Caching System

/**
 * Global cache storage instance
 */
const caches: CacheStorage;

/**
 * Cache storage management system
 */
class CacheStorage {
  /**
   * Opens a named cache, creating it if it doesn't exist
   * @param cacheName - Name of the cache to open
   * @returns Promise resolving to Cache instance
   */
  open(cacheName: string): Promise<Cache>;
  
  /**
   * Checks if a named cache exists
   * @param cacheName - Name of the cache to check
   * @returns Promise resolving to boolean
   */
  has(cacheName: string): Promise<boolean>;
  
  /**
   * Deletes a named cache
   * @param cacheName - Name of the cache to delete
   * @returns Promise resolving to boolean indicating success
   */
  delete(cacheName: string): Promise<boolean>;
  
  /**
   * Returns an array of cache names
   * @returns Promise resolving to array of cache names
   */
  keys(): Promise<string[]>;
}

import { caches } from 'undici';

// Open a cache
const cache = await caches.open('api-responses');

// Store a response
const response = await fetch('https://api.example.com/data');
await cache.put('https://api.example.com/data', response.clone());

// Retrieve cached response
const cachedResponse = await cache.match('https://api.example.com/data');
if (cachedResponse) {
  const data = await cachedResponse.json();
}

// Check if cache exists
const exists = await caches.has('api-responses');

// Delete cache
await caches.delete('api-responses');

/**
 * Individual cache instance
 */
class Cache {
  /**
   * Adds a request/response pair to the cache
   * @param request - Request to use as key
   * @param response - Response to cache
   * @returns Promise resolving when stored
   */
  put(request: RequestInfo, response: Response): Promise<void>;
  
  /**
   * Retrieves a cached response for the request
   * @param request - Request to match
   * @param options - Match options
   * @returns Promise resolving to Response or undefined
   */
  match(request: RequestInfo, options?: CacheQueryOptions): Promise<Response | undefined>;
  
  /**
   * Retrieves all cached responses matching the request
   * @param request - Request to match (optional)
   * @param options - Match options
   * @returns Promise resolving to array of Responses
   */
  matchAll(request?: RequestInfo, options?: CacheQueryOptions): Promise<Response[]>;
  
  /**
   * Adds a request to the cache, fetching the response
   * @param request - Request to fetch and cache
   * @returns Promise resolving when cached
   */
  add(request: RequestInfo): Promise<void>;
  
  /**
   * Adds multiple requests to the cache
   * @param requests - Array of requests to fetch and cache
   * @returns Promise resolving when all are cached
   */
  addAll(requests: RequestInfo[]): Promise<void>;
  
  /**
   * Deletes cached entries matching the request
   * @param request - Request to match
   * @param options - Match options
   * @returns Promise resolving to boolean indicating if entries were deleted
   */
  delete(request: RequestInfo, options?: CacheQueryOptions): Promise<boolean>;
  
  /**
   * Returns all cached request objects
   * @param request - Request to match (optional)
   * @param options - Match options
   * @returns Promise resolving to array of Requests
   */
  keys(request?: RequestInfo, options?: CacheQueryOptions): Promise<Request[]>;
}

interface CacheQueryOptions {
  ignoreSearch?: boolean;
  ignoreMethod?: boolean;
  ignoreVary?: boolean;
}

const cacheStores: {
  /**
   * In-memory cache store implementation
   */
  MemoryCacheStore: typeof MemoryCacheStore;
  
  /**
   * SQLite-based persistent cache store implementation
   */
  SqliteCacheStore: typeof SqliteCacheStore;
};

/**
 * In-memory cache implementation
 */
class MemoryCacheStore {
  constructor(options?: MemoryCacheStoreOptions);
}

/**
 * SQLite-based persistent cache implementation
 */
class SqliteCacheStore {
  constructor(options?: SqliteCacheStoreOptions);
}

interface MemoryCacheStoreOptions {
  maxSize?: number;
  maxAge?: number;
}

interface SqliteCacheStoreOptions {
  location?: string;
  maxSize?: number;
}

import { cacheStores } from 'undici';

// Create custom cache store
const memoryStore = new cacheStores.MemoryCacheStore({
  maxSize: 100,
  maxAge: 300000 // 5 minutes
});

const sqliteStore = new cacheStores.SqliteCacheStore({
  location: './cache.db',
  maxSize: 1000
});