Dev server broken with @tanstack/solid-start and @cloudflare/vite-plugin

[jakst]

Which project does this relate to?

Start

Describe the bug

After setting up the Cloudflare plugin on a @tanstack/solid-start project, the dev server gives this error on start:

error when starting dev server:
Error: The following environment options are incompatible with the Cloudflare Vite plugin:
        - "ssr" environment: `resolve.external`: ["@solid-primitives/refs","tiny-invariant","@tanstack/history","@solid-devtools/logger","@tanstack/router-core","tiny-warning","isbot","@tanstack/store"]
To resolve this issue, avoid setting `resolve.external` in your Cloudflare Worker environments.

    at validateWorkerEnvironmentOptions (file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/@cloudflare+vite-plugin@1.13.7_vite@7.1.7_tsx@4.20.6__workerd@1.20250924.0_wrangler@4.40.2/node_modules/@cloudflare/vite-plugin/dist/index.js:17244:11)
    at BasicMinimalPluginContext.configResolved (file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/@cloudflare+vite-plugin@1.13.7_vite@7.1.7_tsx@4.20.6__workerd@1.20250924.0_wrangler@4.40.2/node_modules/@cloudflare/vite-plugin/dist/index.js:17373:11)
    at file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/vite@7.1.7_tsx@4.20.6/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:35994:87
    at Array.map (<anonymous>)
    at resolveConfig (file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/vite@7.1.7_tsx@4.20.6/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:35994:68)
    at async _createServer (file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/vite@7.1.7_tsx@4.20.6/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:28008:67)
    at async CAC.<anonymous> (file:///Users/jakst/code/tmp/solid-start-solid-rc-broken/node_modules/.pnpm/vite@7.1.7_tsx@4.20.6/node_modules/vite/dist/node/cli.js:573:18)
 ELIFECYCLE  Command failed with exit code 1.

Running pnpm vite build && pnpm wrangler dev or pnpm vite preview, works as expected.

Note that I haven't tried any of the actual integrations with Cloudflare. This is just for getting it running.

Your Example Website or App

https://github.com/jakst/solid-start-solid-rc-broken/tree/cloudflare-broken

Steps to Reproduce the Bug or Issue

1. Clone the repo
2. Make sure you are on the cloudflare-broken branch
3. Install deps
4. Run pnpm dev. You should get the error message from above.

Expected behavior

I expect the dev server to work when using the Cloudflare Vite plugin with Tanstack Solid Start.

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.132.23/1.132.24
• OS: MacOs v15.6.1
• Browser: Chrome
• Browser Version: v140
• Bundler: Vite
• Bundler Version: 7.1.7

Additional context

No response

[schiller-manuel]

reported upstream issue

[HoaX7]

@jakst can you share your vite.config.ts? Im facing same issue even with the workaround. I keep getting this error getContextId cannot be used under non-hydrating context with tanstack start + solid + cloudflare. This only happens in dev.

[HoaX7]

@schiller-manuel any insights?

[jakst]

@HoaX7 I used the workaround that someone commented on Manuel's upstream issue.

Add this to the vite plugin list

plugins: [
  {
    // Workaround for https://github.com/solidjs/vite-plugin-solid/issues/232
    name: "remove-ssr-external",
    configResolved(config) {
      if (config.environments.ssr)
        config.environments.ssr.resolve.external = [];
    },
  },
  // ...
]

[HoaX7]

@jakst I used this workaround too but then ran into other issues. Were you able to run everything locally in dev? I pulled your code and tried it myself and ran into issues.
I created an issue #5338 explaining the bug

[jakst]

Interesting. You're right, that issue is there on my reproduction. I'm not getting it on our main application, which is where I used the workaround. I wonder why I'm not seeing it there 🤔

[HoaX7]

maybe you have a different config? can you help me with the plumbing if you dont mind. otherwise im thinking of moving to solid start haha until tanstack is more stable

[jakst]

I might be able too look into what makes the difference in a bit, but until then, I'd recommend just going with v1.131.x. It works great for us for now. We had a bunch of issues with solid-start with Cloudflare as well, so I wouldn't count on that path being smooth sailing either. They're also ditching vinxi in a bit which is bound to create some more breakage.

[HoaX7]

Thanks! Appreciate it