cloudflare--workers-sdk/fixtures/routing-app/functions/index.ts

export async function onRequest(
	context: EventContext<unknown, never, Record<string, unknown>>
) {
	// Contents of context object
	const {
		request, // same as existing Worker API
		env, // same as existing Worker API
		params, // if filename includes [id] or [[path]]
		waitUntil, // same as ctx.waitUntil in existing Worker API
		next, // used for middleware or to fetch assets
		data, // arbitrary space for passing data between middlewares
	} = context;

	return new Response("Hello, world!");
}