Vinnie Posts

Vinnie

•Created by Vinnie on 5/12/2024 in #❓-help

Infer context from procedure after middleware

I'm using trpc version 10 on pnpm. I I have my handler functions in separate files from the routers themselves. I'm looking to type the context correctly based on the procedure the handler is used with. Currently I am setting the ctx type from the Context type that is inferred from the createContext function.

export type GetPreferencesHandlerOptions = {
  ctx: Context;
};

export const getPreferencesHandler = async ({
  ctx,
}: GetPreferencesHandlerOptions) => {
  const { viewer } = ctx;
          // /\
          // ||
          // Viewer | undefined

  // ... rest of code
}

export type GetPreferencesHandlerOptions = {
  ctx: Context;
};

export const getPreferencesHandler = async ({
  ctx,
}: GetPreferencesHandlerOptions) => {
  const { viewer } = ctx;
          // /\
          // ||
          // Viewer | undefined

  // ... rest of code
}

The context type should rather be inferred from the privateProcedure so the changes which are made to the context in middlewares will also be correctly typed. I did see the inferProcedureBuilderResolverOptions helper type, but it is only available in version 11, and version 11 hasn't been released yet. Is there a way to do this in v10? https://trpc.io/docs/server/procedures#inferProcedureBuilderResolverOptions

4 replies