runSaga(,secondparam,)应为哪种类型?如何创建?

我正在尝试编写一个处理登录的传奇故事的测试。下面是我的代码和遇到的问题:

const fakeStore = await runSaga(
 {
   getState: () => ({...state}),
   dispatch: (action) => dispatchedActions.push(action)
 },
 apis.user.login, // this where the issue is from
 payload
).done;

Tslint 错误消息:

Argument of type '(user: Authentication) => Promise<IUserResponse>' is not assignable to parameter of type 'Saga1<Authentication>'.
  Property 'next' is missing in type 'Promise<IUserResponse>' but required in type 'Iterator<any>'.

这是 apis.user

apis{
 user: {
  login: (user: Authentication):Promise<IUserResponse> =>
   axios.post('/api/login', user)
     .then((res) => res.data)
     .catch((res) => res.data || { message:"" }),
 }
}

我不知道该怎么做 Saga1 类型我查看了类型定义,下面是它的样子:

export function runSaga<A, S, T1>(
  storeInterface: RunSagaOptions<A, S>,
  saga: Saga1<T1>,
  arg1: T1): Task;

Saga1<T1>

type Saga1<T1> = (arg1: T1) => Iterator<any>;