Procedure passed as argument to function loses type safety.
Hi there, I have a mystifying TS issue, where I lose type safety of my proc when I pass it as an argument to another function. I'm new to tRPC, and been doing a spike to see if we can adopt it at our company.
Full code example is in this TS playground: https://www.typescriptlang.org/play/?#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-r0nKDdfgfbgAANw5GFHASuwyhUqqxl2WKygXMw9KxCGhFYZGJwuIEkrQV2PaAemeW4OJZABaLrVn+TqBbQNIlZAARnSCRsl2YVXRBAB+XxazQOwmWA2QACYIMyZAsmgskRSlYJfBVCAUOZB4oHHfItQaOwgA
The issue is that with the definition of
I've simplified it to the point that
Has anyone had success with passing procedures to other functions without losing their type safety? I'm wondering if there's some typing helpers that I'm missing, or other creative ways of solving this problem.
Thanks for your time!
Env: Node 18, yarn 4.0.2, npm 10.5.0.
Full code example is in this TS playground: https://www.typescriptlang.org/play/?#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-r0nKDdfgfbgAANw5GFHASuwyhUqqxl2WKygXMw9KxCGhFYZGJwuIEkrQV2PaAemeW4OJZABaLrVn+TqBbQNIlZAARnSCRsl2YVXRBAB+XxazQOwmWA2QACYIMyZAsmgskRSlYJfBVCAUOZB4oHHfItQaOwgA
The issue is that with the definition of
createTRPCEndpointcreateTRPCEndpoint, the returned procedure loses the type definition of inputinput.I've simplified it to the point that
createTRPCEndpointcreateTRPCEndpoint has no utility, but we use it to dynamically create middleware that are configured by the options we pass in. It would be important to be able to enrich the procedure ctxctx type with the middleware. If we didn't, we could override and cast the return type of createTRPCEndpointcreateTRPCEndpoint as TT, and then the type safety of inputinput is preserved, but then we can't enrich ctxctx. Has anyone had success with passing procedures to other functions without losing their type safety? I'm wondering if there's some typing helpers that I'm missing, or other creative ways of solving this problem.
Thanks for your time!
Env: Node 18, yarn 4.0.2, npm 10.5.0.
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