WIP: Don't serve on non html main assets

[nicolaisueper]

This PR will fix #1005.

I currently do a strict check, whether the main entry asset has the .html file extension or not.
I don't know if anyone still does this today, but this would fail on .htm or .html5 main files.
This could be solved using a RegExp, like e.g. /htm|html|html5/.

But is it intended to support .hbs or other template language files as main assets?

I'd be happy if anyone has a suggestion / tip for this problem.

Regards
Nico

[DeMoorJasper]

What about checking for asset type and only serving if asset type is html?

[nicolaisueper]

Is there already a way to do this? I found nothing similiar.

[DeMoorJasper]

There is not and i'm not really sure how you'd do it, but this approach would break any non-html file as entrypoint that gets converted into html like pug for example.
Assets don't really exist until bundling starts.

[matthewmueller]

Personally, I'd like to see an HTML page generated and served for non-HTML assets rather than failing to serve. Something like the way that https://github.com/jantimon/html-webpack-plugin works.