tunnelmole/dist/src/websocket/host-ip-websocket.d.ts

Tunnelmole, an open source ngrok alternative. Instant public URLs for any http/https based application. Available as a command line application or as an NPM dependency for your code. Stable and maintained. Good test coverage. Works behind firewalls

import WebSocket from 'ws';
export default class HostipWebSocket extends WebSocket {
    sendMessage(object: unknown): void;
}