How to use the @airbrake/node.Notifier function in @airbrake/node

async function main() {
  const airbrake = new Airbrake.Notifier({
    projectId: process.env.AIRBRAKE_PROJECT_ID,
    projectKey: process.env.AIRBRAKE_PROJECT_KEY,
  });

  console.log(pg.Client.prototype.query);

  const client = new pg.Client();
  await client.connect();

  const app = express();

  // This middleware should be added before any routes are defined.
  app.use(airbrakeExpress.makeMiddleware(airbrake));

  app.get('/', async function home(req, res) {
    const result = await client.query('SELECT $1::text as message', [

if(process.env.AIRBRAKE_PROJECT_ID) {
  const Airbrake = require('@airbrake/node');
  let airBrake = null;

  try {
    airBrake = new Airbrake.Notifier({
      projectId: process.env.AIRBRAKE_PROJECT_ID,
      projectKey: process.env.AIRBRAKE_API_KEY,
    });
  } catch (error) {
    airBrake = null;
    console.error(error);
  }

  module.exports = airBrake;
}

.createServer(function(req, res) {
    if (req.url === '/favicon.ico') {
      res.writeHead(404);
      res.end();
      return;
    }

    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello World\n');
    throw new Error('I am an uncaught exception');
  })
  .listen(8080);

console.log('Server running on port 8080.');

var airbrake = new Airbrake.Notifier({
  projectId: process.env.AIRBRAKE_PROJECT_ID,
  projectKey: process.env.AIRBRAKE_PROJECT_KEY,
});