Merge two tRPC routers or at least mount both in Next.js when they have completely different contexts.

[ethndotsh]

I have two routers, one called AuroraRouter which is a reference to a Fastify tRPC server living in another folder in my monorepo, and AppRouter which is the local tRPC server in the Next.js app where I am trying to mount both. They both have very different contexts, and different auth requirements but both need to be used with React Query. What's the best way to mount/merge/use both using the pages dir, with tanstack query?

[Nick-Lucas]

You might benefit from this example: https://github.com/trpc/trpc/tree/main/examples/soa

[ethndotsh]

The issue with that one is that it seems that the contexts need to be the same

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[ethndotsh]

Alright - that’s a little difficult because the scope of the two tRPC servers is completely different.

[KATT]

They only need to be the same for the error formatting to work. So really that's all that should be needed technically, feel free to open a feature request to make this work

[ethndotsh]

Will do, thank you!

[ashburnham]

Did you manage it?

[ethndotsh]

No but I opened a feature request #5113

[rjay98]

FYI just adding some more context (variations of this have been floating around). I suspect a common point in the lifecycle of customers will involve a separate server migration with the ability to do piece-wise changes. Having global context definitely gets in the way of this. We're monkey-patching this a bit, but I can also foresee a future where different teams own different trpc servers that manage different services.