gruntfile.js

// Load Grunt
module.exports = function (grunt) {
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
	// Tasks
		
	sass: { // Begin Sass Plugin
		dist: {
			options: {
				sourcemap: 'none'
			},
			files: [{
				expand: true,
				cwd: 'sass',
				src: ['**/*.scss'],
				dest: 'css',
				ext: '.css'
		}]
		}
	},
	postcss: { // Begin Post CSS Plugin
		options: {
			map: false,
			processors: [
		require('autoprefixer')({
					browsers: ['last 2 versions']
				})
	]
		},
		dist: {
			src: 'css/style.css'
		}
	},
	cssmin: { // Begin CSS Minify Plugin
		target: {
			files: [{
				expand: true,
				cwd: 'css',
				src: ['*.css', '!*.min.css'],
				dest: 'css',
				ext: '.min.css'
	}]
		}
	},
	watch: { // Compile everything into one task with Watch Plugin
		css: {
			files: '**/*.scss',
			tasks: ['sass', 'postcss', 'cssmin']
		}
	}
	});
	// Load Grunt plugins
	grunt.loadNpmTasks('grunt-contrib-sass');
	grunt.loadNpmTasks('grunt-postcss');
	grunt.loadNpmTasks('grunt-contrib-cssmin');
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-watch');

	// Register Grunt tasks
	grunt.registerTask('default', ['watch']);
};