如何在打字稿中返回null

Question

在以下情况下，在UserAction.LOGOUT_REQUESTED的情况下，我需要返回null。我该怎么做？或者有更好的方法吗？

public static reducer(state: ILoginReducerState = UserReducer.initialState, action: ILogInAction): ILoginReducerState {
    switch (action.type) {
 case UserAction.LOGOUT_REQUESTED:
            return null}

ILoginReducerState定义如下

export interface IlogIn
{ 
userName : string,
password:string,
error:boolean
}

export interface ILoginReducerState 
{
readonly loading: boolean
readonly currentUser: IlogIn
readonly errors?: string
}

现在我遇到错误[ts]类型'null'无法分配给类型'ILoginReducerState'。

private static readonly initialState: ILoginReducerState = {
    currentUser: {
        error:false,
        password:'',
        userName:'',
    },
    errors:'',
    loading: false,
};