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@eps1lon eps1lon commented Nov 26, 2025

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.

@meta-cla meta-cla bot added the CLA Signed label Nov 26, 2025
@eps1lon eps1lon force-pushed the sebbie/fizz-thenable-abort branch 4 times, most recently from b2a0edf to 7c6ae2e Compare November 29, 2025 15:57
@eps1lon eps1lon requested review from gnoff and unstubbable November 29, 2025 16:03
@eps1lon eps1lon marked this pull request as ready for review November 29, 2025 16:04
@eps1lon eps1lon force-pushed the sebbie/fizz-thenable-abort branch 3 times, most recently from c364caf to b617d13 Compare December 2, 2025 17:20
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react-sizebot commented Dec 2, 2025

Comparing: 3e1abcc...27f2043

Critical size changes

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

Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable/react-dom/cjs/react-dom.production.js = 6.84 kB 6.84 kB +0.11% 1.88 kB 1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js = 607.92 kB 607.60 kB = 107.61 kB 107.53 kB
oss-experimental/react-dom/cjs/react-dom.production.js = 6.84 kB 6.84 kB +0.16% 1.88 kB 1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js = 667.15 kB 666.83 kB = 117.50 kB 117.42 kB
facebook-www/ReactDOM-prod.classic.js = 693.27 kB 692.91 kB = 122.00 kB 121.92 kB
facebook-www/ReactDOM-prod.modern.js = 683.65 kB 683.34 kB = 120.39 kB 120.31 kB
oss-stable-semver/react-server/cjs/react-server.development.js +2.14% 205.20 kB 209.60 kB +2.22% 36.17 kB 36.97 kB
oss-stable/react-server/cjs/react-server.development.js +2.14% 205.20 kB 209.60 kB +2.22% 36.17 kB 36.97 kB
oss-experimental/react-server/cjs/react-server.development.js +2.09% 209.99 kB 214.39 kB +2.16% 37.10 kB 37.90 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable-semver/react-server/cjs/react-server.development.js +2.14% 205.20 kB 209.60 kB +2.22% 36.17 kB 36.97 kB
oss-stable/react-server/cjs/react-server.development.js +2.14% 205.20 kB 209.60 kB +2.22% 36.17 kB 36.97 kB
oss-experimental/react-server/cjs/react-server.development.js +2.09% 209.99 kB 214.39 kB +2.16% 37.10 kB 37.90 kB
oss-experimental/react-markup/cjs/react-markup.development.js +1.09% 391.18 kB 395.45 kB +1.07% 71.05 kB 71.81 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.node.development.js +1.09% 404.01 kB 408.40 kB +1.14% 73.07 kB 73.90 kB
oss-stable-semver/react-dom/cjs/react-dom-server-legacy.browser.development.js +1.09% 404.01 kB 408.40 kB +1.13% 73.07 kB 73.90 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.node.development.js +1.09% 404.03 kB 408.43 kB +1.14% 73.10 kB 73.93 kB
oss-stable/react-dom/cjs/react-dom-server-legacy.browser.development.js +1.09% 404.03 kB 408.43 kB +1.14% 73.09 kB 73.93 kB
facebook-www/ReactDOMServerStreaming-dev.modern.js +1.06% 413.41 kB 417.81 kB +1.09% 74.02 kB 74.83 kB
facebook-www/ReactDOMServer-dev.modern.js +1.06% 414.90 kB 419.30 kB +1.13% 74.45 kB 75.29 kB
facebook-www/ReactDOMServer-dev.classic.js +1.05% 418.34 kB 422.74 kB +1.12% 75.05 kB 75.89 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.node.development.js +1.05% 419.32 kB 423.72 kB +1.10% 75.32 kB 76.15 kB
oss-experimental/react-dom/cjs/react-dom-server-legacy.browser.development.js +1.05% 419.33 kB 423.72 kB +1.10% 75.32 kB 76.14 kB
oss-stable-semver/react-dom/cjs/react-dom-server.bun.development.js +1.04% 383.83 kB 387.81 kB +1.11% 72.76 kB 73.56 kB
oss-stable/react-dom/cjs/react-dom-server.bun.development.js +1.04% 383.90 kB 387.88 kB +1.11% 72.78 kB 73.59 kB
oss-stable-semver/react-dom/cjs/react-dom-server.browser.development.js +1.01% 433.35 kB 437.75 kB +1.10% 77.20 kB 78.05 kB
oss-stable/react-dom/cjs/react-dom-server.browser.development.js +1.01% 433.43 kB 437.82 kB +1.11% 77.24 kB 78.10 kB
oss-stable-semver/react-dom/cjs/react-dom-server.edge.development.js +1.01% 434.13 kB 438.53 kB +1.13% 77.37 kB 78.24 kB
oss-stable/react-dom/cjs/react-dom-server.edge.development.js +1.01% 434.21 kB 438.60 kB +1.13% 77.41 kB 78.29 kB
oss-experimental/react-dom/cjs/react-dom-server.bun.development.js +1.00% 398.06 kB 402.04 kB +1.11% 75.07 kB 75.91 kB
oss-stable-semver/react-dom/cjs/react-dom-server.node.development.js +1.00% 440.39 kB 444.79 kB +1.14% 77.16 kB 78.04 kB
oss-stable/react-dom/cjs/react-dom-server.node.development.js +1.00% 440.47 kB 444.86 kB +1.15% 77.21 kB 78.09 kB
oss-experimental/react-dom/cjs/react-dom-server.browser.development.js +0.98% 449.71 kB 454.11 kB +1.09% 79.50 kB 80.37 kB
oss-experimental/react-dom/cjs/react-dom-server.edge.development.js +0.97% 450.72 kB 455.11 kB +1.09% 79.73 kB 80.59 kB
oss-experimental/react-dom/cjs/react-dom-server.node.development.js +0.96% 456.48 kB 460.87 kB +1.08% 79.49 kB 80.35 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js +0.64% 668.58 kB 672.87 kB +0.68% 118.34 kB 119.15 kB

Generated by 🚫 dangerJS against 27f2043

@eps1lon eps1lon marked this pull request as draft December 4, 2025 06:56
@eps1lon eps1lon force-pushed the sebbie/fizz-thenable-abort branch 5 times, most recently from 22689b0 to 3c7b53f Compare December 4, 2025 10:05
@eps1lon eps1lon marked this pull request as ready for review December 4, 2025 10:09
@eps1lon eps1lon force-pushed the sebbie/fizz-thenable-abort branch from 3c7b53f to cbfb89e Compare January 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

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@eps1lon eps1lon Jan 14, 2026

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@eps1lon eps1lon force-pushed the sebbie/fizz-thenable-abort branch from 6c79426 to 27f2043 Compare January 14, 2026 10:21
@eps1lon eps1lon requested a review from gnoff January 14, 2026 10:33
@eps1lon eps1lon merged commit 41b3e9a into facebook:main Jan 19, 2026
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@eps1lon eps1lon deleted the sebbie/fizz-thenable-abort branch January 19, 2026 08:10
github-actions bot 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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