Describe the bug

With experimental.bundledDev: true on Vite 8.1.0, the dev server serves an app bundle that throws Uncaught ReferenceError: __reExport is not defined in the browser before the app mounts — so the entire app fails to boot under vite dev. The Rolldown re-export helper __reExport is referenced in the served /assets/index.js bundle but not defined in it.

Turning experimental.bundledDev off (standard Vite 8 dev) fixes it — the same app boots and runs correctly. vite build (production) is unaffected; the crash is specific to bundled dev mode.

This looks like the same family as the other bundledDev "runtime helper referenced but not emitted" reports:

• Vite 8.0.11 dev server: __BUNDLED_DEV__ and __SERVER_FORWARD_CONSOLE__ pass through unreplaced in /@vite/client (browser ReferenceError) #22419 (__BUNDLED_DEV__ unreplaced in /@vite/client, closed)
• experimental.bundledDev breaks non-bundled environments in multi-environment setups #22012 (bundledDev breaks non-bundled environments, open)
• Reference Error: __rolldown_runtime__ is not defined with bundledDev: true -- when importing an in-monorepo library and htat library's dependencies are specified in optimizeDeps.include (but not the library itself) rolldown-vite#563 (__rolldown_runtime__ is not defined with bundledDev: true when importing an in-monorepo library, closed)

…but the missing symbol here is __reExport (the export * re-export helper), which I couldn't find reported anywhere.

Reproduction

It reproduces 100% in a public SolidJS pnpm monorepo. The exact failing config is on this branch/PR:

• Repo: https://github.com/juspay/kolu — PR Upgrade to Vite 8.1 repo-wide (Rolldown/Oxc) juspay/kolu#1543
• The failing state is commit a5903a33 (where experimental.bundledDev: true was added to packages/client/vite.config.ts); the PR later removes the flag for this reason.
• Steps: check out that state, run the client dev server (packages/client, vite via the repo's dev tooling), open the client in a browser → console shows Uncaught ReferenceError: __reExport is not defined, blank app.

Minimal repro — not yet isolated (and a narrowing data point): a trivial export * from "./cjs-lib.cjs" re-export in a fresh Vite 8.1 + vite-plugin-solid app does not reproduce — there __reExport is correctly emitted and defined in the served /assets/index.js. So the trigger needs something more than a plain CJS star-re-export — most likely the monorepo workspace-library + optimizeDeps interaction that vitejs#563 describes for the sibling __rolldown_runtime__ helper. I'm happy to bisect kolu's dependency graph with maintainer guidance to land a minimal repro.

System Info

• vite: 8.1.0 (rolldown 1.1.2)
• vite-plugin-solid: 2.11.11
• @tailwindcss/vite: 4.2.2
• solid-js: 1.9.11
• node: 24.13.0
• pnpm: 10.32.1 (workspace monorepo; client imports several in-repo workspace:* source packages that re-export from each other and from npm deps)
• OS: Linux x86_64

Used Package Manager

pnpm