It's easy! There are only 2 steps:

1. Install required packages with NPM: `npm install browserify babelify`
2. Create *package.json* with the following content (for example, here *main.js* file is source file and *bundle.js* is output file. Also note we are applying transformer to browserify command):

    ```json
    {
      "scripts": {
        "build-js": "browserify -t babelify main.js > bundle.js"
      }
    }
    ```

Thats it! Now whenever you feel to build up your ES6 code (*main.js*), just fire `npm run build`. If you are wondering why building via NPM: it allows you to call commands that are installed on project level (so you don't have to pollute global *node_modules*).

Have fun writing JavaScript of tomorrow!