Worked on the sveltejs/svelte repository to improve the reliability of animation transitions in the front end codebase. Addressed a bug in Svelte’s JavaScript animation logic that previously caused transition events to be dispatched incorrectly during animations. Refactored the event flow by moving event dispatch logic out of the animation handler and introducing a dedicated callback, ensuring that transition events are only emitted at appropriate times. Enhanced maintainability by clarifying the separation of concerns within the transitions module. Added unit tests to prevent regressions, resulting in more predictable event handling and improved performance for end users interacting with animated components.