I have this:

process.stdin.setRawMode(true);

but I cannot use it like so:

process.stdin.setRawMode(true).on('data' fn);

just curious if that is true and why that is. It could just be that the TypeScript typings are wrong.
Anyway, I would expect that process.stdin.setRawMode() would return the same thing as process.stdin.setEncoding().