www.ecma-international.org/ecma-262/6.0/#sec-objectcreate | ||||
| module.exports = function ObjectCreate(proto, internalSlotsList) { | ||||
| if (proto !== null && Type(proto) !== 'Object') { | ||||
| throw new $TypeError('Assertion failed: `proto` must be null or an object'); | ||||
| } | ||||
| var slots = arguments.length < 2 ? [] : internalSlotsList; | ||||
| if (slots.length > 0) { | ||||
| throw new $SyntaxError('es-abstract does not yet support internal slots'); | ||||
| } | ||||
| if ($ObjectCreate) { | ||||
| return $ObjectCreate(proto); | ||||
| } | ||||
| if (hasProto) { | ||||
| return { __proto__: proto }; | ||||
| } | ||||
| if (proto === null) { | ||||
| throw new $SyntaxError('native Object.create support is required to create null objects'); | ||||
| } | ||||
| var T = function T() {}; | ||||
| T.prototype = proto; | ||||
| return new T(); | ||||
| }; | ||||