Laravel 6.0.3 Not Loading Key Resources App.js or App.css 404 Not Found
My setup was a little wrong, I mostly forgetting to run npm install and npm run dev command that is required to compile the app.js and app.css files.
Correct setup command sequence was:
laravel new cmscd cmsphp artisan migratecomposer require laravel/uinpm installphp artisan ui vue --authnpm install && npm run dev
The app.css and app.js were missing from a new app. The proper steps had been run as are noted in Jack Robson's answer above. I reran the last two steps:
php artisan ui vue --auth npm install && npm run dev
And it generated the app.css and app.js - all good now.
No idea what had gone wrong in the initial install.