// Runs before every test file, and before setup.ts, whose imports load React:
// what jsdom leaves out that React looks for as it loads.

// Finding no AnimationEvent, React listens for the animation events under
// their old WebKit names, and `fireEvent.animationIteration` reaches no
// handler.
(globalThis as { AnimationEvent?: unknown }).AnimationEvent ??=
  class AnimationEvent extends Event {};