There's plenty of other POSIX userlands for Windows before WSL (cygwin, Ming). There are also plenty of other cross platform programming environments before Gr

There's plenty of other POSIX userlands for Windows before WSL (cygwin, Ming). There are also plenty of other cross platform programming environments before Grunt (Perl, Python, Ruby, Lua, Haskell, numerous lisps, etc). JavaScript isn't unique. It's not even the best at what it does. It just has a monopoly in the browser so people latched on to it.