Typescript is a great project but I feel it’s fast outgrowing the JavaScript it’s written in, similar to when Sass outgrew Ruby and needed to be rewritten in C.

Projects are getting larger and more complex and tsc is often becoming the bottleneck performance wise: usually waiting for typechecking to finish, having your fans spinning in the background, type-stripping during development then type checking on CI. The performance needs from users seem to be outpacing what tsc can provide.

Something has to give, it would have been nice to see Microsoft create an official Rust implementation but i feel we’ll get one whether it’s from them or not.