[kiliancs]

I don't love the compile times, but I'll also say with TypeScript I tend to check the browser that often. TS also means simpler refactoring, for example.

Note also: * type checks can run in parallel, so they won't block your other build block * the tsc has been making gradual improvements to performance and techniques to improve compilation and type checking * there are speedy alternatives to the TypeScript compiler (tsc) (eg: https://sucrase.io) for transpilation