How do I use toucan-js with Sentry Performance/Tracing about toucan-js HOT 2 OPEN

import { Toucan } from 'toucan-js';
import '@sentry/tracing';


type Env = {
	SENTRY_DSN: string;
};

export default {
	async fetch(request, env, context): Promise<Response> {
		const sentry = new Toucan({
			dsn: env.SENTRY_DSN,
			tracesSampleRate: 1.0,
			context,
			request,
		});

		const transaction = sentry.startTransaction({ name: 'someRandomName' });
		try {
			handler();
			return new Response('Hello!');
		} catch (e) {
			sentry.captureException(e);

			return new Response('Something went wrong! Team has been notified.', {
				status: 500,
			});
		} finally {
			transaction.finish();
		}
	},
} as ExportedHandler<Env>;