react-logo/frontend/src/reducers/session.reducers.js

import { LOGIN_SUCCESS } from "../actions/auth.actions";

const initialState = {
    isLoggedIn: false,
    user: null,
};

export function sessionReducer(state = initialState, action) {
    switch(action.type) {
        case LOGIN_SUCCESS:
                return handleLoginSuccess(state, action);
    };
    return state;
}

function handleLoginSuccess(state, action) {
    return {
        ...state,
        isLoggedIn: true,
        user: {
            username: action.username,
        },
    }
};