gistfile1.txt

const pingEpic = (action$) => action$
  .pipe(
    filter((action: IAction) => action.type === 'PING'),
    mergeMap((action: IAction) =>
      ajax({
        method: "GET",
        url: apiURL() + "/party/" + action.payload
      })
        .pipe(
          mergeMap((data) => {
            return merge([
              { type: "hello", payload: {} },
              { type: "cama", payload: {} }
            ])
          }),
          catchError((error) => {
            console.log(error)
            return merge([{ type: "olga" }, { type: "errro" }])
          })
        )
    )
  )