[solid-query] Uncaught (in promise) Error: experimental_prefetchInRender feature flag is not enabled

[BierDav]

Describe the bug

When using the latest version of tanstack-query you get at least in solidjs for each query this error message in the console:

Uncaught (in promise) Error: experimental_prefetchInRender feature flag is not enabled

Your minimal, reproducible example

https://codesandbox.io/p/github/BierDav/temp-tanstack-query-ssr-bug/experimental-flag-warning

Steps to reproduce

1. Just start it using bun i && bun dev

Expected behavior

No error message in the console, because the promise wasn't even accessed

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

• OS: Windows, Linux

Tanstack Query adapter

solid-query

TanStack Query version

v5.59.13

TypeScript version

No response

Additional context

I have looked into the code. It is not really that something went wrong, and more about that the promise which causes this issue is evaluated even though the feature is not set.

Probably the easiest solution is to replace the promise when the flag is not enable with a getter function which then only throws the error, when the promise is really accessed.

[TkDodo]

Note: i can’t access your sandbox - it’s likely set to private.

I see no error in the Solid Query Simple example:

https://stackblitz.com/github/tanstack/query/tree/main/examples/solid/simple?embed=1&theme=dark&preset=node&file=src/index.tsx

[indeyets]

we see this issue too in our setup. (solid-start, without bun)

@TkDodo the url in example is pasted 2 times. just copy one of the halves. opens fine here

[PeterDraex]

StackBlitz link for the same repo:
https://stackblitz.com/~/github.com/BierDav/temp-tanstack-query-ssr-bug
After waiting for the dev server to start, I had to click on "http://localhost:3000/" in the terminal. Then I see JSON in the preview and the error in browser console.

I'm also experiencing the experimental_prefetchInRender feature flag error in my SolidJS project.

[BierDav]

we see this issue too in our setup. (solid-start, without bun)

@TkDodo the url in example is pasted 2 times. just copy one of the halves. opens fine here

sorry for that i fixed it

[0-don]

having the same issue, this seems to be happening since 5.59.0

[YosefBayoude]

Can confirm, rolling back to 5.56.2 does not present this.
Even in the docs own example this issue is present https://tanstack.com/query/latest/docs/framework/solid/examples/solid-start-streaming ; to see it happening go to the "mixed" page for example and reload, issue appears in the console

[PeterDraex]

@YosefBayoude I rolled back to 5.45.0 which doesn't have this issue

[TkDodo]

codesandobx still doesn’t work for me, but stackblitz does: https://stackblitz.com/github/BierDav/temp-tanstack-query-ssr-bug/tree/experimental-flag-warning

@KATT this promise rejection shows up in the solid-js adapter:

query/packages/query-core/src/queryObserver.ts

Lines 89 to 93 in 5d69ad7

	if (!this.options.experimental_prefetchInRender) {
	this.#currentThenable.reject(
	new Error('experimental_prefetchInRender feature flag is not enabled'),
	)
	}

Not sure why it works for react though 🤔

Is there a better place where we can reject the promise - or should we do it at all?

[vlad99902]

@TkDodo have the same issue in React (

[KATT]

This is odd, we add a .catch(() => to prevent this:

query/packages/query-core/src/thenable.ts

Lines 52 to 54 in 06e315c

	thenable.catch(() => {
	// prevent unhandled rejection errors
	})

Can this be a Vite-thing or something? 🤔

[TkDodo]

@vlad99902 I haven’t seen this in react so far - can you make a reproduction for that please?

[BierDav]

This issue doesn't affect react