id.swift

fileprivate extension NSTouchBarCustomizationIdentifier {
    static let windowBar = NSTouchBarCustomizationIdentifier("com.n3tr.countertouchbar.touchbar")
}

fileprivate extension NSTouchBarItemIdentifier {
    static let label = NSTouchBarItemIdentifier("com.n3tr.countertouchbar.label")
}

class WindowController: NSWindowController {
  // ...
}