TanStack Router support for multiple routers in the same app

[namukang]

I'm building a Chrome extension, which requires supporting multiple "apps" within the same app due to each UI entrypoint (options page, extension popup, side panel, etc.) being independent from other entrypoints.

In other words, the router for the side panel of a Chrome extension is completely separate from the router for the options page of a Chrome extension. Each page is essentially its own app that uses hash-based routing in order to support navigating within the app.

Unfortunately, TanStack Router's usage of declaration merging for type safety seems to limit an application to a single router.

Is this correct? It seems from @TkDodo's comment that this is a known limitation in TanStack Router and I'm curious if there are any possible workarounds.

Thanks!