http-client-singleton.js

class MainApi extends HttpClient {
  private static classInstance?: MainApi;

  private constructor() {
    super('https://api.awesome-site.com');
  }

  public static getInstance() {
    if (!this.classInstance) {
      this.classInstance = new MainApi();
    }

    return this.classInstance;
  }

  public getUsers = () => this.instance.get<User[]>('/users');

  public getUser = (id: string) => this.instance.get<User>(`/users/${id}`);
}