Gruntfile.js

module.exports = function(grunt) {
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        sass: {
            dist: {
                options: {
                    sourcemap: false,
                    compress: false,
                    yuicompress: false,
                    style: 'expanded',
                },
                files: {
                    'assets/css/frontend.css' : 'scss/frontend.scss'
                }
            },
        },
        cssmin: {
            target: {
                files: [{
                    expand: true,
                    cwd: 'assets/css',
                    src: ['*.css', '!*.min.css'],
                    dest: 'assets/css',
                    ext: '.min.css'
                }]
            }
        },
        watch: {
            scssToCss: {
                files: '**/*.scss',
                tasks: ['sass','cssmin']
            },
        }
    });
    
    grunt.loadNpmTasks('grunt-contrib-cssmin');
    grunt.loadNpmTasks('grunt-contrib-sass');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.registerTask('default',['watch']);
}