fix(@angular/build): improve error message when an unhandled exception occurs during prerendering

This change enhances the error messaging when an unhandled exception occurs during the prerendering process. The updated error message provides more context and clarity.

**Previous Behavior**

```
ng b
An unhandled exception occurred: Some error!!!
See "/tmp/ng-S2ABKF/angular-errors.log" for further details.
```

**Updated Behavior:**
```
ng b
Browser bundles
Initial chunk files     | Names               |  Raw size | Estimated transfer size
main-AFPIPGGK.js        | main                | 218.00 kB |                59.48 kB
polyfills-Z2GOM3BN.js   | polyfills           |  35.82 kB |                11.80 kB
styles-5INURTSO.css     | styles              |   0 bytes |                 0 bytes

                        | Initial total       | 253.82 kB |                71.28 kB

Server bundles
Initial chunk files     | Names               |  Raw size
server.mjs              | server              |   1.11 MB |
chunk-HZL5H5M5.mjs      | -                   | 526.77 kB |
polyfills.server.mjs    | polyfills.server    | 269.91 kB |
chunk-GFWAPST7.mjs      | -                   |  19.16 kB |
chunk-5XUXGTUW.mjs      | -                   |   2.55 kB |
render-utils.server.mjs | render-utils.server |   1.46 kB |
main.server.mjs         | main.server         | 149 bytes |

Lazy chunk files        | Names               |  Raw size
chunk-7YC4RJ5P.mjs      | xhr2                |  12.08 kB |

Prerendered 1 static route.
Application bundle generation failed. [4.923 seconds]

✘ [ERROR] An error occurred while prerendering route '/'.

Error: Some error!!!
    at render (node_modules/@angular/build/src/utils/server-rendering/render-worker.js:20:20)
    at /angular-cli/abc/node_modules/piscina/dist/worker.js:146:32
```

Closes #28212

Author: alan-agius4

packages/angular/build/src/utils/server-rendering/prerender.ts

@@ -81,7 +81,11 @@ export async function prerenderPages(
   }
 
   // Get routes to prerender
-  const { routes: allRoutes, warnings: routesWarnings } = await getAllRoutes(
+  const {
+    routes: allRoutes,
+    warnings: routesWarnings,
+    errors: routesErrors,
+  } = await getAllRoutes(
     workspaceRoot,
     outputFilesForWorker,
     assetsReversed,
@@ -92,11 +96,15 @@ export async function prerenderPages(
     verbose,
   );
 
+  if (routesErrors?.length) {
+    errors.push(...routesErrors);
+  }
+
   if (routesWarnings?.length) {
     warnings.push(...routesWarnings);
   }
 
-  if (allRoutes.size < 1) {
+  if (allRoutes.size < 1 || errors.length > 0) {
     return {
       errors,
       warnings,
@@ -190,22 +198,27 @@ async function renderPages(
       const isAppShellRoute = appShellRoute === route;
       const serverContext: ServerContext = isAppShellRoute ? 'app-shell' : 'ssg';
       const render: Promise<RenderResult> = renderWorker.run({ route, serverContext });
-      const renderResult: Promise<void> = render.then(({ content, warnings, errors }) => {
-        if (content !== undefined) {
-          const outPath = isAppShellRoute
-            ? 'index.html'
-            : posix.join(removeLeadingSlash(route), 'index.html');
-          output[outPath] = content;
-        }
-
-        if (warnings) {
-          warnings.push(...warnings);
-        }
-
-        if (errors) {
-          errors.push(...errors);
-        }
-      });
+      const renderResult: Promise<void> = render
+        .then(({ content, warnings, errors }) => {
+          if (content !== undefined) {
+            const outPath = isAppShellRoute
+              ? 'index.html'
+              : posix.join(removeLeadingSlash(route), 'index.html');
+            output[outPath] = content;
+          }
+
+          if (warnings) {
+            warnings.push(...warnings);
+          }
+
+          if (errors) {
+            errors.push(...errors);
+          }
+        })
+        .catch((err) => {
+          errors.push(`An error occurred while prerendering route '${route}'.\n\n${err.stack}`);
+          void renderWorker.destroy();
+        });
 
       renderingPromises.push(renderResult);
     }
@@ -231,7 +244,7 @@ async function getAllRoutes(
   prerenderOptions: PrerenderOptions,
   sourcemap: boolean,
   verbose: boolean,
-): Promise<{ routes: Set<string>; warnings?: string[] }> {
+): Promise<{ routes: Set<string>; warnings?: string[]; errors?: string[] }> {
   const { routesFile, discoverRoutes } = prerenderOptions;
   const routes = new RoutesSet();
   const { route: appShellRoute } = appShellOptions;
@@ -275,8 +288,12 @@ async function getAllRoutes(
     recordTiming: false,
   });
 
+  const errors: string[] = [];
   const { routes: extractedRoutes, warnings }: RoutersExtractorWorkerResult = await renderWorker
     .run({})
+    .catch((err) => {
+      errors.push(`An error occurred while extracting routes.\n\n${err.stack}`);
+    })
     .finally(() => {
       void renderWorker.destroy();
     });
@@ -285,7 +302,7 @@ async function getAllRoutes(
     routes.add(route);
   }
 
-  return { routes, warnings };
+  return { routes, warnings, errors };
 }
 
 function addLeadingSlash(value: string): string {

packages/angular_devkit/build_angular/src/builders/server/tests/behavior/build-errors_spec.ts

@@ -15,13 +15,14 @@ describeBuilder(execute, SERVER_BUILDER_INFO, (harness) => {
     it('emits errors', async () => {
       harness.useTarget('server', {
         ...BASE_OPTIONS,
-        watch: true,
       });
 
       // Generate an error
       await harness.appendToFile('src/main.server.ts', `const foo: = 'abc';`);
 
-      const { result, logs } = await harness.executeOnce();
+      const { result, logs } = await harness.executeOnce({
+        outputLogsOnFailure: false,
+      });
 
       expect(result?.success).toBeFalse();
       expect(logs).toContain(