Worked on the SpareBank1/designsystem repository to enhance the stability and reliability of its Dropdown component. Addressed a specific issue where the onOpen and onClose callbacks were triggered during the component’s initial mount, rather than only when the expanded state changed. By refining the callback logic using JavaScript, React, and TypeScript, ensured that these callbacks now fire exclusively in response to actual state transitions after the initial render. This targeted bug fix reduces unintended side effects for consuming applications and simplifies integration for downstream developers. The work focused on delivering a minimal, well-scoped change that improves maintainability and testing outcomes.