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Fix race condition when performing swap for fallback (#7945)

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* Fix race condition when performing swap for fallback

* Adding a changeset

* Use let
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Matthew Phillips 2023-08-04 08:48:11 -04:00 committed by GitHub
parent 9b1de49075
commit a00cfb8942
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2 changed files with 13 additions and 3 deletions
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5
.changeset/cold-maps-report.md Normal file
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@ -0,0 +1,5 @@
---
'astro': patch
---
Fix race condition when performing swap for fallback

11
packages/astro/components/ViewTransitions.astro
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@ -168,13 +168,18 @@ const { fallback = 'animate' } = Astro.props as Props;
// Trigger the animations
document.documentElement.dataset.astroTransitionFallback = 'old';
doc.documentElement.dataset.astroTransitionFallback = 'new';
const fallbackSwap = () => {
removeEventListener('animationend', fallbackSwap);
clearTimeout(timeout);
swap();
document.documentElement.dataset.astroTransitionFallback = 'new';
};
// If there are any animations, want for the animationend event.
addEventListener('animationend', swap, { once: true });
addEventListener('animationend', fallbackSwap, { once: true });
// If there are no animations, go ahead and swap on next tick
// This is necessary because we do not know if there are animations.
// The setTimeout is a fallback in case there are none.
setTimeout(() => !isAnimating && swap());
let timeout = setTimeout(() => !isAnimating && fallbackSwap());
} else {
swap();
}