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Surface console output from workerd during Cloudflare prerendering #16307

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Merged
matthewp merged 4 commits into from
Apr 14, 2026
+22 −2
Merged

Surface console output from workerd during Cloudflare prerendering #16307

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5830864
Surface console output from workerd during prerendering
matthewp Apr 13, 2026
9cf9d59
Filter out HTTP request logs from prerender server output
matthewp Apr 14, 2026
7a41aca
Narrow log filter to only match internal __astro_ request paths
matthewp Apr 14, 2026
5a656c6
Fix lint: disable no-control-regex for ANSI pattern, use non-capturin…
matthewp Apr 14, 2026
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5 changes: 5 additions & 0 deletions .changeset/cloudflare-prerender-console-output.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@astrojs/cloudflare': patch
---

Surfaces `console.log` and `console.warn` output from workerd during prerendering
19 changes: 17 additions & 2 deletions packages/integrations/cloudflare/src/prerenderer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ import type {
AssetsGlobalStaticImagesList,
PathWithRoute,
} from 'astro';
import { preview, type PreviewServer as VitePreviewServer } from 'vite';
import { preview, createLogger, type PreviewServer as VitePreviewServer } from 'vite';
import { fileURLToPath } from 'node:url';
import { mkdir } from 'node:fs/promises';
import { cloudflare as cfVitePlugin, type PluginConfig } from '@cloudflare/vite-plugin';
Expand Down Expand Up @@ -53,6 +53,21 @@ export function createCloudflarePrerenderer({
// Ensure client dir exists (CF plugin expects it for assets)
await mkdir(clientDir, { recursive: true });

// Create a custom logger that filters out internal HTTP request logs (e.g. "POST /__astro_prerender 200 OK")
// from the Cloudflare vite plugin while still allowing user console.log output to pass through.
// We strip ANSI codes before testing because the Cloudflare vite plugin wraps messages in color codes.
const defaultLogger = createLogger('info');
// eslint-disable-next-line no-control-regex
const ansiRe = /\x1b\[[0-9;]*m/g;
const astroRequestLogRe = /^(?:GET|POST|PUT|DELETE|PATCH|HEAD|OPTIONS)\s+\/__astro_/;
const customLogger: ReturnType<typeof createLogger> = {
...defaultLogger,
info(msg, opts) {
if (astroRequestLogRe.test(msg.replace(ansiRe, ''))) return;
defaultLogger.info(msg, opts);
},
};

previewServer = await preview({
configFile: false,
base,
Expand All @@ -61,7 +76,7 @@ export function createCloudflarePrerenderer({
outDir: fileURLToPath(serverDir),
},
root: fileURLToPath(root),
logLevel: 'error',
customLogger,
preview: {
host: 'localhost',
port: 0, // Let the OS pick a free port
Expand Down
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