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[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

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@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 2026
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@eps1lon@react-sizebot@gnoff
, '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" + '
[Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

Conversation

@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 2026
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@eps1lon@react-sizebot@gnoff
, '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('^' + ".*" + ' [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

Conversation

@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 2026
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@eps1lon@react-sizebot@gnoff
, '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('^' + ".*" + ' [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

Conversation

@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 2026
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@eps1lon@react-sizebot@gnoff
, '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" + ' [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

Conversation

@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
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oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
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@eps1lon@react-sizebot@gnoff
, '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('^' + ".*" + ' [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

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@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 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'; } }); } 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('^' + ".*" + ' [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
Skip to content

[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

Merged
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
Merged

[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

Conversation

@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
@react-sizebot

react-sizebot commented Dec 2, 2025

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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
@eps1lon
eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
234 checks passed
@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
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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); } })(); })(); [Fizz] Push a stalled use() to the ownerStack/debugTask by eps1lon · Pull Request #35226 · react/react · GitHub
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[Fizz] Push a stalled use() to the ownerStack/debugTask - #35226

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eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort
Jan 19, 2026
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[Fizz] Push a stalled use() to the ownerStack/debugTask#35226
eps1lon merged 11 commits into
react:mainfrom
eps1lon:sebbie/fizz-thenable-abort

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@eps1lon

@eps1loneps1lon commented Nov 26, 2025

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Same as #33634 but for use and promise-as-a-child.

An alternative to re-rendering would've been to eagerly collect use() calls but we know Error() is slow in v8.

The danger with lazily collecting use() is that the Thenable may be resolved when we abort.
In those cases we remove instrumentation on the last thenable to ensure we suspend again. To ensure Thenable subclasses can't observe the corrupted state, we noop .then.

The shown stack relies on sourcemaps with ignoreList. Otherwise it'll point into React internals. From the dispatcher we wouldn't know how many stacks we have to cut without a circular dependency to the React.use function.

@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2eCompareNovember 29, 2025 15:57
@eps1lon
eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13CompareDecember 2, 2025 17:20
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Comparing: 3e1abcc...27f2043

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=607.92 kB607.60 kB=107.61 kB107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js=6.84 kB6.84 kB+0.16%1.88 kB1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js=667.15 kB666.83 kB=117.50 kB117.42 kB
facebook-www/ReactDOM-prod.classic.js=693.27 kB692.91 kB=122.00 kB121.92 kB
facebook-www/ReactDOM-prod.modern.js=683.65 kB683.34 kB=120.39 kB120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name+/-BaseCurrent+/- gzipBase gzipCurrent gzip
oss-stable-semver/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-stable/react-server/cjs/react-server.development.js+2.14%205.20 kB209.60 kB+2.22%36.17 kB36.97 kB
oss-experimental/react-server/cjs/react-server.development.js+2.09%209.99 kB214.39 kB+2.16%37.10 kB37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js+1.09%391.18 kB395.45 kB+1.07%71.05 kB71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.01 kB408.40 kB+1.14%73.07 kB73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.01 kB408.40 kB+1.13%73.07 kB73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js+1.09%404.03 kB408.43 kB+1.14%73.10 kB73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.09%404.03 kB408.43 kB+1.14%73.09 kB73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js+1.06%413.41 kB417.81 kB+1.09%74.02 kB74.83 kB
facebook-www/ReactDOMServer-dev.modern.js+1.06%414.90 kB419.30 kB+1.13%74.45 kB75.29 kB
facebook-www/ReactDOMServer-dev.classic.js+1.05%418.34 kB422.74 kB+1.12%75.05 kB75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js+1.05%419.32 kB423.72 kB+1.10%75.32 kB76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js+1.05%419.33 kB423.72 kB+1.10%75.32 kB76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.83 kB387.81 kB+1.11%72.76 kB73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js+1.04%383.90 kB387.88 kB+1.11%72.78 kB73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.35 kB437.75 kB+1.10%77.20 kB78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js+1.01%433.43 kB437.82 kB+1.11%77.24 kB78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.13 kB438.53 kB+1.13%77.37 kB78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js+1.01%434.21 kB438.60 kB+1.13%77.41 kB78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js+1.00%398.06 kB402.04 kB+1.11%75.07 kB75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js+1.00%440.39 kB444.79 kB+1.14%77.16 kB78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js+1.00%440.47 kB444.86 kB+1.15%77.21 kB78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js+0.98%449.71 kB454.11 kB+1.09%79.50 kB80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js+0.97%450.72 kB455.11 kB+1.09%79.73 kB80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js+0.96%456.48 kB460.87 kB+1.08%79.49 kB80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js+0.64%668.58 kB672.87 kB+0.68%118.34 kB119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon
eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53fCompareDecember 4, 2025 10:05
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eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89eCompareJanuary 12, 2026 20:41
Comment on lines +2814 to +2821
if (
request.status === ABORTING &&
// If we already started rendering the Lazy Componentn in an aborting state
// and reach this point, the lazy was already resolved.
// We don't bail here again since this is most likely a discarded rerender
// to get the stack where we suspended in dev.
(!__DEV__ || !previouslyAbortingDEV)
) {

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I think we should be more explicit about when we are in a stalled retry render rather than inferring too much. I wonder if multiple aborts could lead to this getting through here in dev when it wouldn't otherwise. You could make a new dev only status for the task that is checked instead

@eps1loneps1lonJan 14, 2026

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@eps1lon
eps1lonforce-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043CompareJanuary 14, 2026 10:21
@eps1lon
eps1lon requested a review from gnoffJanuary 14, 2026 10:33
@eps1lon
eps1lon merged commit 41b3e9a into react:mainJan 19, 2026
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@eps1lon
eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actionsBot pushed a commit that referenced this pull request Jan 19, 2026
lubieowoce added a commit to lubieowoce/react that referenced this pull request Jan 19, 2026
github-actionsBot pushed a commit to code/lib-react that referenced this pull request Jan 22, 2026
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@eps1lon@react-sizebot@gnoff