Local Storage with Expiry

/**
 * LocalStorage with expiry support
 */
const ExpiryStorage = {
  /**
   * Set item with expiry
   * @param key Storage key
   * @param value Value to store
   * @param ttl Time-to-live in milliseconds (default: 24h)
   */
  setItem<T>(key: string, value: T, ttl = 86400000): void {
    const item = {
      value,
      expiry: Date.now() + ttl
    };
    localStorage.setItem(key, JSON.stringify(item));
  },

  /**
   * Get item (returns null if expired)
   * @param key Storage key
   * @returns Stored value or null
   */
  getItem<T>(key: string): T | null {
    const itemStr = localStorage.getItem(key);
    if (!itemStr) return null;

    const item = JSON.parse(itemStr);
    if (Date.now() > item.expiry) {
      localStorage.removeItem(key);
      return null;
    }

    return item.value as T;
  },

  /**
   * Remove item
   * @param key Storage key
   */
  removeItem(key: string): void {
    localStorage.removeItem(key);
  },

  /**
   * Clear all items
   */
  clear(): void {
    localStorage.clear();
  }
};

// Usage Example
ExpiryStorage.setItem('user', { id: 1, name: 'John' }, 3600000); // 1 hour TTL
const user = ExpiryStorage.getItem('user'); // { id: 1, name: 'John' } (if not expired)