Solid.js 'multiple instances' warnings appear in React apps with Vite 8

Commencez par la reproduction minimale liée et sa configuration Vite, puis comparez le comportement du serveur de développement avec Vite 7 et Vite 8. Examinez l’intégration Vite de TanStack devtools et le chemin de résolution de Solid.js signalé ; le travail est considéré comme terminé lorsque la configuration Vite 8 n’émet plus les avertissements concernant les instances dupliquées et la libération, sans dépendre du workaround de déduplication signalé.

TanStack Devtools version

@tanstack/react-devtools v0.10.1, @tanstack/devtools-vite v0.6.0

Framework/Library version

React 19.2.4, TanStack Start 1.167.16, Vite 8.0.3

Describe the bug and the steps to reproduce it

When using TanStack Devtools in a React TanStack Start app with Vite 8, the following warnings appear in the terminal and browser when starting the dev server

❯ bun run dev
$ vite dev --port 3000

  VITE v8.0.3  ready in 1039 ms

  ➜  Local:   http://localhost:3000/
  ➜  Network: use --host to expose
  ➜  press h + enter to show help
[vite] connected.
9:48:32 AM [vite] (client) [console.warn] You appear to have multiple instances of Solid. This can lead to unexpected behavior.
9:48:32 AM [vite] (client) [console.warn] You appear to have multiple instances of Solid. This can lead to unexpected behavior.
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed
9:48:32 AM [vite] (client) [console.warn] cleanups created outside a `createRoot` or `render` will never be run
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed
9:48:32 AM [vite] (client) [console.warn] cleanups created outside a `createRoot` or `render` will never be run
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed
9:48:32 AM [vite] (client) [console.warn] cleanups created outside a `createRoot` or `render` will never be run
9:48:32 AM [vite] (client) [console.warn] cleanups created outside a `createRoot` or `render` will never be run
9:48:32 AM [vite] (client) [console.warn] computations created outside a `createRoot` or `render` will never be disposed

These warnings do not appear with Vite 7 using the exact same dependencies and configuration.

Steps to reproduce:

1. Clone the repro repo and install dependencies:

   git clone https://github.com/abed-daloopa/tanstack-devtools-solid-warnings
   cd tanstack-devtools-solid-warnings
   bun install
   

2. Run the dev server:

   bun run dev
   

3. Open http://localhost:3000 — warnings appear in the browser console and terminal.

To verify Vite 8 is the cause, downgrade to Vite 7:

- "vite": "^8.0.3"
+ "vite": "^7.3.1"

Or add resolve.dedupe: ["solid-js"] to vite config

Reinstall and run ➡︎ warnings disappear.

Root cause: Vite 8 resolves Solid.js as multiple instances at runtime, even when only one copy exists in node_modules. Vite correctly deduplicates it.

Note: Adding resolve.dedupe: ["solid-js"] to the Vite config fixes the issue.

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://github.com/abed-daloopa/tanstack-devtools-solid-warnings

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

Maybe

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