I am having problem with mingw64 console.
When I execute artisan commands from mingw64 console each output line is prefixed and sufixed with "←[39m":
Any idea how to fix it?
Those are ANSI color codes. It's not a problem with Laravel or Artisan.
With a shell that properly supports them, it'll look like this:
I'm not aware of any way to turn them off in Artisan, so your likely options are a) put up with it or b) use a better shell. Cygwin might be an option.