RxJS Http 服務器與 typescript 編譯錯誤

Question

我是 rxjs 的新手，你能告訴我下面有什么問題嗎？

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;
      }
    )
  );

編譯錯誤：

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]'.

Answer 1

我發現我必須將fromEvent的第一個參數定義為：

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

否則 Typescript 認為它是FromEventTarget<unknown>