os.ps1

$isDesktop = $PSEdition -eq "Desktop"
$isCore = $PSEdition -eq "Core"
if ($isDesktop -or ($isCore -and $IsWindows)) {
	Write-Output Windows
}
elseif ($isCore -and $IsLinux) {
	Write-Output Linux
}
elseif ($isCore -and $IsMacOS) {
	Write-Output macOS
}
else {
	throw "This version of PowerShell is not supported"
}