2021-04-019_12.tsx

const userReducer = createReducer(initialState, builder => {
    builder
        .addCase(attemptLogin, state => ({
            ...state,
            loginState: 'loading',
            message: 'loading',
        }))
        .addCase(setLogin, (state, action) => {
            const { email, newUser } = action.payload
            return {
                login: true,
                email,
                newUser,
            }
        })
        .addCase(setLogout, (state, action) => {
            const { loginState = 'loggedOut', message } = action.payload
            return {
                login: false,
                loginState,
                message,
            }
        })
})