How to merge a file with several other files, dynamically using Grunt?

Question

I have a problem that I cannot solve in any way. The problem is this:

I use the Grunt to automate the tasks of my projects, and in this case, I am using it as follows:

As I did in the above drawing, I would like to take all the Javascript files from the "DEV" folder and join with the "scripts.js" file to result in files with the same name and subdirectory, but located in the "JS" folder. I wanted to do all this dynamically, with directories and subdirectories.

My (test) code is this:

extras2: {
  options: {
    log: true
  },
  expand: true, // set to true to enable options following options:
  cwd: '<%= dirs.folder %>dev/js', // all sources relative to this path
  src: ['**/*.js', '!**/scripts.js', '!**/_base/**'], // source folder patterns to match, relative to cwd
  dest: '<%= dirs.folder %>js', // destination folder path prefix
  ext: '.js' // replace any existing extension with this value in dest folder
}

Remembering that the scripts file is in the "dev folder".

Answer 1

To concatenate the files, you need to include the option concat in his Gruntfile:

concat: {
    options: {
        separator: ';'
    },
    dist: {
        src: ['dev/*.js'],
        dest: 'js/tudojunto.js'
    }
},