You'd already be using source maps in any real-world scenario so I am not sure what's the value proposition here outside of "just for fun, I guess".<p>The tsc transpilation to lower ES versions is actually really useful when using not-so-recent Node versions. Not to mention this severely restricts TypeScript syntax to "just types" which isn't too bad but it means you now have to worry about yet another thing.<p>Then there's the ESM & CJS mess. You almost always want to export in both formats which will change a lot of the syntax, so this quickly falls apart for anything serious.<p>Just use esbuild if you want speed.