Occulted Vite errors in dev mode Cloudflare - Error running module "

[tavoyne]

Reproduction

1. Start an RR app using the Cloudflare template:

npx create-react-router@latest --template remix-run/react-router-templates/cloudflare

2. Open /app/routes/home.tsx.

3. Change an import path to an intentionally incorrect one ("../welcome/welcome" → "/blabla").

4. Start the dev server.

npm run dev

5. Open http://localhost:5173/

System Info

System:
  OS: macOS 14.5
  CPU: (8) arm64 Apple M3
  Memory: 261.56 MB / 16.00 GB
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 22.18.0 - ~/.nvm/versions/node/v22.18.0/bin/node
  npm: 10.9.3 - ~/.nvm/versions/node/v22.18.0/bin/npm
Browsers:
  Chrome: 139.0.7258.68
  Safari: 17.5
npmPackages:
  @react-router/dev: ^7.7.1 => 7.8.0 
  react-router: ^7.7.1 => 7.8.0 
  vite: ^6.3.3 => 6.3.5

Used Package Manager

npm

Expected Behavior

I'm expecting the actual build error to be reported:

Actual Behavior

But I get this instead:

Note: if you launch the dev server before changing the import path, it will surface the right error until you reload the page or get a new HMR update.

[tavoyne]

Also, I noticed the template is using the unstable_viteEnvironmentApi flag. Might this be the issue?

Shouldn't the default template only rely on stable APIs, given that it's the source of truth and people expect it to work in production?

[fprl]

I have this same error, and it makes development quite hard, as you can have a small typo but you don't know where's the issue.

[0ctan33]

+1 makes development impossible

[sergiodxa]

Also, I noticed the template is using the unstable_viteEnvironmentApi flag. Might this be the issue?

Shouldn't the default template only rely on stable APIs, given that it's the source of truth and people expect it to work in production?

The Cloudflare Vite plugin relies on Vite env api so RR needs to use it too

Note the Vite api is stable, what's unstable is the support in RR plugin

[sergiodxa]

I got the error a few days ago, but I think the issue is not in RR but in the CF plugin

[lewsmith]

Same issue. It's making dev extremely difficult as theres no pointers to where the error is 😭

There is an open issue here

[tavoyne]

I got the error a few days ago, but I think the issue is not in RR but in the CF plugin

Yes it seems like - it’s thrown from the CF plugin code.

[tavoyne]

As a workaround you can build the app for prod and at least it’ll surface the error

[CaptainTrojan]

@tavoyne Good trick, thanks.

[RaphaelBronsveld]

The update in the Cloudflare Vite plugin should be almost available😄

cloudflare/workers-sdk#10655

Update: fix was released https://github.com/cloudflare/workers-sdk/releases/tag/%40cloudflare/vite-plugin%401.13.2