Error when mix JS files in production

• Laravel Mix Version: 0.12.0
• Node Version: 7.10.0
• NPM Version: 4.2.0
• OS: Windows 10

Description:

I use Laravel Mix to mix CSS et JS files.

I use the command: npm run production

I have undefined in combined.js file.

But, the command npm run dev works.

I have this to mix:

mix.scripts([
    'public/backend/assets/js/jquery.min.js',
    'public/backend/assets/js/bootstrap.min.js',
    'public/backend/assets/js/detect.js',
    'public/backend/assets/js/fastclick.js',
    'public/backend/assets/js/jquery.slimscroll.js',
    'public/backend/assets/js/jquery.blockUI.js',
    'public/backend/assets/js/waves.js',
    'public/backend/assets/js/wow.min.js',
    'public/backend/assets/js/jquery.nicescroll.js',
    'public/backend/assets/js/jquery.scrollTo.min.js',
    'public/backend/plugins/switchery/switchery.min.js',
    'public/backend/plugins/bootstrap-sweetalert/sweet-alert.min.js',
    'public/backend/plugins/bootstrap-tagsinput/dist/bootstrap-tagsinput.min.js',
    'public/backend/plugins/waypoints/lib/jquery.waypoints.js',
    'public/backend/plugins/counterup/jquery.counterup.min.js',
    'public/backend/plugins/jquery-circliful/js/jquery.circliful.min.js',
    'public/backend/plugins/jquery-sparkline/jquery.sparkline.min.js',
    'public/backend/plugins/skyicons/skycons.min.js',
    'public/backend/assets/pages/jquery.dashboard.js',
    'public/backend/plugins/morris/morris.min.js',
    'public/backend/plugins/raphael/raphael-min.js',
    'public/backend/plugins/summernote/dist/summernote.min.js',
    'public/backend/assets/js/jquery.core.js',
    'public/backend/assets/js/jquery.app.js',
], 'public/backend/javascripts/combined.js');

Steps To Reproduce:

To reproduce error, you must type this command: npm run production

[laracasts]

Fixed in v0.12.1.

[tdondich]

This is related to https://github.com/JeffreyWay/laravel-mix/issues/828 . Note that specifying mix version 0.11.4 in your package.json resolves it until a fix is committed.