Gruntfile for ES6 with babel and browserify

Gruntfile.coffee

path = require 'path'


module.exports = (grunt) ->

    pkg = grunt.file.readJSON('package.json')
    nodePackages = Object.keys(pkg.dependencies or {})

    grunt.initConfig
        pkg: pkg
        root: 'theme/static'
        assets: '<%= root %>/assets'
        dist: '<%= root %>/dist'
        sass:
            dist:
                options:
                    includePaths: require('node-refills').includePaths
                files:
                    '<%= dist %>/css/main.css': '<%= root %>/sass/main.scss'
        browserify:
            modules:
                options:
                    require: nodePackages
                files:
                    '<%= dist %>/js/modules.js': []
            apps:
                options:
                    transform: ['babelify']
                    exclude: nodePackages
                files: [
                    expand: true
                    src: ['**/app.js']
                    dest: '<%= dist %>/js'
                    cwd: '<%= root %>/js'
                    rename: (dest, srcPath) ->
                        # Rename from something/app.js -> something.js
                        filename = srcPath.replace /^(.*\/)?([^\/]+?)\/app.js$/, '$1$2.js'
                        console.log filename
                        path.join(dest, filename)
                ]
        uglify:
            options:
                sourceMap: true
            dist:
                files: [
                    expand: true
                    cwd: '<%= dist %>/js'
                    src: ['**/*.js']
                    dest: '<%= dist %>/js'
                    ext: '.min.js'
                    extDot: 'last'
                    # Don't re-minimize already minimized files
                    filter: (filename) ->
                        not /.min.js$/.test filename
                ]
        watch:
            options:
                atBegin: true
            sass:
                files: [
                    "<%= root %>/sass/**/*.scss"
                ]
                tasks: ['sass']
            js:
                files: [
                    "<%= root %>/js/**/*.js"
                ]
                tasks: ['browserify:apps']
        clean:
            dist: ['<%= dist %>']
    
    require('load-grunt-tasks')(grunt)

    grunt.registerTask 'js', [
        'browserify',
        'uglify',
    ]

    grunt.registerTask 'build', [
        'sass',
        'js'
    ]

    grunt.registerTask 'default', ['build']