Clear localStorage on close tabs/browser

Clear localStorage on close tabs or browser

    ((nm, tm) => {
      const lStorage = localStorage;
      const sStorage = sessionStorage;
      const tabId = sStorage.getItem(tm)
        || ((newId) => {
          sStorage.setItem(tm, newId);
          return newId;
        })((Math.random() * 1e8).toFixed());
      const update = (setTabValue) => {
        let currentValue = JSON.parse(lStorage.getItem(nm) || '{}');
        const arrValue: number[] = Object.values(currentValue);
        if (setTabValue
          && typeof currentValue[tabId] === 'undefined'
          && !arrValue.reduce((sum, current) => { return sum + current; }, 0)) {
          lStorage.clear();
          currentValue = {};
        }
        currentValue[tabId] = setTabValue;
        lStorage.setItem(nm, JSON.stringify(currentValue));
      };
      update(1);
      window.onbeforeunload = () => { update(0); };
    })('tabs', 'tabid');