Function lineComment

Parse single-line comments:

const elm = lineComment("--");

const js = lineComment("//");

const python = lineComment("#");

This parser is defined like this:

const lineComment = (str: string): Parser<Unit> =>
  skip2nd<Unit>(symbol(str))(chompUntilEndOr("\n"));

So it will consume the remainder of the line. If the file ends before you see a newline, that is fine too.