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node_modules/core-js/internals/species-constructor.js

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+'use strict';
+var anObject = require('../internals/an-object');
+var aConstructor = require('../internals/a-constructor');
+var isNullOrUndefined = require('../internals/is-null-or-undefined');
+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 || isNullOrUndefined(S = anObject(C)[SPECIES]) ? defaultConstructor : aConstructor(S);
+};