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