Unit tests and types don't have as much overlap as anti-type people claim. You need both, and you shouldn't write tests for most of what type errors cover. Typ

Unit tests and types don't have as much overlap as anti-type people claim. You need both, and you shouldn't write tests for most of what type errors cover. TypeScript transpilation is easy and fast. You can emit JS even when there are type errors, and use tsc as just a type-checker while using esbuild to strip types from JS. Performance is not an issue in practice and the benefits are pretty far reaching.