Not that I actually need it myself right now, but I was cross-compiling my app for completeness and got this:

# github.com/janeczku/go-spinner
../../Projects/Go/pkg/mod/github.com/janeczku/go-spinner@v0.0.0-20150530144529-cf8ef1d64394/spinner.go:39:25: cannot use syscall.Stdout (type syscall.Handle) as type int in argument to terminal.IsTerminal

Probably the simplest thing is either to assume that Windows is always a TTY, or never a TTY — probably the latter since I'm guessing there will be other issues. An explicit type assertion on syscall.Stdout would probably take care of the compilation error; I can submit a PR if you think that makes sense.