Running dev/build on Start project fails with `Cannot find package '@rsbuild/core'` error

[pawelblaszczyk5]

Which project does this relate to?

Start

Describe the bug

Running project with TanStack Start fails since latest update 1.167.43, due to some @rsbuild/core import error:

pawelblaszczyk@Pawes-MacBook-Pro rsbuild-fail-repro % pnpm dev

> rsbuild-fail-repro@ dev /Users/pawelblaszczyk/dev/rsbuild-fail-repro
> vite dev --port 3000

failed to load config from /Users/pawelblaszczyk/dev/rsbuild-fail-repro/vite.config.ts
error when starting dev server:
Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@rsbuild/core' imported from /Users/pawelblaszczyk/dev/rsbuild-fail-repro/node_modules/.pnpm/@tanstack+start-plugin-core@1.168.0_@tanstack+react-router@1.168.23_react-dom@19.2.5_re_fe057eceb72183a95d1e288393ed9319/node_modules/@tanstack/start-plugin-core/dist/esm/rsbuild/planning.js

It occurs both with a blank project freshly created and with an existing project with more stuff.

Your Example Website or App

https://github.com/pawelblaszczyk5/rsbuild-fail-repro

Steps to Reproduce the Bug or Issue

1. Create a blank project
2. Make sure that you uses 1.167.43 version of @tanstack/react-start
3. Try to run dev/build
4. Observe error

Expected behavior

dev/build goes without import error

Screenshots or Videos

Platform

• Router / Start Version: As above
• OS: macOS
• Browser: n/a
• Browser Version: n/a
• Bundler: vite
• Bundler Version: 8.0.10

Additional context

No response

[jaspersmitNL]

Same issue here both on node/bun with npm/yarn/bun

[acoBOYZ]

Strange but after get this error with latest "@tanstack/react-start": "^1.167.43" downgrade version for stable one also throw same error for me even with proper clean and reinstall in my repo:

error when starting dev server:
Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@rsbuild/core' imported from /Users/ahmetcevdetozturk/Documents/0-app/@ekiply-mono/node_modules/.bun/@tanstack+start-plugin-core@1.168.0+120bed33c196a4ea/node_modules/@tanstack/st
art-plugin-core/dist/esm/rsbuild/planning.js
    at Object.getPackageJSONURL (node:internal/modules/package_json_reader:314:9)
    at packageResolve (node:internal/modules/esm/resolve:767:81)
    at moduleResolve (node:internal/modules/esm/resolve:853:18)
    at defaultResolve (node:internal/modules/esm/resolve:983:11)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:731:20)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:708:38)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:310:38)
    at ModuleJob._link (node:internal/modules/esm/module_job:182:49) {
  code: 'ERR_MODULE_NOT_FOUND'
}

[Eigilak]

Saaaame

[petebacondarwin]

This is because this PR added an import on the @rsbuild/core package but only marked it as an optional peer dependency: https://github.com/TanStack/router/pull/7228/changes#diff-42426ce0decec8ebe08ae36cce05c43ea711da41179b0973f1a722cd34eeec8aR100-R114

[petebacondarwin]

Workaround is simply to install @rsbuild/core after running the tanstack create command.

[cosmincartas]

I had to install nitro as well on a fresh project