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32 lines
843 B
32 lines
843 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 = require('es-errors/type'); |
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var isObject = require('es-object-atoms/isObject'); |
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var IsConstructor = require('./IsConstructor'); |
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// https://262.ecma-international.org/6.0/#sec-speciesconstructor |
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module.exports = function SpeciesConstructor(O, defaultConstructor) { |
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if (!isObject(O)) { |
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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 (!isObject(C)) { |
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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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