Cloudflare Developers•7mo ago

Interface return type in RPC functions for Service / WorkerEntrypoint

I'm trying to implement a RPC Service in my auth service worker that verifies a jwt token, but whenever import an interface type from another file, it infers the return type of the RPC to never. But when I turn that interface into a type instead of interface, it does work, why is that?

2 Replies

ItsWendellOP•7mo ago

I can cast the interface to a format that does work for type inference in the RPC calls:

export type ToType<T> = {
  [K in keyof T]: T[K];
};

export type ToType<T> = {
  [K in keyof T]: T[K];
};

JFSIII•6mo ago

Thanks for this! I am experiencing the same thing and I never would have thought to try type vs interface. I also have a situation where the return type shows undefined for a similar reason. If I use an interface to define the shape, or an unknown for a RHS then it'll break. If I use types and any then works as expected but UGH!

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Interface return type in RPC functions for Service / WorkerEntrypoint