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node_modules/core-js/internals/advance-string-index.js

@@ -0,0 +1,8 @@
+'use strict';
+var charAt = require('../internals/string-multibyte').charAt;
+
+// `AdvanceStringIndex` abstract operation
+// https://tc39.es/ecma262/#sec-advancestringindex
+module.exports = function (S, index, unicode) {
+  return index + (unicode ? charAt(S, index).length || 1 : 1);
+};