"Invalid hook call" trying to use hooks from a JSX file

[BurlyBurr]

What version of Bun is running?

1.2.13+64ed68c9e

What platform is your computer?

Darwin 24.6.0 arm64 arm

What steps can reproduce the bug?

Use Bun.serve to create a simple HTTP server. On one of the routes render a JSX file as the response. This works fine until you try using hooks. See minimal repro case in this repo:

https://github.com/BurlyBurr/bunjsxinvalidhookrepro

What is the expected behavior?

Expected no error. Can't see how there would be any version mismatch between react and react-dom or anything.

What do you see instead?

No response

Additional information

No response

[BurlyBurr]

And, of course hooks don't do anything dynamic in server-rendered code like this, but after solving this issue I can move on to adding the client JS in there for hydration.

[Jarred-Sumner]

This is a React SSR usage question and not a bug in Bun - converting to discussion

[johnnysprinkles]

Hmm, still blocked on this. Definitely only one version of react and react-dom so not sure how Bun itself is including a second version. So far I've tried messing with the JSX related compiler options to no avail. It would be a real pain to switch to Node or Deno now!

[johnnysprinkles]

Tried switching to preact just to see what happens and I get some error suggesting that duplicate copies of "preact" are in use. My only guess is that the Bun JSX loader for some reason uses a separate isolated copy of whatever's specified in "jsxImportSource". Definitely beyond my ability to debug.