Proxy Pattern in TypeScript

http-service-proxy.ts

class HttpServiceProxy {
  private httpService: HttpService;
  private dataCache: Map<string, any> = new Map();

  constructor() {
    this.httpService = new HttpService();
  }

  async sendRequest(method: string, url: string, body?: BodyInit) {
    const cacheKey = method + ":" + url;
    if (this.dataCache.has(cacheKey)) {
      console.log(`Use key: ${cacheKey} to get cached data`);
      return this.dataCache.get(cacheKey);
    }
    const response = await this.httpService.sendRequest(method, url, body);
    this.dataCache.set(cacheKey, response);
    return response;
  }
}