DangerZone•5mo ago

Property 'error' does not exist on type 'MiddlewareOKResult<any>'.

Hello, I am building an trpc adapter for nestjs, and I am trying to extend some of trpc's functionality, specifically the procedure middleware by creating a procedure class.

import {
  type DataTransformerOptions,
  type RootConfig,
  type unsetMarker,
} from '@trpc/server';

import type { MiddlewareFunction } from '@trpc/server/src/core/middleware';

type ProcedureParams<Context = any> = {
  _config: RootConfig<{
    ctx: object & Context;
    meta: object;
    errorShape: never;
    transformer: DataTransformerOptions;
  }>;
  _ctx_out: object & Context;
  _input_in: typeof unsetMarker;
  _input_out: typeof unsetMarker;
  _output_in: typeof unsetMarker;
  _output_out: typeof unsetMarker;
  _meta: object;
}

export interface TRPCProcedure<Context = object> {
  use: MiddlewareFunction<ProcedureParams<Context>, ProcedureParams<Context>>
}

import {
  type DataTransformerOptions,
  type RootConfig,
  type unsetMarker,
} from '@trpc/server';

import type { MiddlewareFunction } from '@trpc/server/src/core/middleware';

type ProcedureParams<Context = any> = {
  _config: RootConfig<{
    ctx: object & Context;
    meta: object;
    errorShape: never;
    transformer: DataTransformerOptions;
  }>;
  _ctx_out: object & Context;
  _input_in: typeof unsetMarker;
  _input_out: typeof unsetMarker;
  _output_in: typeof unsetMarker;
  _output_out: typeof unsetMarker;
  _meta: object;
}

export interface TRPCProcedure<Context = object> {
  use: MiddlewareFunction<ProcedureParams<Context>, ProcedureParams<Context>>
}

I am using the MiddlewareFunction here so it will provide the correct opts implementation. Everything works perfectly, but when I am trying to run it, I am getting a typescript error:

../../node_modules/.pnpm/@trpc+server@10.18.0/node_modules/@trpc/server/src/core/internals/procedureBuilder.ts:387:20 - error TS2339: Property 'error' does not exist on type 'MiddlewareResult<any>'.
  Property 'error' does not exist on type 'MiddlewareOKResult<any>'.

387       throw result.error;
                       ~~~~~

../../node_modules/.pnpm/@trpc+server@10.18.0/node_modules/@trpc/server/src/deprecated/internals/procedure.ts:244:20 - error TS2339: Property 'error' does not exist on type 'MiddlewareResult<any>'.
  Property 'error' does not exist on type 'MiddlewareOKResult<any>'.

244       throw result.error;
                       ~~~~~

[6:26:38 PM] Found 2 errors. Watching for file changes.

../../node_modules/.pnpm/@trpc+server@10.18.0/node_modules/@trpc/server/src/core/internals/procedureBuilder.ts:387:20 - error TS2339: Property 'error' does not exist on type 'MiddlewareResult<any>'.
  Property 'error' does not exist on type 'MiddlewareOKResult<any>'.

387       throw result.error;
                       ~~~~~

../../node_modules/.pnpm/@trpc+server@10.18.0/node_modules/@trpc/server/src/deprecated/internals/procedure.ts:244:20 - error TS2339: Property 'error' does not exist on type 'MiddlewareResult<any>'.
  Property 'error' does not exist on type 'MiddlewareOKResult<any>'.

244       throw result.error;
                       ~~~~~

[6:26:38 PM] Found 2 errors. Watching for file changes.

Anyone has an idea of how to solve this? I thought about using the ProcedureBuilder interface but couldn't make it to work.

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