Fix Flow types of useEffectEvent #26468

eps1lon · 2023-03-24T15:46:35Z

Summary

Just copied the types over from the internal types. Type error was hidden by overly broad FlowFixMe. With $FlowFixMe[not-a-function] we would've seen the actual issue:

Cannot return `dispatcher.useEffectEvent(...)` because  `T` [1] is incompatible with  undefined [2].Flow(incompatible-return)

How did you test this change?

yarn flow dom-node
CI

eps1lon · 2023-03-24T15:47:54Z

packages/react/src/ReactHooks.js

@@ -234,8 +234,10 @@ export function useMemoCache(size: number): Array<any> {
  return dispatcher.useMemoCache(size);
 }

-export function useEffectEvent<T>(callback: T): void {
+export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(


@kassens Do we actually need the Args and Return type parameter here? In TS we can just do useEffectEvent<T extends Function>. Does something similar exist in Flow?

react-sizebot · 2023-03-24T15:51:56Z

Comparing: 9c54b29...f932f34

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.min.js	=	159.33 kB	159.33 kB	=	50.47 kB	50.47 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	161.07 kB	161.07 kB	=	50.98 kB	50.99 kB
facebook-www/ReactDOM-prod.classic.js	=	546.16 kB	546.16 kB	=	96.84 kB	96.84 kB
facebook-www/ReactDOM-prod.modern.js	=	529.86 kB	529.86 kB	=	94.38 kB	94.38 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against f932f34

kassens

Nice, we should probably try to replace all the generic suppressions with specific ones to avoid shadowing new errors of different kinds.

kassens · 2023-03-25T16:33:59Z

packages/react/src/ReactHooks.js

  return dispatcher.useMemoCache(size);
 }

-export function useEffectEvent<T>(callback: T): void {
+export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(


This is a little bit shorter, we don't have to define the return type in the type constraint for F:

Suggested change

export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(

export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(

export function useEffectEvent<Args, F: (...Args) => mixed>(

Applied in facebook/react@9cf21fb (#26468) to make it consistent with the internal types.

## Summary Just copied the types over from the internal types. Type error was hidden by overly broad FlowFixMe. With `$FlowFixMe[not-a-function]` we would've seen the actual issue: ``` Cannot return `dispatcher.useEffectEvent(...)` because `T` [1] is incompatible with undefined [2].Flow(incompatible-return) ``` ## How did you test this change? - [x] yarn flow dom-node - [x] CI DiffTrain build for [d12bdcd](d12bdcd)

Summary: This sync includes the following changes: - **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([#26489](facebook/react#26489)) //<Ricky>// - **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([#26524](facebook/react#26524)) //<Sebastian Markbåge>// - **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([#26474](facebook/react#26474)) //<dan>// - **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([#26523](facebook/react#26523)) //<Sebastian Markbåge>// - **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([#26513](facebook/react#26513)) //<Sebastian Markbåge>// - **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([#26511](facebook/react#26511)) //<Andrew Clark>// - **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([#26510](facebook/react#26510)) //<Joseph Savona>// - **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([#26514](facebook/react#26514)) //<Sebastian Markbåge>// - **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([#26507](facebook/react#26507)) //<Sebastian Markbåge>// - **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([#26509](facebook/react#26509)) //<Andrew Clark>// - **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([#26508](facebook/react#26508)) //<Andrew Clark>// - **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([#26478](facebook/react#26478)) //<Sebastian Silbermann>// - **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([#26479](facebook/react#26479)) //<Sebastian Silbermann>// - **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([#26501](facebook/react#26501)) //<Sebastian Markbåge>// - **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([#26498](facebook/react#26498)) //<Andrew Clark>// - **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([#26497](facebook/react#26497)) //<Ricky>// - **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([#26490](facebook/react#26490)) //<Ricky>// - **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([#26494](facebook/react#26494)) //<Andrew Clark>// - **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([#26493](facebook/react#26493)) //<Andrew Clark>// - **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([#26491](facebook/react#26491)) //<Andrew Clark>// - **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([#26488](facebook/react#26488)) //<Jan Kassens>// - **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([#26487](facebook/react#26487)) //<Jan Kassens>// - **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([#26434](facebook/react#26434)) //<Andrew Clark>// - **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([#26468](facebook/react#26468)) //<Sebastian Silbermann>// - **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([#26450](facebook/react#26450)) //<Josh Story>// - **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([#26473](facebook/react#26473)) //<dan>// - **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([#26442](facebook/react#26442)) //<Mark Erikson>// - **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([#26437](facebook/react#26437)) //<Rubén Norte>// - **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([#26395](facebook/react#26395)) //<Ricky>// - **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([#26453](facebook/react#26453)) //<Andrew Clark>// - **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([#26457](facebook/react#26457)) //<Sebastian Markbåge>// - **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([#26461](facebook/react#26461)) //<Rubén Norte>// - **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([#26458](facebook/react#26458)) //<Sebastian Markbåge>// - **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([#26455](facebook/react#26455)) //<Leedom>// - **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([#26452](facebook/react#26452)) //<Valor(华洛)>// - **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component ([#26380](facebook/react#26380)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 77ba161...ca01f35 jest_e2e[run_all_tests] bypass-github-export-checks Reviewed By: sammy-SC Differential Revision: D44669450 fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437

Summary: This sync includes the following changes: - **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([facebook#26489](facebook/react#26489)) //<Ricky>// - **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([facebook#26524](facebook/react#26524)) //<Sebastian Markbåge>// - **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([facebook#26474](facebook/react#26474)) //<dan>// - **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([facebook#26523](facebook/react#26523)) //<Sebastian Markbåge>// - **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([facebook#26513](facebook/react#26513)) //<Sebastian Markbåge>// - **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([facebook#26511](facebook/react#26511)) //<Andrew Clark>// - **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([facebook#26510](facebook/react#26510)) //<Joseph Savona>// - **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([facebook#26514](facebook/react#26514)) //<Sebastian Markbåge>// - **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([facebook#26507](facebook/react#26507)) //<Sebastian Markbåge>// - **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([facebook#26509](facebook/react#26509)) //<Andrew Clark>// - **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([facebook#26508](facebook/react#26508)) //<Andrew Clark>// - **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([facebook#26478](facebook/react#26478)) //<Sebastian Silbermann>// - **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([facebook#26479](facebook/react#26479)) //<Sebastian Silbermann>// - **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([facebook#26501](facebook/react#26501)) //<Sebastian Markbåge>// - **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([facebook#26498](facebook/react#26498)) //<Andrew Clark>// - **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([facebook#26497](facebook/react#26497)) //<Ricky>// - **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([facebook#26490](facebook/react#26490)) //<Ricky>// - **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([facebook#26494](facebook/react#26494)) //<Andrew Clark>// - **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([facebook#26493](facebook/react#26493)) //<Andrew Clark>// - **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([facebook#26491](facebook/react#26491)) //<Andrew Clark>// - **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([facebook#26488](facebook/react#26488)) //<Jan Kassens>// - **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([facebook#26487](facebook/react#26487)) //<Jan Kassens>// - **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([facebook#26434](facebook/react#26434)) //<Andrew Clark>// - **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([facebook#26468](facebook/react#26468)) //<Sebastian Silbermann>// - **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([facebook#26450](facebook/react#26450)) //<Josh Story>// - **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([facebook#26473](facebook/react#26473)) //<dan>// - **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([facebook#26442](facebook/react#26442)) //<Mark Erikson>// - **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([facebook#26437](facebook/react#26437)) //<Rubén Norte>// - **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([facebook#26395](facebook/react#26395)) //<Ricky>// - **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([facebook#26453](facebook/react#26453)) //<Andrew Clark>// - **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([facebook#26457](facebook/react#26457)) //<Sebastian Markbåge>// - **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([facebook#26461](facebook/react#26461)) //<Rubén Norte>// - **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([facebook#26458](facebook/react#26458)) //<Sebastian Markbåge>// - **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([facebook#26455](facebook/react#26455)) //<Leedom>// - **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([facebook#26452](facebook/react#26452)) //<Valor(华洛)>// - **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component ([facebook#26380](facebook/react#26380)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 77ba161...ca01f35 jest_e2e[run_all_tests] bypass-github-export-checks Reviewed By: sammy-SC Differential Revision: D44669450 fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437

## Summary Just copied the types over from the internal types. Type error was hidden by overly broad FlowFixMe. With `$FlowFixMe[not-a-function]` we would've seen the actual issue: ``` Cannot return `dispatcher.useEffectEvent(...)` because `T` [1] is incompatible with undefined [2].Flow(incompatible-return) ``` ## How did you test this change? - [x] yarn flow dom-node - [x] CI DiffTrain build for commit d12bdcd.

eps1lon added 2 commits March 24, 2023 16:45

useEffectEvent: Highlight wrong types

e7592de

Fix Flow types of useEffectEvent

d849cbc

facebook-github-bot added the CLA Signed label Mar 24, 2023

eps1lon requested a review from kassens March 24, 2023 15:46

facebook-github-bot added the React Core Team Opened by a member of the React Core Team label Mar 24, 2023

eps1lon commented Mar 24, 2023

View reviewed changes

Narrow down FlowFixMe for other hooks as well

048d91b

kassens approved these changes Mar 25, 2023

View reviewed changes

Simplify useEffectEvent types

f932f34

eps1lon force-pushed the fix/useEffectEventTypes branch from 9cf21fb to f932f34 Compare March 25, 2023 17:55

eps1lon merged commit d12bdcd into facebook:main Mar 25, 2023

eps1lon deleted the fix/useEffectEventTypes branch March 25, 2023 20:06

sammy-SC mentioned this pull request Apr 5, 2023

Use native scheduler if defined sammy-SC/react#1

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Fix Flow types of useEffectEvent #26468

Fix Flow types of useEffectEvent #26468

eps1lon commented Mar 24, 2023 •

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eps1lon Mar 24, 2023

react-sizebot commented Mar 24, 2023 •

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kassens Mar 25, 2023

eps1lon Mar 25, 2023

	export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(
	export function useEffectEvent<Args, Return, F: (...Array<Args>) => Return>(
	export function useEffectEvent<Args, F: (...Args) => mixed>(

Fix Flow types of useEffectEvent #26468

Fix Flow types of useEffectEvent #26468

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eps1lon commented Mar 24, 2023 • edited Loading

Summary

How did you test this change?

eps1lon Mar 24, 2023

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react-sizebot commented Mar 24, 2023 • edited Loading

Critical size changes

Significant size changes

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eps1lon commented Mar 24, 2023 •

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