v2

.babelrc

+{
+  "presets": ["@babel/preset-env"],
+  "plugins": ["@babel/plugin-proposal-optional-chaining"]
+}
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.gitignore

+node_modules
+dist
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index.js

-module.exports = (str) => {
-    return `=======>${str}<=======`;
+module.exports = require('./dist');
\ No newline at end of file
-}
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package.json

@@ -4,7 +4,16 @@
   "description": "",
   "description": "",
   "main": "index.js",
   "main": "index.js",
   "scripts": {
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "babel src -D -d dist/src && babel ./.babelrc -D -d dist && babel ./package.json -D -d dist && echo '\n🍺  'Build success at `date '+%T %F'`"
+
+  },
+  "devDependencies": {
+    "@babel/cli": "7.0.0-rc.1",
+    "@babel/core": "7.0.0-rc.1",
+    "@babel/node": "7.0.0-rc.1",
+    "@babel/plugin-proposal-optional-chaining": "7.9.0",
+    "@babel/preset-env": "7.0.0-rc.1"
   },
   },
   "repository": {
   "repository": {
     "type": "git",
     "type": "git",

src/index.js

+class Utils {
+    /**
+     * @description Testasdfasdfasdf
+     * @param {String} str 
+     * @returns {String}
+     */
+    static printf(str){
+        return `=======>${str}<=======`;
+    }
+}
+
+export default Utils;
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