Cloudflare RSC in data mode erroring during dev

[ivogt]

Cloudflare RSC in data mode erroring during dev

What I found is that the request for http://localhost:5173/__vite_rsc_load_module_dev_proxy?environmentName=ssr&entryName=index

Errors with this error:

Error: Stream ended before root value was parsed
    at file:///....../react-router/node_modules/turbo-stream/dist/turbo-stream.mjs:808:19
    at <anonymous>

Reproduction

https://github.com/ivogt/rr-cloudflare-rsc-failing

Based on Hi-Ogawa's https://github.com/vitejs/vite-plugin-react/tree/08-31-feat_rsc_react-router_cloudflare_single_worker_example

System Info

System:
    OS: macOS 26.0.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 2.06 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.18.0 - /Users/ivotodorov/.nvm/versions/node/v22.18.0/bin/node
    Yarn: 1.22.22 - /Users/ivotodorov/.nvm/versions/node/v22.18.0/bin/yarn
    npm: 10.9.3 - /Users/ivotodorov/.nvm/versions/node/v22.18.0/bin/npm
    pnpm: 10.12.1 - /Users/ivotodorov/Library/pnpm/pnpm
    bun: 1.2.21 - /Users/ivotodorov/.bun/bin/bun
  Browsers:
    Chrome: 141.0.7390.123
    Edge: 141.0.3537.99
    Safari: 26.0.1
  npmPackages:
    react-router: ^7.9.4 => 7.9.4 
    vite: ^7.1.10 => 7.1.10

Used Package Manager

yarn

Expected Behavior

Starting vite should work during dev

Actual Behavior

Starting dev errors on first request but works if compiled.