The JS `tsc` type checks the entire 1.5 million line VS Code source in 77s (non-incremental). 7s is a lot better and will certainly imrpove DX - which is their goal - but I don't see how that's "insufficient".
The trade-off is that the team will have to start dealing with a lot of separate issues... How do tools like ESLint TS talk to TSC now? How to run this in playground? How to distribute the binaries? And they also lose out on the TS type system, which makes their Go version rely a little more on developer prowess.
This is an easy choice for one of the most fundamental tools underlaying a whole ecosystem, maintained by Microsoft and one of the developers of C# itself, full-time.
Other businesses probably want to focus on actually making money by leading their domain and easing long-term maintenance.
The trade-off is that the team will have to start dealing with a lot of separate issues... How do tools like ESLint TS talk to TSC now? How to run this in playground? How to distribute the binaries? And they also lose out on the TS type system, which makes their Go version rely a little more on developer prowess.
This is an easy choice for one of the most fundamental tools underlaying a whole ecosystem, maintained by Microsoft and one of the developers of C# itself, full-time.
Other businesses probably want to focus on actually making money by leading their domain and easing long-term maintenance.