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13 lines
518 B
13 lines
518 B
var anObject = require('../internals/an-object'); |
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var aConstructor = require('../internals/a-constructor'); |
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var wellKnownSymbol = require('../internals/well-known-symbol'); |
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var SPECIES = wellKnownSymbol('species'); |
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// `SpeciesConstructor` abstract operation |
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// https://tc39.es/ecma262/#sec-speciesconstructor |
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module.exports = function (O, defaultConstructor) { |
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var C = anObject(O).constructor; |
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var S; |
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return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aConstructor(S); |
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};
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