Aurelia/.NetCore 404 error on app.bundle.js

If you open your \wwwroot\dist folder and make a change to a file and save, you should see (I do) the newly generated vendor~{hash}.chunk.js files appear.

Also you could use BrowserLink:

I am working on it when I get the time. I update every few days. There is still quite a lot to do and can not say when it could be called production ready. I use it along side the CLI now, but that is just me.