Precompile scss to css

Gruntfile.js

var root = "./assets";
var publicPath = "./public/assets";
var cssPath = publicPath + "/css/";
var jsPath = publicPath + "/js/";
var htmlDevelopmentFiles = ['./app/views/**/*.html'];

var sass = {
	source: root + '/css/',
	dest: cssPath,
	pattern: "**/*.scss"
};

var livereload = {
	host: 'localhost',
	port: 10766
};

module.exports = function (grunt) {

	require('load-grunt-tasks')(grunt);
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		sass: {
			dist: {
				options: {
					sourceMap: true,
					style: "compressed"
				},
				files: [{
					expand: true,
					flatten: true,
					cwd: sass.source,
					src: ["!**/*.ignore.scss", sass.pattern],
					dest: sass.dest,
					ext: '.min.css'
				}],
			}
		},
		watch: {
			sass: {
				files: [sass.source + sass.pattern, "!**/*.ignore.scss"],
				tasks: ['pre-compile'],
				options: {
					spawn: true
				},
			},
			livereload: {
				files: [sass.source + sass.pattern, htmlDevelopmentFiles],
				options: {
					livereload: livereload,
					spawn: true
				}
			}
		}
	});

	grunt.registerTask('default', ['watch']);
	grunt.registerTask('production', ['pre-compile']);
	grunt.registerTask('pre-compile', ['sass']);;
	grunt.loadNpmTasks('grunt-contrib-sass');
	grunt.loadNpmTasks('grunt-contrib-watch');
};