fix(replay): Improve error messages when compression worker fails to load#19008

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Merged
andreiborza merged 6 commits into from
Feb 10, 2026
Merged

fix(replay): Improve error messages when compression worker fails to load #19008

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c7b6799
fix(replay): Improve error messages when compression worker fails to …
billyvg Jan 27, 2026
4c7b78d
Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts
billyvg Jan 28, 2026
960c4d7
Apply suggestion from @billyvg
billyvg Jan 28, 2026
a442dd3
bump size limit
billyvg Feb 9, 2026
05bdf0a
Merge branch 'develop' into feat-replay-add-error-message-compression…
andreiborza Feb 10, 2026
6aa7ad1
Bump size limit
andreiborza Feb 10, 2026
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4 changes: 2 additions & 2 deletions .size-limit.js
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
path: 'packages/browser/build/npm/esm/prod/index.js',
import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
gzip: true,
limit: '98 KB',
limit: '99 KB',

@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged

Low Severity

Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.

Fix in CursorFix in Web

},
{
name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
name: 'CDN Bundle (incl. Tracing, Replay)',
path: createCDNPath('bundle.tracing.replay.min.js'),
gzip: true,
limit: '80 KB',
limit: '81 KB',
},
{
name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down
10 changes: 8 additions & 2 deletions packages/replay-internal/src/eventBuffer/WorkerHandler.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
if ((data as WorkerResponse).success) {
resolve();
} else {
reject();
DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
reject(new Error('Received worker message with unsuccessful status'));
}
},
{ once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
this._worker.addEventListener(
'error',
error => {
reject(error);
DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);

@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages

Low Severity

The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.

Additional Locations (1)

Fix in CursorFix in Web

reject(
new Error(
`Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
),
);

@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix

Low Severity · Bugbot Rules

This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."

Additional Locations (1)

Fix in CursorFix in Web

},
{ once: true },
);
Expand Down
Loading
, '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" + '

Skip to content
fix(replay): Improve error messages when compression worker fails to load#19008

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 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
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c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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
fix(replay): Improve error messages when compression worker fails to load#19008

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to your account

 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
Show file tree
Hide file tree
 Changes from all commits
Commits

Show all changes


6 commits


Select commit
Hold shift + click to select a range
c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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
fix(replay): Improve error messages when compression worker fails to load#19008

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

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 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
Show file tree
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 Changes from all commits
Commits

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6 commits


Select commit
Hold shift + click to select a range
c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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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fix(replay): Improve error messages when compression worker fails to load#19008

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 Merged

andreiborza
merged 6 commits into

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Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
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c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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
fix(replay): Improve error messages when compression worker fails to load#19008

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to your account

 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
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c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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('^' + ".*" + '

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fix(replay): Improve error messages when compression worker fails to load#19008

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 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
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c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
 },
 { once: true },
 );
Expand Down
Loading

, '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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fix(replay): Improve error messages when compression worker fails to load#19008

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 Merged

andreiborza
merged 6 commits into

from

Feb 10, 2026
 Merged


fix(replay): Improve error messages when compression worker fails to load
#19008
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c7b6799

fix(replay): Improve error messages when compression worker fails to …


billyvg Jan 27, 2026
4c7b78d

Update packages/replay-internal/src/eventBuffer/WorkerHandler.ts


billyvg Jan 28, 2026
960c4d7

Apply suggestion from @billyvg


billyvg Jan 28, 2026
a442dd3

bump size limit


billyvg Feb 9, 2026
05bdf0a

Merge branch 'develop' into feat-replay-add-error-message-compression…


andreiborza Feb 10, 2026
6aa7ad1

Bump size limit


andreiborza Feb 10, 2026

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4 changes: 2 additions & 2 deletions
.size-limit.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -89,7 +89,7 @@ module.exports = [
 path: 'packages/browser/build/npm/esm/prod/index.js',
 import: createImport('init', 'browserTracingIntegration', 'replayIntegration', 'feedbackIntegration'),
 gzip: true,
 limit: '98 KB',
 limit: '99 KB',
@cursorcursorBotFeb 9, 2026

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Bundle size increase in browser package flagged
Low Severity
Per the review rules: "Large bundle size increases in browser packages. Sometimes they're unavoidable but flag them anyway." The size limit for @sentry/browser (incl. Tracing, Replay, Feedback) was bumped from 98 KB to 99 KB. The increase comes from the new descriptive error message strings added to WorkerHandler. This is likely unavoidable given the goal of improving error messages, but worth noting.
Fix in CursorFix in Web
 },
 {
 name: '@sentry/browser (incl. Feedback)',
Expand DownExpand Up@@ -208,7 +208,7 @@ module.exports = [
 name: 'CDN Bundle (incl. Tracing, Replay)',
 path: createCDNPath('bundle.tracing.replay.min.js'),
 gzip: true,
 limit: '80 KB',
 limit: '81 KB',
 },
 {
 name: 'CDN Bundle (incl. Tracing, Replay, Logs, Metrics)',
Expand Down

10 changes: 8 additions & 2 deletions
packages/replay-internal/src/eventBuffer/WorkerHandler.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -33,7 +33,8 @@ export class WorkerHandler {
 if ((data as WorkerResponse).success) {
 resolve();
 } else {
 reject();
 DEBUG_BUILD && debug.warn('Received worker message with unsuccessful status', data);
 reject(new Error('Received worker message with unsuccessful status'));
 }
 },
 { once: true },
Expand All@@ -42,7 +43,12 @@ export class WorkerHandler {
 this._worker.addEventListener(
 'error',
 error => {
 reject(error);
 DEBUG_BUILD && debug.warn('Failed to load Replay compression worker', error);
@cursorcursorBotJan 28, 2026

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Redundant debug logging results in duplicate error messages
Low Severity
The new debug.warn calls at lines 36 and 46 are redundant because the caller EventBufferProxy._ensureWorkerIsLoaded() already logs these errors using debug.exception(). Looking at the logger implementation, debug.exception() logs both the message AND the error object to the console. This means when the worker fails to load, the same error appears multiple times in debug output - first as a warning from WorkerHandler, then as error logs from EventBufferProxy. The existing logging in EventBufferProxy provides more useful context (mentioning the fallback behavior), making the new logs unnecessary noise.
Additional Locations (1)
Fix in CursorFix in Web
 reject(
 new Error(
 `Failed to load Replay compression worker: ${error instanceof ErrorEvent && error.message ? error.message : 'Unknown error. This can happen due to CSP policy restrictions, network issues, or the worker script failing to load.'}`,
 ),
 );
@cursorcursorBotJan 27, 2026

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Missing test for improved error message regression fix
Low Severity · Bugbot Rules
This PR improves error messages when the compression worker fails to load, but no tests were added to verify the improved error messages are actually produced. The existing test at EventBufferProxy.test.ts only checks that the fallback buffer is used when the worker fails, not that the new descriptive Error objects are correctly constructed and rejected with the expected messages. Per the review rules: "When reviewing a fix PR, check if the PR includes at least one unit, integration or e2e test that tests the regression this PR fixes."
Additional Locations (1)
Fix in CursorFix in Web
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 { once: true },
 );
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