feat(astro): Add support for Astro on CF Workers - #19265

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closes#19215
closes JS-1656

This allows to deploy Astro on CF Workers and instrument it with Sentry

The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.

I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.

Future ideas

However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts

With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.

Merge checks

  • Create docs issue to update Astro on Cloudflare docs

@JPeer264JPeer264 self-assigned this Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%

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Comment threadpackages/astro/src/integration/index.ts
);
process.exit(1);
}
}

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Cloudflare package check crashes build when server SDK disabled

Low Severity

The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.

Additional Locations (1)

Fix in CursorFix in Web

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looks good from my side just a few small comments/questions

Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc Outdated
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts Outdated
@JPeer264
JPeer264force-pushed the jp/astro-on-cf-workers branch from d12a669 to 668d30eCompareFebruary 13, 2026 13:01
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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.

Comment threadpackages/astro/src/integration/cloudflare.ts

if (!defaultExportMatch) {
return undefined;
}

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Cloudflare entry wrapping fails on newer adapters

Medium Severity

The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.

Fix in CursorFix in Web

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That is alright. The export won't change for v12 🤞

@JPeer264JPeer264 mentioned this pull request Feb 18, 2026
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Support Astro on Cloudflare Workers

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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feat(astro): Add support for Astro on CF Workers - #19265
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JPeer264 merged 3 commits into
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Feb 18, 2026
Merged
feat(astro): Add support for Astro on CF Workers#19265
JPeer264 merged 3 commits into
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
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Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
View base workflow run
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Outdated

Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
Outdated

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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
@JPeer264JPeer264
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Feb 18, 2026

Closed

@JPeer264
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merged commit 7a328f4
into
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Support Astro on Cloudflare Workers


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(astro): Add support for Astro on CF Workers - #19265
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Feb 18, 2026
Merged
feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
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Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
View base workflow run
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
nicohrubec
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Outdated

Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
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Feb 18, 2026

Closed

@JPeer264
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merged commit 7a328f4
into
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(astro): Add support for Astro on CF Workers - #19265
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feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
self-assigned this
Feb 10, 2026
@linear
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JS-1656 Support Astro on Cloudflare Workers
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
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Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
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Support Astro on Cloudflare Workers


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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feat(astro): Add support for Astro on CF Workers - #19265
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feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
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Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
View base workflow run
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
nicohrubec
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Outdated

Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
@JPeer264JPeer264
mentioned this pull request
Feb 18, 2026

Closed

@JPeer264
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merged commit 7a328f4
into
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jp/astro-on-cf-workers

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@logaretmlogaretm
mentioned this pull request
Feb 20, 2026
 Closed

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Support Astro on Cloudflare Workers


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(astro): Add support for Astro on CF Workers - #19265
Merged
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Feb 18, 2026
Merged
feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
self-assigned this
Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
View base workflow run
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
nicohrubec
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Feb 12, 2026
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Outdated

Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
@JPeer264JPeer264
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Feb 18, 2026

Closed

@JPeer264
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merged commit 7a328f4
into
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40 checks passed

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Support Astro on Cloudflare Workers


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(astro): Add support for Astro on CF Workers - #19265
Merged
JPeer264 merged 3 commits into
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Feb 18, 2026
Merged
feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
@JPeer264JPeer264
self-assigned this
Feb 10, 2026
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
View base workflow run
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
Fix in CursorFix in Web
nicohrubec
nicohrubec
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
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Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
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That is alright. The export won't change for v12 🤞
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Support Astro on Cloudflare Workers


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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feat(astro): Add support for Astro on CF Workers - #19265
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feat(astro): Add support for Astro on CF Workers#19265
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closes#19215

closes JS-1656
This allows to deploy Astro on CF Workers and instrument it with Sentry
The main issue was that within CF Workers everything needs to be wrapped with withSentry from the @sentry/cloudflare SDK. With this PR the config cannot be changed via code and it is for now only possible to update the config on Cloudflare via Environment Variables.
I couldn't come up with a nice solution to have the config and bundle it with the entrypoint of @astro/cloudflare.
Future ideas
However, in @astro/cloudflare@13 the entry point is not exporting a function anymore, but a real module: https://github.com/withastro/astro/blob/%40astrojs/cloudflare%4013.0.0-beta.6/packages/integrations/cloudflare/src/entrypoints/server.ts
With this we could possibly change the entrypoint entirely to a Sentry entrypoint where withSentry is available as code.
Merge checks
  •  Create docs issue to update Astro on Cloudflare docs
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JS-1656 Support Astro on Cloudflare Workers
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Comment threadpackages/astro/src/integration/index.ts
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Comment threadpackages/astro/src/integration/index.ts
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Codecov Results 📊
Generated by Codecov Action
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Comment threadpackages/astro/src/integration/index.ts
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node-overhead report 🧳
Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,682-9,512-9%
GET With Sentry1,66619%1,616+3%
GET With Sentry (error only)5,93568%6,033-2%
POST Baseline1,193-1,197-0%
POST With Sentry59850%590+1%
POST With Sentry (error only)1,04888%1,051-0%
MYSQL Baseline3,269-3,335-2%
MYSQL With Sentry47815%464+3%
MYSQL With Sentry (error only)2,69482%2,689+0%
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Comment threadpackages/astro/src/integration/index.ts
 );
 process.exit(1);
 }
 }
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Cloudflare package check crashes build when server SDK disabled
Low Severity
The @sentry/cloudflare package resolution check with process.exit(1) runs unconditionally for Cloudflare adapters, regardless of whether sdkEnabled.server is true. The @sentry/cloudflare package is only needed when the server SDK is enabled (as it's used by the sentryCloudflareVitePlugin inside the if (sdkEnabled.server) block). A user deploying to Cloudflare with enabled: { server: false, client: true } who hasn't installed @sentry/cloudflare would have their build crash unnecessarily. The check belongs inside the sdkEnabled.server guard.
Additional Locations (1)
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looks good from my side just a few small comments/questions
Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
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Comment threaddev-packages/e2e-tests/test-applications/astro-5-cf-workers/wrangler.jsonc
Comment threadpackages/astro/src/integration/cloudflare.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/astro/src/integration/cloudflare.ts

 if (!defaultExportMatch) {
 return undefined;
 }
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Cloudflare entry wrapping fails on newer adapters
Medium Severity
The transform only wraps exports matching export default <identifier>;. Cloudflare adapter entrypoints that export objects or expressions do not match this regex, so withSentry is never applied. In those builds, Worker requests bypass Cloudflare instrumentation, and server paths like actions/API routes lose the intended Cloudflare request isolation and runtime behavior.
Fix in CursorFix in Web
@JPeer264JPeer264Feb 13, 2026

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That is alright. The export won't change for v12 🤞
@JPeer264JPeer264
mentioned this pull request
Feb 18, 2026

Closed

@JPeer264
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merged commit 7a328f4
into
developFeb 18, 2026

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jp/astro-on-cf-workers

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February 18, 2026 08:38
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Support Astro on Cloudflare Workers


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