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Defer useDeferredValue updates in Gestures - #35511

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Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
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sebmarkbage:gesturedeferredvalue

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If an initial value is specified, then it's always used regardless as part of the gesture render.

If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.

The effect is that useDeferredValue renders the previous state.

@github-actionsgithub-actionsBot added the React Core Team Opened by a member of the React Core Team label Jan 14, 2026
@sebmarkbage

sebmarkbage commented Jan 14, 2026

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I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.

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Comparing: 4a3d993...9ab381c

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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 9ab381c

@sebmarkbage
sebmarkbage merged commit eac3c95 into react:mainJan 16, 2026
240 checks passed
github-actionsBot pushed a commit that referenced this pull request Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot mentioned this pull request Jan 16, 2026
Merged
@rubennorterubennorte mentioned this pull request Jun 5, 2026
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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" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
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Defer useDeferredValue updates in Gestures - #35511
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sebmarkbage merged 1 commit into
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sebmarkbage:gesturedeferredvalue
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Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
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sebmarkbage:gesturedeferredvalue
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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
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I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
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@rubennorterubennorte
mentioned this pull request
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, '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('^' + ".*" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
Skip to content
Defer useDeferredValue updates in Gestures - #35511
Merged
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Jan 16, 2026
Merged
Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Jan 14, 2026

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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
added
the 
React Core Team
Opened by a member of the React Core Team
label
Jan 14, 2026
@sebmarkbage
sebmarkbage
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Jan 14, 2026

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ContributorAuthor
I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
react-sizebot
commented
Jan 14, 2026

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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
 Merged

@rubennorterubennorte
mentioned this pull request
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@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('^' + ".*" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
Skip to content
Defer useDeferredValue updates in Gestures - #35511
Merged
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Jan 16, 2026
Merged
Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
added
the 
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Jan 14, 2026
@sebmarkbage
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Jan 14, 2026

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ContributorAuthor
I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
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commented
Jan 14, 2026

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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
 Merged

@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
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@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" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
Skip to content
Defer useDeferredValue updates in Gestures - #35511
Merged
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Jan 16, 2026
Merged
Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Conversation
@sebmarkbage
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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
added
the 
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Opened by a member of the React Core Team
label
Jan 14, 2026
@sebmarkbage
sebmarkbage
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Jan 14, 2026

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ContributorAuthor
I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
react-sizebot
commented
Jan 14, 2026

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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
 Merged

@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
 Closed

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3 participants

@sebmarkbage@react-sizebot@acdlite

, '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('^' + ".*" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
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Defer useDeferredValue updates in Gestures - #35511
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sebmarkbage merged 1 commit into
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sebmarkbage:gesturedeferredvalue
Jan 16, 2026
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Defer useDeferredValue updates in Gestures#35511
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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
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I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

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@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
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@rubennorterubennorte
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Jun 5, 2026
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, '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';
}
});
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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('^' + ".*" + '
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
Skip to content
Defer useDeferredValue updates in Gestures - #35511
Merged
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Jan 16, 2026
Merged
Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
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Jan 14, 2026

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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
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@sebmarkbage
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I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
 Merged

@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
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, '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); }
})();
})();
Defer useDeferredValue updates in Gestures by sebmarkbage · Pull Request #35511 · react/react · GitHub
Skip to content
Defer useDeferredValue updates in Gestures - #35511
Merged
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Jan 16, 2026
Merged
Defer useDeferredValue updates in Gestures#35511
sebmarkbage merged 1 commit into
react:mainfrom 
sebmarkbage:gesturedeferredvalue
Conversation
@sebmarkbage
@sebmarkbagesebmarkbage
commented
Jan 14, 2026

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If an initial value is specified, then it's always used regardless as part of the gesture render.
If a gesture render causes an update, then previously that was not treated as deferred and could therefore be blocking the render. However, a gesture is supposed to flush synchronously ideally. Therefore we should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
@github-actionsgithub-actionsBot
added
the 
React Core Team
Opened by a member of the React Core Team
label
Jan 14, 2026
@sebmarkbage
sebmarkbage
commented
Jan 14, 2026

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ContributorAuthor
I'm not actually sure this is better because the "previous" state is kind of arbitrary in these simulated environments. If you did an actual Transition at the end then that would not include this deferred value and you'd typically not see this state for those. But I think in the case where something is structured in such a way that you do have a shared deferred value that updates it probably makes sense to treat that similar to if you did a sync navigation since that's effective what the gesture has to be.
@react-sizebot
react-sizebot
commented
Jan 14, 2026

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Comparing: 4a3d993...9ab381c
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+0.11%1.88 kB1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js=608.03 kB607.61 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.05%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.26 kB666.83 kB=117.51 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.38 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.76 kB683.34 kB=120.40 kB120.31 kB
Significant size changes
Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 9ab381c
@sebmarkbage
sebmarkbage
merged commit eac3c95
into
react:mainJan 16, 2026

240 checks passed

github-actionsBot
pushed a commit
that referenced
this pull request
Jan 16, 2026
@sebmarkbage
Defer useDeferredValue updates in Gestures (#35511)
3557c49
If an initial value is specified, then it's always used regardless as
part of the gesture render.
If a gesture render causes an update, then previously that was not
treated as deferred and could therefore be blocking the render. However,
a gesture is supposed to flush synchronously ideally. Therefore we
should consider these as urgent.
The effect is that useDeferredValue renders the previous state.
DiffTrain build for [eac3c95](eac3c95)
@nextjs-botnextjs-bot
mentioned this pull request
Jan 16, 2026
 Merged

@rubennorterubennorte
mentioned this pull request
Jun 5, 2026
 Closed

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@sebmarkbage@react-sizebot@acdlite