How to get output from usemin task?

Question

I'm currently using the usemin task to do my concat and uglify tasks. However, I'm not getting any output from the concat/uglify tasks. Not seeing any errors or warnings. How can I get the resulting output dist/app/myscript.js script?

Gruntfile.js is as follows:

module.exports = function(grunt){
  var paths = {
    app: 'app',
    dist: 'dist'
  };

  grunt.initConfig({
    paths: paths,
    clean: {
      dist: {
        src: ['<%= paths.dist %>']
      }
    },
    copy: {
        dist: {
            files: [
                {expand: true, cwd: '.', src: ['**'], dest: '<%= paths.dist %>/'}
            ]
        }
    },
    useminPrepare: {
      html: '<%= paths.dist %>/<%= paths.app %>/index.html'
    },
    usemin: {
        html: '<%= paths.dist %>/<%= paths.app %>/index.html'
    }
  });

  grunt.loadNpmTasks('grunt-usemin');
  grunt.loadNpmTasks('grunt-contrib-cssmin');
  grunt.loadNpmTasks('grunt-contrib-copy');
  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.registerTask('default', ['clean','copy']);
  grunt.registerTask('use', ['useminPrepare','usemin'])
}

HTML Build snippet:

<!-- build:js myscript.js -->
<script type="text/javascript" src='router.js'></script>
<script type="text/javascript" src='bootstrap.js'></script>
<!-- endbuild -->

Console output:

Running "useminPrepare:html" (useminPrepare) task
Going through dist/app/index.html to update the config
Looking for build script HTML comment blocks

Found a block:
<!-- build:js myscript.js -->
<!-- Globals -->
<script type="text/javascript" src='router.js'></script>
<script type="text/javascript" src='bootstrap.js'></script>
<!-- endbuild -->
Updating config with the following assets:
    - dist/app/router.js
    - dist/app/bootstrap.js

Configuration is now:

  cssmin:
  {}

  concat:
  { 'dist/app/myscript.js': 
   [ 'dist/app/router.js',
     'dist/app/bootstrap.js' ] }

  uglify:
  { 'dist/app/myscript.js': 'dist/app/myscript.js' }

  requirejs:
  {}

Running "usemin:html" (usemin) task

Processing as HTML - dist/app/index.html
Update the HTML to reference our concat/min/revved script files
Update the HTML with the new css filenames
Update the HTML with the new img filenames
Update the HTML with data-main tags
Update the HTML with the data tags
Update the HTML with background imgs, case there is some inline style
Update the HTML with anchors images
Update the HTML with reference in input

Done, without errors.

Answer 1

It turns out the problem is with the registerTask(). You need to explicitly add concat/uglify. So it should look like this: grunt.registerTask('use', ['useminPrepare','usemin','concat','uglify'])