websocket-connection.js

console.log(`Received socket connectionId: ${event.requestContext && event.requestContext.connectionId}`);
       if (!(event.requestContext && event.requestContext.connectionId)) {
           throw new Error('Invalid event. Missing `connectionId` parameter.');
       }
       const connectionId = event.requestContext.connectionId;
       const route = event.requestContext.routeKey;
       console.log(`data from ${connectionId} ${event.body}`);
       const connection = new Client(connectionId);
       const response = { statusCode: 200, body: '' };
 
       if (route === '$connect') {
           console.log(`Route ${route} - Socket connectionId connectedconected: ${event.requestContext && event.requestContext.connectionId}`);
           await new Client(connectionId).connect();
           return response;
       }