[Umbrella] Run SSR in Develop ☔

[blainekasten]

Summary

Gatsby currently does not run SSR in develop mode. This has caused some users headaches when they deploy gatsby apps to find that there are production-only issues due to SSR.

The solution is to convert gatsby develop into running true SSR.

Motivation

To make Gatsby easier to use, prevent hard to debug errors, and have a more consistent developer experience.

[teclone]

@blainekasten , I am ready to start looking into this from tomorrow. I will need to sync with you to get all the necessary understanding of what needs to be done, are you ready and willing to discuss this with me?

[blainekasten]

@teclone Yes! Send me an email at blaine@gatsbyjs.com and we'll set up a time to hop on a video call to discuss!

[teclone]

@teclone Yes! Send me an email at blaine@gatsbyjs.com and we'll set up a time to hop on a video call to discuss!

ok, done, thanks

[eyalroth]

Related: #10706

[vladar]

What would be the outcome of this umbrella issue? We have a PR: #24872 that does something similar (runs renderToString in develop).

But it fixes only a subclass of hydration issues (won't handle things like typeof windows checks, etc.

[blainekasten]

@teclone thanks for reaching out! This feature is actually now a priority of the core team for the next few sprints so we'll be able to complete it!

[blainekasten]

@vladar I believe it is to create a proper SSR implementation and not the partial solution

[teclone]

@teclone thanks for reaching out! This feature is actually now a priority of the core team for the next few sprints so we'll be able to complete it!

@blainekasten , Thanks a lot, I am following up with the progress. Kudos to you all

[lucashfreitas]

This would be neat! I am constantly running into small issues due SSR and have to run gatsby build/serve every time. Would be really useful to use that feature.

Would love to help as well 👍

[jakezien]

+1 on this — my styled components break in production but look fine on dev.

[KyleAMathews]

Hey everyone! We've shipped an initial version of SSR in develop in 2.27.0 — upgrade & try it out!

GATSBY_EXPERIMENTAL_FAST_DEV=true gatsby develop

Read more about it + some other initiatives we're working on to speedup/improve the dev server https://github.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.27/index.md

[KyleAMathews]

Also if you find bugs or oddities w/ dev ssr (or if you just want to comment on how awesome it is ;-)) — let us know over at #28138

[LekoArts]

I'll close this in favor of the same discussions, no point in having two duplicate things open: #28138

Please head on over there and give it a try!