They don't keep parity. As far as I know, the official TypeScript implementation is the only major one that performs checking. There are tons of other options f

They don't keep parity. As far as I know, the official TypeScript implementation is the only major one that performs checking. There are tons of other options for stripping types that are much faster, but that's a much easier task Deno uses tsc internally, and VSCode at least uses the official typescript language server, which I believe uses tsc internally