The 'watch' task in Gruntfile.js (as scaffolded by yo webapp)

gistfile1.js

grunt.initConfig({
    yeoman: yeomanConfig,
    watch: {
        coffee: {
            files: ['<%= yeoman.app %>/scripts/{,*/}*.coffee'],
            tasks: ['coffee:dist']
        },
        coffeeTest: {
            files: ['test/spec/{,*/}*.coffee'],
            tasks: ['coffee:test']
        },
        compass: {
            files: ['<%= yeoman.app %>/styles/{,*/}*.{scss,sass}'],
            tasks: ['compass:server']
        },
        livereload: {
            files: [
                '<%= yeoman.app %>/*.html',
                '{.tmp,<%= yeoman.app %>}/styles/{,*/}*.css',
                '{.tmp,<%= yeoman.app %>}/scripts/{,*/}*.js',
                '<%= yeoman.app %>/images/{,*/}*.{png,jpg,jpeg,gif,webp,svg}'
            ],
            tasks: ['livereload']
        }
    },

grunt.initConfig({
    yeoman: yeomanConfig,
    watch: {
        options: {
            nospawn: true
        },
        coffee: {
            files: ['<%= yeoman.app %>/scripts/{,*/}*.coffee'],
            tasks: ['coffee:dist']
        },
        coffeeTest: {
            files: ['test/spec/{,*/}*.coffee'],
            tasks: ['coffee:test']
        },
        compass: {
            files: ['<%= yeoman.app %>/styles/{,*/}*.{scss,sass}'],
            tasks: ['compass:server', 'autoprefixer' ]
        },
        styles: {
            files: ['<%= yeoman.app %>/styles/{,*/}*.css'],
            tasks: ['copy:styles', 'autoprefixer']
        },
        livereload: {
            options: {
                livereload: LIVERELOAD_PORT
            },
            files: [
                '<%= yeoman.app %>/*.html',
                '.tmp/styles/{,*/}*.css',
                '{.tmp,<%= yeoman.app %>}/scripts/{,*/}*.js',
                '<%= yeoman.app %>/templates/{,*/}*.hbs',
                '<%= yeoman.app %>/images/{,*/}*.{png,jpg,jpeg,gif,webp,svg}'
            ]
        },
        tasks: ['assemble', 'livereload']
    },