Setup modern JS to run with nodec

Development
  - $ npm init -y
  - $ npm install nodemon --save-dev
  - $ npm install @babel/core @babel/cli @babel/node @babel/preset-env --save-dev
  - `.babelrc` -> `{"presets": ["@babel/preset-env"]}`
  - `package.json` -> `"scripts": {"build":"babel src -d dist"}`
  - `package.json` -> `"scripts": {"start":"nodemon --exec babel-node src/file.js"}`
  or following line is the same. But note that following line is NOT restart the the output based on code changes.
  - `package.json` -> `"start": "npm run build && nodemon dist/todo_store.js"`
  - $ npm start
  
Production for node (This will not bundle dependecies in one file, you will get `require not defined` error if run it on browser.)
  - $ npm run build
  - $ node dist/file.js
  
Production for browser
  - $ browserify dist/compiled.js -o bundle.js
  - insert into HTML `<script src="bundle.js"></script>`
  
  
For `Mobx` add this to `.babelrc`:
```
{
  "presets": ["@babel/preset-env"],
  "plugins": [
    ["@babel/plugin-proposal-decorators", { "legacy": true }],
    ["@babel/plugin-proposal-class-properties", { "loose": true }]
  ]
}
```



---
Webpack
  - npm install webpack --save-dev
  - npm install webpack-cli --save-dev