vite-plugin-pwa incompatible with tanstack start production builds

Which project does this relate to?

Start

Describe the bug

vite-plugin-pwa's build steps (generate assets, generate serviceworker bundle) are seemingly not executed when running vite build with VitePWA() and tanstackStart() both present.

This is likely because to vite-plugin-pwa not having proper support for the Vite 6 environment API.
There is an open PR to solve this: https://github.com/vite-pwa/vite-plugin-pwa/pull/786, however the current state of this PR has the same issue as the stable version of the package.

No PWA/SW steps are ran in build:

but it works in the vite dev server:

Your Example Website or App

https://stackblitz.com/edit/github-djpcrmc9?file=src%2Frouter.tsx

Steps to Reproduce the Bug or Issue

1. npm install
2. npm run build
3. No PWA/SW steps are ran in build:

Expected behavior

• Build steps actually run during vite build
• Service worker gets built into tanstack start's client-dist, so it can also get picked up by nitro publicAssets[]
• Any script injection steps such as into also work(?)

Screenshots or Videos

No response

Platform

• Start Version: ^1.131.7
• OS: macOS, Stackblitz WebContainer
• Browser: Chrome
• Browser Version: 139.0.7258.66
• Bundler: Vite
• Bundler Version: ^6.3.5

Additional context

No response

Start with the linked StackBlitz example, especially src/router.tsx, and run npm install followed by npm run build. Compare the VitePWA() and tanstackStart() build behavior under Vite 6, including the expected service worker output in client-dist and Nitro publicAssets[]. Done means the PWA build and injection steps run during vite build.