Thorgalle enhanced event typing in the sveltejs/svelte repository by refining how custom events without detail are represented in Svelte 4. Focusing on frontend development with Svelte and TypeScript, Thorgalle updated the event dispatcher so that events lacking a detail argument are now typed as null rather than never, improving type safety and reducing ambiguity for developers. This change helps catch type mismatches earlier in the TypeScript workflow and clarifies the API surface for event handling. Thorgalle also updated documentation to reflect these adjustments, ensuring guidance remains accurate. The work maintained API compatibility while deepening TypeScript integration and developer experience.