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node_modules/core-js/internals/iterate-simple.js

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+'use strict';
+var call = require('../internals/function-call');
+
+module.exports = function (record, fn, ITERATOR_INSTEAD_OF_RECORD) {
+  var iterator = ITERATOR_INSTEAD_OF_RECORD ? record : record.iterator;
+  var next = record.next;
+  var step, result;
+  while (!(step = call(next, iterator)).done) {
+    result = fn(step.value);
+    if (result !== undefined) return result;
+  }
+};