从redux reducer返回流类型没有捕获错误

Question

我有一个流类型UserState，我将其定义为reducer的返回类型。我在返回类型中添加了一个额外的hey道具，但没有收到错误。我本来期待Property not found in object type无论如何，如果有人知道我做错了什么，我很乐意听到。感谢。

type UserState = {
  +female?: boolean,
}

const user = (state: UserState = {}, action: ReduxFetchUserAction): UserState => {
  switch (action.type) {
    case types.FETCH_USER_SUCCESS: {
      const newUser = { ...state, ...action.user, hey: 'whatgives' }
      return newUser
    }
    default:
      return state
  }
}

export default user