Example of a grunt file

Gruntfile.js

module.exports = function(grunt) {
	//1. Configurations
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		
		coffee: {
			dist: {
				files: {
					'src/js/global.js': 'src/coffee/global.coffee'
				}
			}
		},	
		/* Need to have ruby and haml installed */ 
		haml: {
			dist: {
			  files: {
				'tmosest.php': 'src/haml/tmosest.haml'
			   }
			}
		 },
		 /* Need to have ruby and sass installed */ 
		 sass: {
		 	dist: {
				files: {
					'src/css/stylesheet.css': 'src/sass/main.sass'	
				}
			}
		 },
		 less: {
		 	dist: {
				files: {
					'src/css/stylesheet.css': 'src/less/stylesheet.less'
				}
			}
		 },
		 concat: {
			libs: {
				src: 'src/js/libs/*.js',
				dest: 'src/js/_libs.js'
			},
      app: {
				src: 'src/js/app/**/*.js',
				dest: 'src/js/app.js'
			},
      appLess: {
				src: 'src/js/app/**/*.less',
				dest: 'src/less/app.less'
			},
			js: {
				src: 'src/js/*.js',
				dest: 'js/main.js'
			},
			css: {
				src: 'src/css/*.css',
				dest: 'css/main.css'
			}
		  },
		  uglify: {
		  	build: {
				src: "js/main.js",
				dest: "js/main.min.js"
			}
		  },
		  cssmin: {
		  	css: {
				src: "css/main.css",
				dest: "css/main.min.css"
			}
		  },
		  watch: {
		  	haml: {
				files: ["src/haml/*.haml"],
				tasks: ["haml"]
			},
			css: {
				files: ["src/css/*.css"],
				tasks: ["concat:css", "cssmin"]
			},
			less: {
				files: ["src/less/**/*.less"],
				tasks: ["less"]
			},
			sass: {
				files: ["src/sass/*.sass"],
				tasks: ["sass"]
			},
			js: {
				files: ["src/js/**/*.js"],
				tasks: ["concat:libs", "concat:js", "uglify"]
			},
			coffee: {
				files: ["src/coffee/*.coffee"],
				tasks: ["coffee"]
			}
		  }
	});
	
	//3. Load packages
	grunt.loadNpmTasks('grunt-contrib-coffee');
	
	grunt.loadNpmTasks('grunt-contrib-concat');
	
	grunt.loadNpmTasks('grunt-contrib-haml');
	
	grunt.loadNpmTasks('grunt-contrib-less');
	
	grunt.loadNpmTasks('grunt-contrib-sass');
	
	grunt.loadNpmTasks('grunt-contrib-uglify');
	
	grunt.loadNpmTasks('grunt-contrib-watch');
	
	grunt.loadNpmTasks('grunt-css');
	
	//4. Add it to default grunt task
	grunt.registerTask('default', ['concat:appLess', 'less', 'concat', 'uglify', 'cssmin']);
	
	grunt.registerTask('watchham', ['watch:haml']);
};