[Flight] Allow overriding request.timeOrigin via options.startTime - #35598

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[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
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lubieowoce:preserve-old-io-info

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@lubieowocelubieowoce commented Jan 22, 2026•
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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343
This leads to loss of debug info when a flight stream is deserialized and serialized again.
We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing

conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })

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Comparing: 5dad2b4...ddea9a9

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

Generated by 🚫 dangerJS against ddea9a9

@lubieowoce
lubieowoceforce-pushed the preserve-old-io-info branch 4 times, most recently from 4bdc1b0 to 7367c43CompareJanuary 22, 2026 15:43
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@lubieowocelubieowoce changed the title [Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
' in ' +
name +
(/\d/.test(m)
(/:\d+:\d+/.test(m)

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drive-by fix. detecting only numbers would make Component1 look like a source location.

@lubieowocelubieowoce mentioned this pull request Feb 2, 2026
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Comment threadpackages/react-markup/src/ReactMarkupServer.js Outdated
Comment threadpackages/react-server-dom-esm/src/server/ReactFlightDOMServerNode.js Outdated
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Comment threadpackages/react-noop-renderer/src/ReactNoopFlightServer.js Outdated
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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" + '

Skip to content
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
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@lubieowoce
@lubieowocelubieowoce
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Jan 22, 2026•

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
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Jan 22, 2026•

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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

Generated by 🚫 dangerJS against ddea9a9
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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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View reviewed changes
Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
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drive-by fix. detecting only numbers would make Component1 look like a source location.
@lubieowocelubieowoce
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Comment threadpackages/react-markup/src/ReactMarkupServer.js
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Comment threadpackages/react-server-dom-esm/src/server/ReactFlightDOMServerNode.js
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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
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
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@lubieowoce
@lubieowocelubieowoce
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Jan 22, 2026•

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
react-sizebot
commented
Jan 22, 2026•

edited

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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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View reviewed changes
Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
@lubieowocelubieowoceFeb 2, 2026

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drive-by fix. detecting only numbers would make Component1 look like a source location.
@lubieowocelubieowoce
mentioned this pull request
Feb 2, 2026
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Comment threadpackages/react-markup/src/ReactMarkupServer.js
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Comment threadpackages/react-server-dom-esm/src/server/ReactFlightDOMServerNode.js
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Comment threadpackages/react-noop-renderer/src/ReactNoopFlightServer.js
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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
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
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@lubieowoce
@lubieowocelubieowoce
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Jan 22, 2026•

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
react-sizebot
commented
Jan 22, 2026•

edited

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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
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Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
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drive-by fix. detecting only numbers would make Component1 look like a source location.
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@lubieowoce@react-sizebot@unstubbable

, '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" + '

Skip to content
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Conversation
@lubieowoce
@lubieowocelubieowoce
commented
Jan 22, 2026•

edited

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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View reviewed changes
Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
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drive-by fix. detecting only numbers would make Component1 look like a source location.
@lubieowocelubieowoce
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Feb 2, 2026
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Comment threadpackages/react-markup/src/ReactMarkupServer.js
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Comment threadpackages/react-server-dom-esm/src/server/ReactFlightDOMServerNode.js
Outdated

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Comment threadpackages/react-noop-renderer/src/ReactNoopFlightServer.js
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@unstubbable
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Feb 3, 2026
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@lubieowoce@react-sizebot@unstubbable

, '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
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Conversation
@lubieowoce
@lubieowocelubieowoce
commented
Jan 22, 2026•

edited

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
react-sizebot
commented
Jan 22, 2026•

edited

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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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commented
Feb 2, 2026
View reviewed changes
Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
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drive-by fix. detecting only numbers would make Component1 look like a source location.
@lubieowocelubieowoce
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Feb 2, 2026
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Comment threadpackages/react-markup/src/ReactMarkupServer.js
Outdated

Comment threadpackages/react-server-dom-esm/src/server/ReactFlightDOMServerNode.js
Outdated

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Comment threadpackages/react-noop-renderer/src/ReactNoopFlightServer.js
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@lubieowoce@react-sizebot@unstubbable

, '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
[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
Merged
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Feb 3, 2026
Merged
[Flight] Allow overriding request.timeOrigin via options.startTime#35598
unstubbable merged 4 commits into
react:mainfrom 
lubieowoce:preserve-old-io-info
Conversation
@lubieowoce
@lubieowocelubieowoce
commented
Jan 22, 2026•

edited

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
@react-sizebot
react-sizebot
commented
Jan 22, 2026•

edited

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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
lubieowoce
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commented
Feb 2, 2026
View reviewed changes
Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
@lubieowocelubieowoceFeb 2, 2026

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drive-by fix. detecting only numbers would make Component1 look like a source location.
@lubieowocelubieowoce
mentioned this pull request
Feb 2, 2026
 Merged

unstubbable
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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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[Flight] Allow overriding request.timeOrigin via options.startTime - #35598
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[Flight] Allow overriding request.timeOrigin via options.startTime#35598
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Jan 22, 2026•

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Currently, IO that finished before the request started is not considered IO:
https://github.com/facebook/react/blob/6a0ab4d2dd62dfdf8881ba1c3443c6d5acedc871/packages/react-server/src/ReactFlightServer.js#L5338-L5343

This leads to loss of debug info when a flight stream is deserialized and serialized again.

We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing
conststartTime=performance.now()+performance.timeOrigin// ... stuff happens and time passes...ReactServer.renderToReadableStream(...,{ startTime })
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Comparing: 5dad2b4...ddea9a9
Critical size changes
Includes critical production bundles, as well as any change greater than 2%:
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=609.91 kB609.91 kB=107.85 kB107.85 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB=1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=675.84 kB675.84 kB=118.81 kB118.81 kB
facebook-www/ReactDOM-prod.classic.js=695.47 kB695.47 kB=122.24 kB122.24 kB
facebook-www/ReactDOM-prod.modern.js=685.85 kB685.85 kB=120.63 kB120.63 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.production.js+1.80%2.44 kB2.49 kB+0.98%0.81 kB0.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-server.development.js+1.55%3.10 kB3.14 kB+0.74%0.95 kB0.95 kB

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[Flight] Allow overriding request.timeOrigin[Flight] Allow overriding request.timeOrigin via options.startTimeFeb 2, 2026
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Comment threadpackages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js
 ' in ' +
 name +
 (/\d/.test(m)
 (/:\d+:\d+/.test(m)
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drive-by fix. detecting only numbers would make Component1 look like a source location.
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