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node_modules/core-js/internals/get-iterator-method.js

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+'use strict';
+var classof = require('../internals/classof');
+var getMethod = require('../internals/get-method');
+var isNullOrUndefined = require('../internals/is-null-or-undefined');
+var Iterators = require('../internals/iterators');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+
+var ITERATOR = wellKnownSymbol('iterator');
+
+module.exports = function (it) {
+  if (!isNullOrUndefined(it)) return getMethod(it, ITERATOR)
+    || getMethod(it, '@@iterator')
+    || Iterators[classof(it)];
+};