err := beeep.Beep(beeep.DefaultFreq, beeep.DefaultDuration)
if err != nil {
    panic(err)
}

//go:embed testdata/info.png
var icon []byte

err := beeep.Notify("Title", "Message body", icon)
if err != nil {
    panic(err)
}

beeep.AppName = "My App Name"

err := beeep.Alert("Title", "Message body", "testdata/warning.png")
if err != nil {
    panic(err)
}