Starter Kit Gruntfile.js

gistfile1.txt

module.exports = function(grunt) {

    // Configuration 
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),

        concat: {
            dist: {
				src: [
					'source/js/libs/*.js', // All JS in the libs folder
					'source/js/init.js'  // This specific file
				],
				dest: 'public/js/production.js'
			}
        },
        uglify: {
		build: {
			src: 'public/js/production.js',
			dest: 'public/js/production.min.js'
		}
	},
	sass: {
		dist: {
			options: {
				style: 'compressed'
			},
			files: {
				'public/css/style.css': 'source/css/style.scss',
				'public/styleguide/css/styleguide.css': 'public/styleguide/css/styleguide.scss',
				'public/styleguide/css/styleguide-specific.css': 'public/styleguide/css/styleguide-specific.scss'
			}
		}
	},
	autoprefixer: {
		single_file: {
			src: 'public/css/style.css',
			dest: 'public/css/style.css'
		}
        },
	shell: {
            patternlab: {
                command: "php core/builder.php -gp"
            }
        },
	watch: {
		html: {
			files: ['source/_patterns/**/*.mustache', 'source/_patterns/**/*.json', 'source/_data/*.json'],
			tasks: ['shell:patternlab'],
			options: {
				livereload: true,
				spawn: false
			}
		},
		scripts: {
			files: ['source/js/*.js'],
			tasks: ['concat', 'uglify'],
			options: {
				livereload: true,
				spawn: false
			}
		},
		css: {
			files: ['source/css/*.scss', 'source/css/**/*.scss', 'public/styleguide/css/**/*.scss'],
			tasks: ['sass','autoprefixer'],
			options: {
				livereload: true,
				spawn: false
			}
		}
	}
    });

	// Plugins
	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-sass');
	grunt.loadNpmTasks('grunt-autoprefixer');
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-shell');

	// Tasks
	grunt.registerTask('default', ['concat', 'uglify', 'sass', 'watch', 'autoprefixer', 'shell:patternlab']);
};

With watch, as with most grunt plugins, you can move options to the top level instead of repeating them in each task.

watch: {
    options: {
        livereload: true,
        spawn: false
    },
    html: {
        files: [],
        tasks: []
    },
    scripts: {
        files: [],
        tasks: []
    },
    css: {
        files: [],
        tasks: []
    }
}

You can still override them within each task if necessary.