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)

[NullVoxPopuli]

Describe the bug

When I try to use bundledDev: true, I get an error that prevents my app from booting:

debug-BpoEGvGA.js:14 Uncaught ReferenceError: __rolldown_runtime__ is not defined
    at debug-BpoEGvGA.js:14:28

Reproduction

https://github.com/NullVoxPopuli/repro-vite-rolldown-bundledDev-error-with-__rolldown_runtime__
( this is a paired down fork of https://limber.glimdown.com/ )

Steps to reproduce

• clone the repro
• cd into repro
• have node 24 and pnpm 10.25
• pnpm i
• pnpm build
• cd apps/repl
• pnpm start (alias for vite --port 4201)
• visit https://localhost:4201
• observe error

NOTE: i'm still exploring what changes are needed for ember to provide the best rolldown/vite8 experience possible, so apologies for the mess in my vite.config <3

I'm still working on minimizing the library side of this repro, but the app reproduction is simply a single import, doesn't matter if it's used or not:

// in apps/repl/app/app.gts
import { getCompiler } from 'ember-repl';

I have a feeling this may have something to do with
packages/ember-repl/src/services/known-modules.ts -- as when I delete it (and all references) I can no longer reproduce the error) -- there are a lot of dynamic imports in here. I've moved this file to packages/ember-repl/src/index.ts for more direct reference.

I've been able to pair down these dynamic imports to just:

export const emberCompilationModules = {
  '@ember/template-compiler/runtime': () => import('@ember/template-compiler/runtime'),
  'content-tag': () => import('content-tag'),
};

If I remove either one of them, the error goes away, but having both brings the error.

of note, content-tag contains a wasm file (and has exports conditions for node vs not-node-ESM etc), and @ember/template-compiler/runtime is resolved via another plugin (resolver from @embroider/vite) and points at node_modules/ember-source/dist/packages/@ember/template-compiler/runtime.js

However!!

I don't think this problem is unique to the combination of these two dependencies, as since upgrading to vite8-beta.2, my big multi-million line project at work (which doesn't load content-tag or the runtime template-compiler) has the same issue

System Info

❯ npx envinfo --system --npmPackages '{vite,rolldown-vite,@vitejs/*,rollup,rolldown}' --binaries --browsers
Need to install the following packages:
envinfo@7.21.0
Ok to proceed? (y) y


  System:
    OS: macOS 15.6.1
    CPU: (16) arm64 Apple M4 Max
    Memory: 11.76 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.12.0 - /Users/psego/.proto/tools/node/24.12.0/bin/node
    Yarn: 4.10.3 - /Users/psego/.proto/shims/yarn
    npm: 11.6.2 - /Users/psego/.proto/tools/node/24.12.0/bin/npm
    pnpm: 10.25.0 - /Users/psego/.proto/shims/pnpm
    bun: 1.3.3 - /Users/psego/.proto/shims/bun
  Browsers:
    Chrome: 143.0.7499.110
    Firefox: 145.0.2
    Safari: 26.1
  npmPackages:
    vite: 8.0.0-beta.2 => 8.0.0-beta.2


(also happens on linux tho)

Used Package Manager

pnpm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.