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fix(ui): polyfill animation frames in tests #3930

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Merged
trunk-io merged 2 commits into from
Jul 29, 2026
Merged

fix(ui): polyfill animation frames in tests #3930

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fix(ui): polyfill animation frames in tests
tatoalo Jul 29, 2026
51f4815
Merge branch 'main' into posthog-code/fix-ui-request-animation-frame-…
tatoalo Jul 29, 2026
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9 changes: 9 additions & 0 deletions packages/ui/src/test/setup.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,15 @@ if (typeof globalThis.ResizeObserver === "undefined") {
ResizeObserverStub as unknown as typeof ResizeObserver;
}

// jsdom does not implement animation frames. Components backed by browser
// animation libraries can schedule a frame from a delayed callback, turning an
// otherwise passing test into an unhandled ReferenceError later in the suite.
if (typeof globalThis.requestAnimationFrame === "undefined") {
globalThis.requestAnimationFrame = (callback: FrameRequestCallback) =>
setTimeout(() => callback(performance.now()), 0) as unknown as number;
globalThis.cancelAnimationFrame = (handle: number) => clearTimeout(handle);
}

// jsdom does not implement Element.getAnimations. With ResizeObserver stubbed
// above, Base UI's ScrollAreaViewport now mounts fully and schedules a timer
// that calls viewport.getAnimations() — which would otherwise throw an
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