Worked on the contentful-migration repository to enhance type safety during Contentful migrations by introducing a BuiltinEditor union type in TypeScript. This addition enumerated all valid builtin editor identifiers, enabling compile-time validation of widget IDs and preventing the use of invalid identifiers in migration scripts. The approach focused on leveraging TypeScript’s type definitions to reduce runtime errors and improve developer feedback. By strengthening the API development process with precise type checks, the work improved the maintainability and clarity of the migration tooling. No bugs were fixed during this period, with efforts concentrated on delivering this targeted feature enhancement.