Configuração de Gruntfile para projetos web com todas as otimizacoes

Gruntfile.js

module.exports = function(grunt) {
        grunt.initConfig({
		clean: {
			build: ['build'],
			dist: ['dist']
		},
		less: {
			options: {
				paths: ["src/less"]
			},
			build: {
				files: {
					'build/assets/style.css': ['src/less/**/*.less']
				}
			},
			dist: {
				options: {
					yuicompress: true,
					strictImport: true,
					report: 'gzip'
				},
				files: {
					'dist/assets/style.css': ['src/less/**/*.less']
				}
			}
		},
		csslint: {
			options: {
				import: 2,
				absoluteFilePathsForFormatters: true,
				formatters: [{
					id: 'text',
					dest: 'report/csslint.txt'
				}, {
					id: 'csslint-xml',
					dest: 'report/csslint.xml'
				}]
			},
			build: {
				src: ['build/assets/*.css']
			},
			dist: {
				src: ['dist/assets/*.css']
			}
		},
		jshint: {
			all: ['{src, test}/js/**/*.js'],
			ignores: ['{src, test}/js/lib/**/*.js']
		},
		pkg: grunt.file.readJSON('package.json'),
		uglify: {
			options: {
				banner: '/*! <%= pkg.name %> - v<%= pkg.version %> - <%= grunt.template.today("yyyy-mm-dd") %> */'
			},
			build: {
				options: {
					mangle: false,
					beautify: true
				},
				files: {
					'build/assets/script.js': ['src/js/main.js', 'src/js/other.js']
				}
			},
			dist: {
				options: {
					report: 'gzip',
					beautify: false
				},
				files: {
					'dist/assets/script.js': ['src/js/main.js', 'src/js/other.js']
				}
			}
		},
		htmlmin: {
			options: {
				removeAttributeQuotes: true,
				removeRedundantAttributes: true,
				useShortDoctype: true,
				removeOptionalTags: true
			},
			build: {
				files: [{
					expand: true,
					cwd: 'src/',
					src: ['*.html', '*.htm'],
					dest: 'build/'
				}]
			},
			dist: {
				options: {
					removeComments: true,
					removeCommentsFromCDATA: true,
					collapseWhitespace: true
				},
				files: [{
					expand: true,
					cwd: 'src/',
					src: ['*.html', '*.htm'],
					dest: 'dist/'
				}]
			}
		},
		imagemin: {
			options: {
				progressive: true
			},
			build: {
				options: {
					optimizationLevel: 0
				},
				files: [{
					expand: true,
					cwd: 'src/img/',
					src: ['**/*.jpg', '**/*.png', '**/*.jpeg', '**/*.gif'],
					dest: 'build/'
				}]
			},
			dist: {
				options: {
					optimizationLevel: 3
				},
				files: [{
					expand: true,
					cwd: 'src/img/',
					src: ['**/*.jpg', '**/*.png', '**/*.jpeg', '**/*.gif'],
					dest: 'dist/'
				}]
			}
		},
		watch: {
			options:{
				nospawn: true,
				livereload: 34567 //port: 35729
			},
			buildScripts: {
				files: ['{src,test}/js/**/*.js', 'Gruntfile.js'],
				tasks: ['jshint', 'uglify:build']
			},
			buildImages: {
				files: ['src/img/**/*'],
				tasks: ['imagemin:build']
			},
			buildStyles: {
				files: ['src/less/**/*.less'],
				tasks: ['less:build', 'csslint:build']
			},
			buildPages: {
				files: ['src/**/*.html'],
				tasks: ['htmlmin:build']
			}
		}
	});

	//configura watchers
	grunt.event.on('watch', function(action, filepath) {
		grunt.config(['jshint', 'all'], filepath);
		grunt.config(['uglify:build', 'all'], filepath);
		grunt.config(['imagemin:build', 'all'], filepath);
		grunt.config(['less:build', 'all'], filepath);
		grunt.config(['csslint:build', 'all'], filepath);
		grunt.config(['htmlmin:build', 'all'], filepath);
	});


	// carrega plugins
	grunt.loadNpmTasks('grunt-contrib-clean');
	grunt.loadNpmTasks('grunt-contrib-less');
	grunt.loadNpmTasks('grunt-contrib-jshint');
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-csslint');
	grunt.loadNpmTasks('grunt-contrib-htmlmin');
	grunt.loadNpmTasks('grunt-contrib-imagemin');
	grunt.loadNpmTasks('grunt-contrib-watch');

	//registra tarefas
	grunt.registerTask('build', ['clean:build', 'less:build', 'csslint:build', 'jshint', 'uglify:build', 'htmlmin:build', 'imagemin:build']);
	grunt.registerTask('dist', ['clean:dist', 'less:dist', 'csslint:dist', 'jshint', 'uglify:dist', 'htmlmin:dist', 'imagemin:dist']);
	grunt.registerTask('default', ['build']);
};