Improve code quality and write tests

node_modules/@babel/preset-env/lib/get-option-specific-excludes.js

@@ -0,0 +1,13 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = _default;
+const defaultExcludesForLooseMode = ["transform-typeof-symbol"];
+
+function _default({
+  loose
+}) {
+  return loose ? defaultExcludesForLooseMode : null;
+}