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[Flight] Allow passing DEV only startTime as an option - #34912

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sebmarkbage merged 2 commits into
react:mainfrom
sebmarkbage:starttimeoption
Oct 19, 2025
Merged

[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom
sebmarkbage:starttimeoption

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@sebmarkbagesebmarkbage commented Oct 19, 2025

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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.

When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).

This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.

@github-actionsgithub-actionsBot added the React Core Team Opened by a member of the React Core Team label Oct 19, 2025
@react-sizebot

react-sizebot commented Oct 19, 2025

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Comparing: 58bdc0b...f57283f

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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f

@sebmarkbage
sebmarkbage merged commit 2cfb221 into react:mainOct 19, 2025
246 checks passed
@nextjs-botnextjs-bot mentioned this pull request Oct 20, 2025
Merged
sebmarkbage pushed a commit to vercel/next.js that referenced this pull request Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte mentioned this pull request Jun 5, 2026
Closed
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@sebmarkbage@react-sizebot@acdlite
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Oct 19, 2025

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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
added
the 
React Core Team
Opened by a member of the React Core Team
label
Oct 19, 2025
@react-sizebot
react-sizebot
commented
Oct 19, 2025

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Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

246 checks passed

@nextjs-botnextjs-bot
mentioned this pull request
Oct 20, 2025
 Merged

sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
 Closed

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@sebmarkbage@react-sizebot@acdlite

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Oct 19, 2025

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Contributor
When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
added
the 
React Core Team
Opened by a member of the React Core Team
label
Oct 19, 2025
@react-sizebot
react-sizebot
commented
Oct 19, 2025

Copy link


Copy Markdown

Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

246 checks passed

@nextjs-botnextjs-bot
mentioned this pull request
Oct 20, 2025
 Merged

sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
 Closed

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@acdliteacdliteacdlite approved these changes
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3 participants

@sebmarkbage@react-sizebot@acdlite

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Oct 19, 2025

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Contributor
When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
added
the 
React Core Team
Opened by a member of the React Core Team
label
Oct 19, 2025
@react-sizebot
react-sizebot
commented
Oct 19, 2025

Copy link


Copy Markdown

Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

246 checks passed

@nextjs-botnextjs-bot
mentioned this pull request
Oct 20, 2025
 Merged

sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
 Closed

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@acdliteacdliteacdlite approved these changes
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3 participants

@sebmarkbage@react-sizebot@acdlite

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
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[Flight] Allow passing DEV only startTime as an option - #34912
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sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
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Oct 19, 2025

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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
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Oct 19, 2025
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Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
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react:mainOct 19, 2025

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mentioned this pull request
Oct 20, 2025
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sebmarkbage pushed a commit
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Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
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Jun 5, 2026
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
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Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

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mentioned this pull request
Oct 20, 2025
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sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
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@sebmarkbage@react-sizebot@acdlite

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Oct 19, 2025

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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
added
the 
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Opened by a member of the React Core Team
label
Oct 19, 2025
@react-sizebot
react-sizebot
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Oct 19, 2025

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Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

246 checks passed

@nextjs-botnextjs-bot
mentioned this pull request
Oct 20, 2025
 Merged

sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
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@sebmarkbage@react-sizebot@acdlite

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
[Flight] Allow passing DEV only startTime as an option by sebmarkbage · Pull Request #34912 · react/react · GitHub
Skip to content
[Flight] Allow passing DEV only startTime as an option - #34912
Merged
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Oct 19, 2025
Merged
[Flight] Allow passing DEV only startTime as an option#34912
sebmarkbage merged 2 commits into
react:mainfrom 
sebmarkbage:starttimeoption
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
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Oct 19, 2025

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When you use the createFromFetch API we assume that the start time of the request is the same time as when you call createFromFetch but in principle you could use it with a Promise that starts earlier and just happens to resolve to a Response.
When you use createFromReadableStream that is almost definitely the case. E.g. you might have started it way earlier and you don't call createFromReadableStream until you get the headers back (the fetch promise resolves).
This adds an option to pass in the start time for debug purposes if you started the request before starting to parse it.
@github-actionsgithub-actionsBot
added
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Opened by a member of the React Core Team
label
Oct 19, 2025
@react-sizebot
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Oct 19, 2025

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Comparing: 58bdc0b...f57283f
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=6.68 kB6.68 kB+0.05%1.83 kB1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=605.41 kB605.41 kB=107.21 kB107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.69 kB6.69 kB+0.05%1.83 kB1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=664.38 kB664.38 kB=117.09 kB117.09 kB
facebook-www/ReactDOM-prod.classic.js=688.25 kB688.25 kB=121.13 kB121.13 kB
facebook-www/ReactDOM-prod.modern.js=678.67 kB678.67 kB=119.48 kB119.49 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB
Significant size changes
Includes any change greater than 0.2%:
Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
facebook-react-native/react/cjs/React-dev.js+0.56%52.61 kB52.91 kB+0.57%11.61 kB11.67 kB
oss-experimental/react/cjs/react.development.js=51.34 kB50.63 kB=11.55 kB11.40 kB
oss-stable/react/cjs/react.development.js=49.19 kB48.48 kB=11.16 kB11.02 kB
oss-stable-semver/react/cjs/react.development.js=49.17 kB48.46 kB=11.14 kB10.99 kB
facebook-www/React-dev.classic.js=56.01 kB55.17 kB=12.32 kB12.19 kB
facebook-www/React-dev.modern.js=56.00 kB55.17 kB=12.32 kB12.18 kB
oss-experimental/react/cjs/react.react-server.development.js=39.21 kB38.50 kB=9.18 kB9.04 kB
oss-stable/react/cjs/react.react-server.development.js=31.64 kB30.93 kB=7.53 kB7.39 kB
oss-stable-semver/react/cjs/react.react-server.development.js=31.61 kB30.90 kB=7.50 kB7.36 kB

Generated by 🚫 dangerJS against f57283f
@sebmarkbage
sebmarkbage
merged commit 2cfb221
into
react:mainOct 19, 2025

246 checks passed

@nextjs-botnextjs-bot
mentioned this pull request
Oct 20, 2025
 Merged

sebmarkbage pushed a commit
to vercel/next.js
that referenced
this pull request
Oct 20, 2025
@nextjs-bot
Upgrade React from58bdc0bb-20251019tof6a48828-20251019(#85081)
358e1a4
[diff
react/react@58bdc0bb...f6a48828](react/react@58bdc0b...f6a4882)
<details>
<summary>React upstream changes</summary>
- react/react#34918
- react/react#34916
- react/react#34912
</details>
@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
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@acdliteacdliteacdlite approved these changes
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@sebmarkbage@react-sizebot@acdlite