Cant version specific file in Mix

I am trying to version a specific file.

mix.js('resources/assets/js/app.js', 'public/js') .sass('resources/assets/sass/app.scss', 'public/css') .babel([ 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js', 'resources/assets/js/libs/xxxx.js' ], 'public/js/libs.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .scripts('resources/assets/js/pages/xxxx.js', 'public/js/xxxx.js') .version([ 'public/js/app.js' ]);

I am trying to version app.js but I get the error: Error: ENOENT: no such file or directory, open 'public/js/app.js'

I have also tried: app.*.js