fix: handle middleware loading error

.changeset/selfish-rings-occur.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Correctly handle the error in case the middleware throws a runtime error

packages/astro/src/core/middleware/loadMiddleware.ts

@@ -1,16 +1,22 @@
 import type { ModuleLoader } from '../module-loader/index.js';
 import { MIDDLEWARE_MODULE_ID } from './vite-plugin.js';
+import type { Logger } from '../logger/core.js';
 
 /**
  * It accepts a module loader and the astro settings, and it attempts to load the middlewares defined in the configuration.
  *
  * If not middlewares were not set, the function returns an empty array.
  */
-export async function loadMiddleware(moduleLoader: ModuleLoader) {
+export async function loadMiddleware(moduleLoader: ModuleLoader, logger: Logger) {
 	try {
 		const module = await moduleLoader.import(MIDDLEWARE_MODULE_ID);
 		return module;
-	} catch {
+	} catch (e: any) {
+		logger.error(
+			'middleware',
+			"Astro couldn't load the middleware because the module contains an error."
+		);
+		logger.error('middleware', e.stack || e.message);
 		return void 0;
 	}
 }

packages/astro/src/vite-plugin-astro-server/route.ts

@@ -187,7 +187,7 @@ export async function handleRoute({
 	let mod: ComponentInstance | undefined = undefined;
 	let options: SSROptions | undefined = undefined;
 	let route: RouteData;
-	const middleware = await loadMiddleware(moduleLoader);
+	const middleware = await loadMiddleware(moduleLoader, logger);
 
 	if (!matchedRoute) {
 		if (config.i18n) {