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Fix race condition when performing swap for fallback #7945

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merged 3 commits into from
Aug 4, 2023
Merged

Fix race condition when performing swap for fallback #7945

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aadf761
Fix race condition when performing swap for fallback
matthewp Aug 3, 2023
1c754aa
Adding a changeset
matthewp Aug 4, 2023
2a6a23a
Use let
matthewp Aug 4, 2023
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5 changes: 5 additions & 0 deletions .changeset/cold-maps-report.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'astro': patch
---

Fix race condition when performing swap for fallback
11 changes: 8 additions & 3 deletions packages/astro/components/ViewTransitions.astro
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Original file line number Diff line number Diff line change
Expand Up @@ -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();
}
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