Gruntfile.js

module.exports = function (grunt) {

	// MAIN
	grunt.initConfig({
		uglify: {
			build: {
				src: 'assets/js/app.js',
				dest: 'build/js/app.min.js'
		  	}
		},
		concat: {
			css: {
				src: ['assets/css/reset.css', 'assets/sass/_mixins.scss', 'assets/sass/_vars.scss', 'assets/sass/_custom-reset.scss', 'assets/sass/_custom-mixins.scss', 'assets/sass/dc.scss'],
				dest: 'assets/concat/app.scss'
			}
		},
		sass: {
			build: {
				options: {
					style: 'compressed'
				},
				files: {
					'build/css/app.min.css': 'assets/concat/app.scss'
				}
			}
		},
		watch: {
			js: {
				files: 'assets/js/*.js',
				tasks: ['uglify']
			},
			css: {
				files: ['assets/sass/*.scss'],
				tasks: ['concat:css', 'sass']
			}
		}
	});

	// LOAD
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-contrib-sass');
	grunt.loadNpmTasks('grunt-contrib-concat');

	// GO
	grunt.registerTask('default', ['uglify', 'concat', 'sass', 'watch']);

};