Deno.WebSocketUpgrade - Deno documentation
interface Deno.WebSocketUpgrade

The object that is returned from a Deno.upgradeWebSocket request.

Properties

response: Response

The response object that represents the HTTP response to the client, which should be used to the RequestEvent .respondWith() for the upgrade to be successful.

socket: WebSocket

The WebSocket interface to communicate to the client via a web socket.