Javascript tooling has evolved a lot and we have a huge list of javascript bundlers / transpilers today. Most of these are built using javascript which is better in most cases, but as we build more complex apps, relying only on javascript for bundling and transpiling won't be ideal. This is where languages like Rust comes in. Rust is a memory-efficient low level programming language which can be used for building systems which makes it a best choice for writing tools for javascript. Check out my article to know more about rust and how it can be used with javascript,

https://akshaykannan.tech/blog/rust-javascript