HW/final_project/src/store/reducers/auth-reducer.js

import jwtDecode from '../../helpers/jwt-decode'

export default function authReducer(state, { type, token }) {
    if (state === undefined) {
        if (localStorage.authToken) {
            type = "AUTH_LOGIN";
            token = localStorage.authToken;
        }
    }
    if (type === "AUTH_LOGIN") {
        let payload = jwtDecode(token);
        if (payload) {
            localStorage.authToken = token;
            return { token, payload };
        }
    }
    if (type === "AUTH_LOGOUT") {
        localStorage.removeItem("authToken");
        return {};
    }
    return state || {};
}