fix(node): handle offshoot promise rejections (#10454)

* fix(node): handle offshoot promise rejections

* add test

* add changeset

* Update packages/integrations/node/test/errors.test.js

1 files changed, 16 insertions, 3 deletions

diff --git a/packages/integrations/node/src/serve-app.ts b/packages/integrations/node/src/serve-app.ts
index a9840b721..ac5af3add 100644
--- a/packages/integrations/node/src/serve-app.ts
+++ b/packages/integrations/node/src/serve-app.ts
@@ -1,3 +1,4 @@
+import { AsyncLocalStorage } from 'node:async_hooks';
 import { NodeApp } from 'astro/app/node';
 import type { RequestHandler } from './types.js';
 
@@ -7,8 +8,20 @@ import type { RequestHandler } from './types.js';
  * Intended to be used in both standalone and middleware mode.
  */
 export function createAppHandler(app: NodeApp): RequestHandler {
+	/**
+	 * Keep track of the current request path using AsyncLocalStorage.
+	 * Used to log unhandled rejections with a helpful message.
+	 */
+	const als = new AsyncLocalStorage<string>();
+	const logger = app.getAdapterLogger();
+	process.on('unhandledRejection', reason => {
+		const requestUrl = als.getStore();
+		logger.error(`Unhandled rejection while rendering ${requestUrl}`);
+		console.error(reason);
+	});
+
 	return async (req, res, next, locals) => {
-		let request;
+		let request: Request;
 		try {
 			request = NodeApp.createRequest(req);
 		} catch (err) {
@@ -19,11 +32,11 @@ export function createAppHandler(app: NodeApp): RequestHandler {
 
 		const routeData = app.match(request);
 		if (routeData) {
-			const response = await app.render(request, {
+			const response = await als.run(request.url, () => app.render(request, {
 				addCookieHeader: true,
 				locals,
 				routeData,
-			});
+			}));
 			await NodeApp.writeResponse(response, res);
 		} else if (next) {
 			return next();