Typescript developer here. While I welcome the proposal, it’s delusional to suggest that this will ever come close to supplanting Typescript in the foreseeable future. There are already tools like esbuild runner which remove the pain around messing with a tsconfig file, assuming reasonable defaults are present. This is a long haul and the day it will make a typescript dev take notice is when it can outright replace it, and be fully compatible with the existing type definitions supplied with JS libraries out there. Until then this is a poor man’s Typescript, if you’re going to bother with adding types to your JS you can be bothered to install the tooling to allow for it.