message: 'Unexpected token: punc (.)', while using uglify in grunt

Question

Goal

My goal is to concatenate all my css,js files and minify all of them. I can minify my concat.js, but I'm struggling trying to minify my concat.css.

---

Gruntfile.js

module.exports = function(grunt) {
    "use strict";

    grunt.initConfig({

        concat: {

            js: {
                src: [

                    'js/bootstrap.min.js',
                    'js/jquery-1.10.2.min.js',

                    'js/jquery.easypiechart.min.js',
                    'js/jquery.isotope.min.js',
                    'js/jquery.magnific-popup.min.js',
                    'js/waypoints.min.js',
                    'js/respond.min.js',
                    'js/jquery.vegas.min.js',
                    'js/modernizr-2.6.2.min.js',
                    'js/jquery.nav.js',
                    'js/html5shiv.js',
                    'js/jquery.scrollTo.js',
                    'js/jquery.sticky.js',
                    'js/jquery.validate.js',
                    'js/main.js',

                ],
                dest: 'dist/concat.js'
            },

            css: {
                src: [


                    'css/magnific-popup.css',
                    'css/main.css',
                    'css/xl.css',
                    'css/lg.css',
                    'css/md.css',
                    'css/sm.css',
                    'css/xs.css',
                    'css/print.css',
                    'css/bootstrap.min.css',
                    'css/font-awesome.min.css',

                ],
                dest: 'dist/concat.css'
            }
        },

        watch: {

            js: {

                files: ['js/*.js'],
                task: ['concat:js']
            },

            css: {
                files: ['css/*.css'],
                task: ['concat:css']
            }
        },

        uglify: {

            js: {
                files: {
                    'dist/minified.js': ['dist/concat.js']
                }
            },

            css: {
                files: {
                    'dist/minified.css': ['dist/concat.css']
                }
            }
        }

    });

    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.registerTask('default', ['concat', 'uglify']);

};

---

Result

I concatenate all my css and js files succesfully, and they're generated at :

• dist/concat.js
• dist/concat.css

Then, I can also minify my concat.js with no problem, but I'm struggling trying to minify my concat.css.

I kept getting this error in the bottom of my Terminal :

Running "uglify:css" (uglify) task
{ message: 'Unexpected token: punc (.)',
  filename: 'concat.css',
  line: 4,

and line4 is just the beginning of my class : .mfp-bg {

Can someone please give me a little push here ? Also, should I perform minify after concatenation or the other way around ? Is there a better way to do this ?

Answer 1

uglify is for minimising JavaScript only, not CSS.

If you want to minimise CSS you can use the cssmin task for Grunt instead.