fix(void): fail build and deploy when prerender pages fail

packages/void/src/cli/deploy-managed-full.ts

@@ -9,8 +9,8 @@ import {
 } from '../asset-routing.ts';
 import { type VoidConfig, isNodeTarget } from '../config.ts';
 import { collectRevalidate } from '../isr-config.ts';
-import { voidWarn } from '../log.ts';
 import { type DetectedFramework } from '../plugin-inference.ts';
+import { assertNoPrerenderFailures } from '../prerender-render.ts';
 import {
   collectPrerenderPaths,
   collectPrerenderPathsNode,
@@ -164,8 +164,8 @@ export async function runFullDeploy(
 
     if (result.paths.length === 0) {
       log.info('No pages to prerender');
-    } else if (result.failed.length > 0) {
-      voidWarn(`${formatCount(result.failed.length, 'page')} failed to prerender`);
+    } else {
+      assertNoPrerenderFailures(result.failed);
     }
   }
 

packages/void/src/plugin-prerender.ts

@@ -2,7 +2,8 @@ import { join } from 'pathslash';
 import type { Plugin } from 'vite';
 import { resolveDistDir, resolveWorkerDirName } from './cli/build-output-dir.ts';
 import { isNodeTarget, type VoidConfig } from './config.ts';
-import { voidLog, voidWarn, setShowTimestamp } from './log.ts';
+import { voidLog, setShowTimestamp } from './log.ts';
+import { assertNoPrerenderFailures } from './prerender-render.ts';
 import { prerenderPages, prerenderPagesNode } from './prerender.ts';
 import { resolveRemoteMode } from './shared/env.ts';
 
@@ -64,9 +65,7 @@ export function prerenderPlugin(root: string, config: VoidConfig): Plugin {
         return;
       }
 
-      if (result.failed.length > 0) {
-        voidWarn(`${result.failed.length} page(s) failed to prerender`);
-      }
+      assertNoPrerenderFailures(result.failed);
     },
   };
 }

packages/void/src/prerender-render.ts

@@ -9,6 +9,14 @@ export type PrerenderResult = {
   failed: Array<{ path: string; error: string }>;
 };
 
+export function assertNoPrerenderFailures(failed: PrerenderResult['failed']): void {
+  if (failed.length === 0) {
+    return;
+  }
+  const details = failed.map(({ path, error }) => `  ${path}: ${error}`).join('\n');
+  throw new Error(`${failed.length} page(s) failed to prerender:\n${details}`);
+}
+
 export function outputFileForPath(path: string): string {
   return path === '/' ? 'index.html' : `${path.slice(1)}.html`;
 }

packages/void/test/unit/prerender-render.test.ts

@@ -3,7 +3,10 @@ import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { afterEach, describe, expect, it } from 'vite-plus/test';
 import { serializePageData } from '../../src/pages/serialize.ts';
-import { renderPrerenderPaths } from '../../src/prerender-render.ts';
+import {
+  assertNoPrerenderFailures,
+  renderPrerenderPaths,
+} from '../../src/prerender-render.ts';
 import { createAssetFallback } from '../../src/runtime/routing-worker.ts';
 
 const roots: Array<string> = [];
@@ -199,3 +202,15 @@ describe('prerender pool', () => {
     });
   });
 });
+
+describe('assertNoPrerenderFailures', () => {
+  it('does nothing when there are no failures', () => {
+    expect(() => assertNoPrerenderFailures([])).not.toThrow();
+  });
+
+  it('throws with path details when prerender failed', () => {
+    expect(() =>
+      assertNoPrerenderFailures([{ path: '/throws', error: 'HTTP 500' }]),
+    ).toThrow('1 page(s) failed to prerender:\n  /throws: HTTP 500');
+  });
+});