stream.js

addEventListener('fetch', event => {
	event.respondWith(streamResponse(event))
});

async function streamResponse (event) {
	let readable = new ReadableStream({
		start (controller) {
			setInterval(() => {
				controller.enqueue('Hello stream!' + '\n');
			}, 1000);
		}
	});

	return new Response(readable, {
		status: 200
	})
}