Svelte renderer build fails after upgrading to Vite 8 / electron-vite 6.0.0-beta.1

[YImhof]

Describe the bug

Electron-Vite is a real great tool, making Electron dev a lot more accessible.
I'm trying to upgrade a working Electron application (Electron 41 + Electron-Vite 5 + Vite 7 + Svelte 5 + Typescript 6) to Electron 42+ and Vite 8, but the renderer build fails with 3 errors, complaining with message "Expected token }".

I also tried with a fresh minimal project and obtained the same errors (zip archive of the project included).

minimal-electron-test.zip

Steps to reproduce:

(using pnpm 11.22 as package manager)

1. npm create @quick-start/electron@latest, selecting Svelte and TypeScript.
2. pn dev (make sure the application based on old packages versions can start)
3. pn up --latest (update all dependencies)
4. pn add -d typescript@6.0.3 (rollback to TS 6 as waiting for TS 7.1)
5. pn add -d electron-vite@6.0.0-beta.1
6. pn build

Actual result:

message "Expected token }" on following files:

• [plugin vite-plugin-svelte:compile] rolldown/runtime.js 
• [plugin vite-plugin-svelte:compile] src/renderer/src/main.ts
• [plugin vite-plugin-svelte:compile] svelte/src/internal/client/index.js

Additional observations:

• main build succeeds.
• preload build succeeds.
• renderer build fails.
• reproduces in a clean project.
• reproduces with Vite 8.0.0, 8.0.16, 8.2.1 and 8.2.2.
• svelte-check passes.
• no custom Vite or Svelte configuration required to reproduce.

Custom debug transform

Adding a simple custom debug transform shows following output:

• TRANSFORM: rolldown/runtime.js
• TRANSFORM: .../src/renderer/index.html
• TRANSFORM: .../src/renderer/src/main.ts
• TRANSFORM: .../node_modules/.pnpm/svelte@5.56.10_@typescript-eslint+types@8.67.0/node_modules/svelte/src/internal/client/index.js

Note: sorry when duplicate, but I cannot read chinese characters.

Electron-Vite Version

6.0.0-beta.1

Electron Version

43.4.1

Vite Version

8.2.2

Validations

• Follow the Code of Conduct.
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[YImhof]

Electron 41.x.y has reached end-of-support, so availability of official electron-vite 6.0.0 would be a great step.
Or is there a recommended alternative?