Generate separate `app.html` and `index.html`/etc for better hydration behavior

[kestred]

Is your feature request related to a problem? Please describe.
Better support for non-prerendered pages (avoids whiteflash; some server config gotchas, etc)

Describe the solution you'd like
Either by default (or with an option) to render a separate app.html and index.html.

For previous work on the problem, see:

• 'Flash' on rendered page when Vue takes over chrisvfritz/prerender-spa-plugin#193
• https://stackoverflow.com/questions/51154224/vue-pre-render-spa-root-overwrites-template-file/51218261

Describe alternatives you've considered
Trying to get a vue-cli project to have 2 separate build scripts (one for pre-rendered and one for not)

[SolarLiner]

I don't really understand what you're asking for here. Are you asking for a way to skip pre-rendering? Or when building, to both output the non-pre-rendered and the prerendered HTML?

[kestred]

At basic level... the latter!

Basically to have the non-pre-rendered file be output as app.html; while the pages are output as normal. The stack overflow response shows an example of configuring Vue CLI to use prerender (sans this plugin) to accomplish the effect.

[SolarLiner]

I've actually implemented this without options - it's enabled by default.

Thanks for the feature request!