Life after TypeScript

Motion's engineering team shares their decision to migrate from TypeScript to C# after 5 years and 2.5 million lines of code. The move addresses persistent developer experience issues including slow TypeScript compilation, language server crashes, ORM limitations with Prisma/Drizzle, and React Native performance bottlenecks. While acknowledging TypeScript's strengths in enabling full-stack development and rapid iteration, the team chose C# for its mature ecosystem, Entity Framework's robust ORM capabilities, similarity to TypeScript syntax, and better AI code generation performance. The article emphasizes this isn't about runtime performance but rather codebase scaling and developer productivity at enterprise scale.