import { WebSocket as WS } from 'ws'; abstract class WebSocketHandler { public static Event = { CONNECTION: 'connection', MESSAGE: 'message', CLOSE: 'close', ERROR: 'error' }; public abstract onConnect: (ws: WS) => any; public abstract onMessage: (message: string) => any; public abstract onError: () => any; public abstract onClose: (code?: number, reason?: string) => any; } export { WebSocketHandler };