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Warn if calling setState outside of render but before commit #18838

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merged 2 commits into from May 6, 2020
Merged

Warn if calling setState outside of render but before commit #18838

merged 2 commits into from May 6, 2020

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sebmarkbage
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@sebmarkbage sebmarkbage commented May 6, 2020 •
edited

This indicates that there's a side-effect spawned during render, that then asynchronously tries to set state when the response comes back. E.g. kick off a request and then setState with the result. It's a common mistake when implementing Suspense.

This should be done in useEffect.

@facebook-github-bot facebook-github-bot added React Core Team Opened by a member of the React Core Team CLA Signed labels May 6, 2020
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codesandbox-ci bot commented May 6, 2020 •
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sizebot commented May 6, 2020 •
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Details of bundled changes.

Comparing: 33c3af2...2e018a9

react-dom

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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react-dom-unstable-fizz.browser.development.js 0.0% +0.1% 5.36 KB 5.36 KB 1.8 KB 1.81 KB UMD_DEV
ReactDOMTesting-dev.js +0.2% +0.1% 928.65 KB 930.9 KB 207.8 KB 208.11 KB FB_WWW_DEV
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react-dom.production.min.js 0.0% 0.0% 124.63 KB 124.63 KB 39.91 KB 39.91 KB UMD_PROD
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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Size changes (experimental)

Generated by 🚫 dangerJS against 2e018a9

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sizebot commented May 6, 2020 •
edited

Details of bundled changes.

Comparing: 33c3af2...2e018a9

react-native-renderer

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
ReactFabric-dev.js +0.4% +0.3% 638.96 KB 641.2 KB 137.19 KB 137.54 KB RN_OSS_DEV
ReactNativeRenderer-dev.js +0.3% +0.2% 657.92 KB 660.16 KB 141.75 KB 142.08 KB RN_OSS_DEV
ReactNativeRenderer-profiling.js 0.0% -0.0% 283.63 KB 283.63 KB 49.21 KB 49.21 KB RN_OSS_PROFILING
ReactFabric-prod.js 0.0% -0.0% 264.07 KB 264.07 KB 45.46 KB 45.46 KB RN_OSS_PROD

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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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react-test-renderer

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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react-reconciler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-reconciler.development.js +0.4% +0.3% 594.66 KB 596.76 KB 126.27 KB 126.64 KB NODE_DEV

ReactDOM: size: 0.0%, gzip: 0.0%

Size changes (stable)

Generated by 🚫 dangerJS against 2e018a9

@sebmarkbage
Don't attempt to render the children of a dehydrated Suspense boundary
69c0952 
The DehydratedFragment tag doesn't exist so doing so throws.

This can happen if we schedule childExpirationTime on the boundary and
bail out.
@sebmarkbage
Warn if scheduling work on a component before it is committed
2e018a9
@sebmarkbage sebmarkbage merged commit 96f3b7d into facebook:master May 6, 2020
@bbenezech bbenezech mentioned this pull request Jul 1, 2020
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@gaearon gaearon gaearon approved these changes

@ermanzohre ermanzohre ermanzohre approved these changes

@bvaughn bvaughn Awaiting requested review from bvaughn

@acdlite acdlite Awaiting requested review from acdlite

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