文件操作 - species-constructor.js
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文件: /node_modules/core-js/internals/species-constructor.js
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var anObject = require('../internals/an-object'); var aFunction = require('../internals/a-function'); var wellKnownSymbol = require('../internals/well-known-symbol'); var SPECIES = wellKnownSymbol('species'); // `SpeciesConstructor` abstract operation // https://tc39.github.io/ecma262/#sec-speciesconstructor module.exports = function (O, defaultConstructor) { var C = anObject(O).constructor; var S; return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S); };
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