Deploy.

node_modules/wrangler/templates/middleware/middleware-scheduled.ts

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+import type { Middleware } from "./common";
+
+// A middleware has to be a function of type Middleware
+const scheduled: Middleware = async (request, env, _ctx, middlewareCtx) => {
+	const url = new URL(request.url);
+	if (url.pathname === "/__scheduled") {
+		const cron = url.searchParams.get("cron") ?? "";
+		await middlewareCtx.dispatch("scheduled", { cron });
+
+		return new Response("Ran scheduled event");
+	}
+
+	const resp = await middlewareCtx.next(request, env);
+
+	// If you open the `/__scheduled` page in a browser, the browser will automatically make a request to `/favicon.ico`.
+	// For scheduled Workers _without_ a fetch handler, this will result in a 500 response that clutters the log with unhelpful error messages.
+	// To avoid this, inject a 404 response to favicon.ico loads on the `/__scheduled` page
+	if (
+		request.headers.get("referer")?.endsWith("/__scheduled") &&
+		url.pathname === "/favicon.ico" &&
+		resp.status === 500
+	) {
+		return new Response(null, { status: 404 });
+	}
+
+	return resp;
+};
+
+export default scheduled;