Improve code quality and write tests

node_modules/regexp-tree/dist/interpreter/finite-automaton/transforms/index.js

@@ -0,0 +1,10 @@
+/**
+ * The MIT License (MIT)
+ * Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
+ */
+
+'use strict';
+
+module.exports = [
+// a+ -> aa*
+require('./char-plus-to-star-transform')];