33 lines
839 B
Plaintext
33 lines
839 B
Plaintext
'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://262.ecma-international.org/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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