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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.es/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);
};