When you type your event handler functions in TypeScript, you give your code several key advantages. By specifying the event parameter type, such as MouseEvent for mouse clicks or KeyboardEvent for keyboard actions, TypeScript can check that you are only accessing valid properties and methods on the event object. This prevents common mistakes, like trying to access a property that does not exist on the event type. Additionally, modern code editors use these types to offer auto-completion and inline documentation, making it much easier to discover the available event properties and write correct code quickly. Typing event handlers leads to safer, more maintainable code and a smoother developer experience.