loginReducer.js

const initialState = {
    loading: false,
    user: null,
    error: null
}

export default function (state = initialState, action) {
    switch(action.type) {
        case 'LOGIN_REQUEST':
            return {
                ...state,
                loading: true
            }
            
        case 'LOGIN_SUCCESS':
            return {
                ...state,
                loading: false,
                user: action.user
            }
            
        case 'LOGIN_FAILURE':
            return {
                ...state,
                loading: false,
                error: action.error
            }
            
        default:
            return state
    }
}