node.js - RxJS Http Server with typescript compile errors

Question

I'm pretty newbie with rxjs, can you please tell what's wrong with below?

interface IHTTP {
    req: IncomingMessage;
    res: ServerResponse;
    handler?: Promise<any>;
}
server = http.createServer();
  let request$: Observable<any>;
  request$ = fromEvent(server, 'request').pipe(
    map(([req, res]: [IncomingMessage, ServerResponse]): IHTTP => {
        return { req, res } as IHTTP;
      }
    )
  );

Compile error:

TS2345: Argument of type 'OperatorFunction<[IncomingMessage, ServerResponse], IHTTP>' is not assignable to parameter of type 'OperatorFunction<unknown, IHTTP>'. ??Type 'unknown' is not assignable to type '[IncomingMessage, ServerResponse]'.

question from:https://stackoverflow.com/questions/65640917/rxjs-http-server-with-typescript-compile-errors

Answer 1

I found the problem I had to define fromEvent's first argument as:

server as FromEventTarget<[http.IncomingMessage, http.ServerResponse]>

Otherwise Typescript thinks it's FromEventTarget<unknown>