Python and Rust have such a thing, but not e.g. Java, Go, C#. And I can't find any libraries on npm which do this. That seems like a very niche need, not actual

Python and Rust have such a thing, but not e.g. Java, Go, C#. And I can't find any libraries on npm which do this. That seems like a very niche need, not actually the sort of thing whose absence causes people to have lots of npm dependencies.