refactor(router-devtools-core): restore visibility into internalized cached and pending matches

[Sheraff]

after having internalized pendingMatches and cachedMatches (#6673), they are not accessible outside of router-core anymore.

This PR restores the devtools visibility into those matches by exposing them as a separate store, that will not have the overhead of being consumed throughout the app.

In a follow-up PR, we can further reduce the overhead of reactivity by using createServerStore instead of actual tanstack/store when not running on the client, or not running in dev mode.

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☁️ Nx Cloud last updated this comment at 2026-02-15 21:03:02 UTC

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commit: 03e62e5

[SeanCassiere]

If we're storing Reactive matches in a separate Store, I wonder if it makes sense to take Form's approach of exposing that store and using useStore for subscription to be documented.

const routerInternalPendingMatches = useStore(router.internalReactiveStore, s => s.pendingMatches);

This has the added benefit of providing a migration path for the dozens of users who were accessing the pending matches. We can say that, based on your use case, you should probably be just checking the status === 'pending', but if you absolutely need the pending and cached matches then you'll need to do this "extra legwork" to access it instead.

[Sheraff]

If we're storing Reactive matches in a separate Store, I wonder if it makes sense to take Form's approach of exposing that store and using useStore for subscription to be documented.

const routerInternalPendingMatches = useStore(router.internalReactiveStore, s => s.pendingMatches);

This has the added benefit of providing a migration path for the dozens of users who were accessing the pending matches. We can say that, based on your use case, you should probably be just checking the status === 'pending', but if you absolutely need the pending and cached matches then you'll need to do this "extra legwork" to access it instead.

That's a good point. I do like keeping stuff "private" / "internal" for more freedom for us, but if some people do actually use those things, we could mention it in the docs

[Sheraff]

If we're storing Reactive matches in a separate Store, I wonder if it makes sense to take Form's approach of exposing that store and using useStore for subscription to be documented.

const routerInternalPendingMatches = useStore(router.internalReactiveStore, s => s.pendingMatches);

This has the added benefit of providing a migration path for the dozens of users who were accessing the pending matches. We can say that, based on your use case, you should probably be just checking the status === 'pending', but if you absolutely need the pending and cached matches then you'll need to do this "extra legwork" to access it instead.

This would prevent an optimisation I was planning though: to not actually use a reactive store outside of NODE_ENV === 'development'. But then maybe w/ alien-signals (and in a case of zero subscribers) this wouldn't actually make a difference? I was planning on using createServerStore for prod, which is basically a pass-through store: same API, no reactivity.