Improve code quality and write tests

node_modules/@babel/plugin-transform-arrow-functions/lib/index.js

@@ -0,0 +1,38 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+function _helperPluginUtils() {
+  const data = require("@babel/helper-plugin-utils");
+
+  _helperPluginUtils = function () {
+    return data;
+  };
+
+  return data;
+}
+
+var _default = (0, _helperPluginUtils().declare)((api, options) => {
+  api.assertVersion(7);
+  const {
+    spec
+  } = options;
+  return {
+    name: "transform-arrow-functions",
+    visitor: {
+      ArrowFunctionExpression(path) {
+        if (!path.isArrowFunctionExpression()) return;
+        path.arrowFunctionToExpression({
+          allowInsertArrow: false,
+          specCompliant: !!spec
+        });
+      }
+
+    }
+  };
+});
+
+exports.default = _default;