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node_modules/core-js/modules/es.string.iterator.js

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+'use strict';
+var charAt = require('../internals/string-multibyte').charAt;
+var toString = require('../internals/to-string');
+var InternalStateModule = require('../internals/internal-state');
+var defineIterator = require('../internals/iterator-define');
+var createIterResultObject = require('../internals/create-iter-result-object');
+
+var STRING_ITERATOR = 'String Iterator';
+var setInternalState = InternalStateModule.set;
+var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);
+
+// `String.prototype[@@iterator]` method
+// https://tc39.es/ecma262/#sec-string.prototype-@@iterator
+defineIterator(String, 'String', function (iterated) {
+  setInternalState(this, {
+    type: STRING_ITERATOR,
+    string: toString(iterated),
+    index: 0
+  });
+// `%StringIteratorPrototype%.next` method
+// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next
+}, function next() {
+  var state = getInternalState(this);
+  var string = state.string;
+  var index = state.index;
+  var point;
+  if (index >= string.length) return createIterResultObject(undefined, true);
+  point = charAt(string, index);
+  state.index += point.length;
+  return createIterResultObject(point, false);
+});