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Fix state leaking when a function component throws on server render #19212

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merged 6 commits into from
Jul 8, 2020

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pmaccart
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Summary

Reset the internal hooks state when preparing a component for hooks usage, rather than after a component finishes rendering. This fixes #19211, where the internal hooks state is not cleared if a function component throws an error while rendering.

Test Plan

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sizebot commented Jun 30, 2020

No significant bundle size changes to report.

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Generated by 🚫 dangerJS against 21fdac0

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sizebot commented Jun 30, 2020

No significant bundle size changes to report.

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Generated by 🚫 dangerJS against 21fdac0

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gaearon commented Jun 30, 2020

Can you add a test that would have been failing before? That would make it easier to check the changes.

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gaearon commented Jun 30, 2020

Can we instead add resetHooksAfterThrow, mirroring what we do in ReactFiberHooks?

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@pmaccart pmaccart force-pushed the reset-hooks-state-before-render branch 6 times, most recently from 6dad98b to 46556a4 Compare July 7, 2020 16:11
@pmaccart pmaccart force-pushed the reset-hooks-state-before-render branch from 46556a4 to 398116c Compare July 7, 2020 16:23
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pmaccart commented Jul 7, 2020

@gaearon Thanks for the feedback, and sorry for the slow response.

I made a couple updates to the PR:

  1. Added a unit test that fails prior to the fix (64f35a1)
  2. Added a commit that implements a similar approach to what is taken in ReactFiberHooks -- eager to get your feedback on whether this approach is preferable, or whether we want to stick with resetting the state in the prepareToUseHooks function. Happy to go either way on this.

if (__DEV__) {
isInHookUserCodeInDev = false;
}

// These were reset above
// These were reset via the resetHooksState() call
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Let's just remove this comment?

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Done.

numberOfReRenders = 0;
renderPhaseUpdates = null;
workInProgressHook = null;
resetHooksState();
if (__DEV__) {
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Move this DEV-only block to reset too?

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Done.

@gaearon gaearon changed the title Reset internal hooks state before rendering Fix state leaking when a function component throws on server render Jul 8, 2020
@@ -202,24 +202,21 @@ export function finishHooks(

children = Component(props, refOrContext);
}
currentlyRenderingComponent = null;
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Did we lose currentlyRenderingComponent?

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Oops, yes -- added that in as well.

@gaearon gaearon merged commit b85b476 into facebook:master Jul 8, 2020
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gaearon commented Jul 8, 2020

Looks good. Thx

trueadm pushed a commit to trueadm/react that referenced this pull request Jul 8, 2020
…acebook#19212)

* add unit test asserting internal hooks state is reset

* Reset internal hooks state before rendering

* reset hooks state on error

* Use expect...toThrow instead of try/catch in test

* reset dev-only hooks state inside resetHooksState

* reset currentlyRenderingComponent to null
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Bug: React hook state not cleared when rendering using ReactDOMServer if component errors
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