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

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+'use strict';
+var getBuiltIn = require('../internals/get-built-in');
+var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+var DESCRIPTORS = require('../internals/descriptors');
+
+var SPECIES = wellKnownSymbol('species');
+
+module.exports = function (CONSTRUCTOR_NAME) {
+  var Constructor = getBuiltIn(CONSTRUCTOR_NAME);
+
+  if (DESCRIPTORS && Constructor && !Constructor[SPECIES]) {
+    defineBuiltInAccessor(Constructor, SPECIES, {
+      configurable: true,
+      get: function () { return this; }
+    });
+  }
+};