const client = new MongoClient('xx', { 
  createSocket(options) {
    return new MinimalSocketInterfaceImplemention();
  }
})

type MinimalSocketInterface = {
  // Optional, but sync IO to make a UUID occurs if these don't exist.
  remoteAddress: string;
  remotePort: number;
  // TCP specific
  setKeepAlive: (enable: boolean, initialDelayMS: number) => void;
  setTimeout: (timeoutMS: number) => void;
  setNoDelay: (noDelay: boolean) => void;
  // MessageStream requirement
  pipe: <T extends NodeJS.WritableStream = any>(stream: T) => void;
  // These are all used only during setup (connecting)
  on: (eventName: string, listener: (event: any) => void) => void;
  once: (eventName: string, listener: (event: any) => void) => void;
  emit: (eventName: string) => void;
  removeAllListeners: (eventName: string) => void;
  removeListener: (eventName: string) => void;
  // MessageStream internally calls write as Msgs are pushed to it
  write: (chunk: any) => void;
  // Two different shutdown APIs
  end: (callback: () => void) => void;
  destroy: () => void;
};