[SSR] Fake instances tree for smart prefetching about core

[yyx990803]

I'm not sure if fake rendering is really a good idea. Mocking sounds super fragile and I doubt it can be really that lightweight if we want to make sure things don't just break.

Maybe we can tackle this from a different perspective - is it possible to statically analyze and extract queries at build time (kinda like Relay Modern)?

[Akryum]

Well, that's the approach taken by the official react-apollo (source). BTW it seems so much easier to do in React 😭

[yyx990803]

It looks quite fragile/hacky to me, and is essentially rendering the whole app twice... which means it decreases performance significantly... not sure if it's worth it at all.

That said it's totally possible in v3.

[yyx990803]

Also, it seems it cannot have nested components with queries. The walker stops when any component has async data. Still quite a limitation IMO.

[Akryum]

Maybe we could make renderToString asynchronous with ways to hook into it and do data prefetching and eventual secondary re-rerenders of components that prefetched some data?

[Akryum]

BTW react-apollo switched to rendering the app multiple times: apollographql/react-apollo#2533

[Akryum]

Closing in favor of #11