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import { Data } from '../data/data.ts';
/** * Upgrade the request to a websocket connection. *  * @param data - The request data to upgrade. * @example * upgrade(data); *  * @returns A socket if the upgrade was successful, otherwise null.*/export function upgrade(data: Data): WebSocket | null {  if (data.request.headers['upgrade'] != 'websocket') return null;
  const request = new Request(data.request.url.href, {    headers: data.request.headers,  });
  const { socket, response } = Deno.upgradeWebSocket(request);  data.respond({ body: response as unknown as string });
  return socket;}