Grunt outputs an empty .js-file after concatting

Question

The output of the Gruntfile is an empty file in public/assets/app.js. The Sass-part works fine, but the JS-part doesn't.

//Gruntfile 
module.exports = function(grunt) {

  //Initializing the configuration object
    grunt.initConfig({

    // Task configuration
    sass: {
        dist: {
             options: {
              style: 'compressed'
            },
            files: {
              './public/assets/app.css': './app/assets/scss/style.scss'
            },
            noCache: true
        }
    },
    concat: {
      options: {
        separator: ';',
      },
      dist: {
        src: [
          './app/bower/jquery/jquery.js',
          './app/assets/js/script.js'
        ],
        dest: './public/assets/app.js',
      },
    },
    uglify: {
      options: {
        mangle: false 
      },
      dist: {
        files: {
          './public/assets/app.js': './public/assets/app.js',
        }
      },
    },
    jshint: {
      all: ['Gruntfile.js', './public/assets/app.js']
    },
    watch: {
        js: {
          files: [
            './app/assets/bower/*.js',
            './app/assets/js/*.js'
            ],   
          tasks: ['jshint', 'concat', 'uglify'],  
          options: {
            livereload: false 
          }
        },
        sass: {
          files: ['./app/assets/scss/*.scss'],
          tasks: ['sass'], 
          options: {
            livereload: false  
          }
        }
      }
    });

  // Plugin loading
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-contrib-sass');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-jshint');

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

};

But I can't find out what is wrong. Even JShint isn't showing errors. Structure looks like this: https://www.dropbox.com/s/y0t2tu0asotz0ex/Screenshot%202013-12-20%2020.49.54.png

Answer 1

Taking another look at your Gruntfile and directory structure, I think you have the folders specified incorrectly, You specify the source as being ./app/..., but if your Gruntfile is in that directory (app), then you would have to be running your grunt tasks from there, meaning it would be looking for app/app/... (because it's relative to the current directory). Try this:

concat: {
  options: {
    separator: ';',
  },
  dist: {
    src: [
      'bower/jquery/jquery.js',
      'assets/js/script.js'
    ],
    dest: 'public/assets/app.js',
  },
},

Answer 2

My solution is set correct filepath: Scripts/libs/Timer.js - correct, /Scripts/libs/Timer.js - empty file Scripts is a folder into my project. Project/Scripts/libs/Timer.js - full path. when I set this path: Scripts/libs/Timer.js - file isn't empty, when /Scripts/libs/Timer.js - file is empty.

concat: {
            options:{
                // define a string to put between each file in the concatenated output
                separator: '\n;'
            },
            own_scripts: {
                //project-files
                src: [
                    "Scripts/application/app.js",
                    "Scripts/application/Controllers/*.js",
                    "Scripts/application/Directives/*.js",
                    "Scripts/application/Filters/*.js",
                    "Scripts/application/Services/*.js"
                ],
                dest: 'dist/scripts-concat.js'
}

maybe you should do this:

    dist: {
        src: [
          'app/bower/jquery/jquery.js',
          'app/assets/js/script.js'
        ],
        dest: 'public/assets/app.js',
      },