A way to use but without instantiation

File-Homedir.raku

role File::HomeDir::Win32 {
    method my-home()    { dd }
    method my-desktop() { dd }
}

role File::HomeDir::MacOSX {
    method my-home()    { dd }
    method my-desktop() { dd }
}

role File::HomeDir::Unix {
    method my-home()    { dd }
    method my-desktop() { dd }
}

class File::HomeDir {

    my $singleton;
    sub singleton() {
        without $singleton {
            $_ = File::HomeDir but $*DISTRO.is-win
              ?? File::HomeDir::Win32
              !! $*DISTRO.name.starts-with('macos')
                ?? File::HomeDir::MacOSX
                !! File::HomeDir::Unix;
        }
        $singleton
    }

    method my-home()    { singleton.my-home }
    method my-desktop() { singleton.my-desktop }
}

File::HomeDir.my-home;
File::HomeDir.my-desktop;