johste•12mo ago

Need help identifying the generic client side type of procedures

Hi! I think my question is better explained by what I'm trying to achive than anything else: I like to create a function called "subscribe" that can receive any subscription procedure and subscribe to it: e.g (sudo code):

const onRandomNumberRecived = (n: number) => {}
subscribe(trpc.randomNumber, onRandomNumberRecived);

const onRandomNumberRecived = (n: number) => {}
subscribe(trpc.randomNumber, onRandomNumberRecived);

Below is the infered type, but I'm pretty sure there is an generic type to represent such a thing "somewhere":

(property) randomNumber: {
    subscribe: SubscriptionResolver<BuildProcedure<"subscription", {
        _config: RootConfig<{
            ctx: {};
            meta: object;
            errorShape: DefaultErrorShape;
            transformer: DefaultDataTransformer;
        }>;
        _ctx_out: {};
        _input_in: typeof unsetMarker;
        _input_out: typeof unsetMarker;
        _output_in: typeof unsetMarker;
        _output_out: typeof unsetMarker;
        _meta: object;
    }, Observable<{randomNumber: number;}, unknown>>>;

(property) randomNumber: {
    subscribe: SubscriptionResolver<BuildProcedure<"subscription", {
        _config: RootConfig<{
            ctx: {};
            meta: object;
            errorShape: DefaultErrorShape;
            transformer: DefaultDataTransformer;
        }>;
        _ctx_out: {};
        _input_in: typeof unsetMarker;
        _input_out: typeof unsetMarker;
        _output_in: typeof unsetMarker;
        _output_out: typeof unsetMarker;
        _meta: object;
    }, Observable<{randomNumber: number;}, unknown>>>;

I've been digging through the source code, but so far I had no luck reproducing it. Have anyone attempted something similar?

1 Reply

Kseikyo•12mo ago

I'm not sure what you're trying to do, but if you're trying to get the type for subscribe, you can use the inferRouterInputs

/**
 * Inference helper for inputs.
 *
 * @example type HelloInput = RouterInputs['example']['hello']
 */
export type RouterInputs = inferRouterInputs<AppRouter>;

/**
 * Inference helper for outputs.
 *
 * @example type HelloOutput = RouterOutputs['example']['hello']
 */
export type RouterOutputs = inferRouterOutputs<AppRouter>;

/**
 * Inference helper for inputs.
 *
 * @example type HelloInput = RouterInputs['example']['hello']
 */
export type RouterInputs = inferRouterInputs<AppRouter>;

/**
 * Inference helper for outputs.
 *
 * @example type HelloOutput = RouterOutputs['example']['hello']
 */
export type RouterOutputs = inferRouterOutputs<AppRouter>;