Aristokrat- govno na rukave

const headerNavMenu = document.querySelector('.headerNav > ul');

const menuToggle = () => {
  const value = headerNavMenu.style.display;
  headerNavMenu.style.display = (value == 'none' || value == '') ? 'flex' : 'none';
}  

[...document.querySelectorAll('.mobileButton, .closeMobileMenu, .headerNav > ul > li')]
.forEach(el => el.addEvenetListener('click', menuToggle));

this.configDb = (({ user, password, connectString }) => ({ user, password, connectString }))(c);

var c = {
      user: "User",
      password: "Password",
      connectString: "Connect String",
    };
var configDb = (({ user, password, connectString }) => ({ user, password, connectString }))(c);

console.log(configDb)
// Object { user: "User", password: "Password", connectString: "Connect String" }

let timerTab =[];
timerTab.push([10,new Date().getTime()+6000]);
timerTab.push([11,new Date().getTime()+9000]);

setInterval(function () {
    const now = Date.now();
    timerTab = timerTab.filter(function (timer) {
        if (timer[1] <= now) {
            console.info("Таймер истек", timer[0]);
            return false; // не войдет в выбранные
        } else {
            console.info(`${timer[0]}: ${timer[1] - now}`);
            return true; // войдет в выбранные
        }
    })
}, 1000)