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node_modules/es-abstract/2016/SpeciesConstructor.js
| 32 lines
| 846 B
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $species = GetIntrinsic('%Symbol.species%', true); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var IsConstructor = require('./IsConstructor'); | ||||
| var Type = require('./Type'); | ||||
| // https://ecma-international.org/ecma-262/6.0/#sec-speciesconstructor | ||||
| module.exports = function SpeciesConstructor(O, defaultConstructor) { | ||||
| if (Type(O) !== 'Object') { | ||||
| throw new $TypeError('Assertion failed: Type(O) is not Object'); | ||||
| } | ||||
| var C = O.constructor; | ||||
| if (typeof C === 'undefined') { | ||||
| return defaultConstructor; | ||||
| } | ||||
| if (Type(C) !== 'Object') { | ||||
| throw new $TypeError('O.constructor is not an Object'); | ||||
| } | ||||
| var S = $species ? C[$species] : void 0; | ||||
| if (S == null) { | ||||
| return defaultConstructor; | ||||
| } | ||||
| if (IsConstructor(S)) { | ||||
| return S; | ||||
| } | ||||
| throw new $TypeError('no constructor found'); | ||||
| }; | ||||