Now returns a (discardable) Bool for registering and/or enabling shortcuts, so we know if it worked or not.

Sources/KeyboardShortcuts/CarbonKeyboardShortcuts.swift

@@ -37,12 +37,12 @@ enum CarbonKeyboardShortcuts {
 	private static var hotKeyId = 0
 	private static var eventHandler: EventHandlerRef?
 
-	private static func setUpEventHandlerIfNeeded() {
+	private static func setUpEventHandlerIfNeeded() -> Bool {
 		guard
 			eventHandler == nil,
 			let dispatcher = GetEventDispatcherTarget()
 		else {
-			return
+			return false
 		}
 
 		let eventSpecs = [
@@ -50,21 +50,23 @@ enum CarbonKeyboardShortcuts {
 			EventTypeSpec(eventClass: OSType(kEventClassKeyboard), eventKind: UInt32(kEventHotKeyReleased))
 		]
 
-		InstallEventHandler(
+		guard InstallEventHandler(
 			dispatcher,
 			carbonKeyboardShortcutsEventHandler,
 			eventSpecs.count,
 			eventSpecs,
 			nil,
 			&eventHandler
-		)
+		) == noErr else { return false }
+		
+		return true
 	}
 
-	static func register(
+	@discardableResult static func register(
 		_ shortcut: KeyboardShortcuts.Shortcut,
 		onKeyDown: @escaping (KeyboardShortcuts.Shortcut) -> Void,
 		onKeyUp: @escaping (KeyboardShortcuts.Shortcut) -> Void
-	) {
+	) -> Bool {
 		hotKeyId += 1
 
 		var eventHotKey: EventHotKeyRef?
@@ -81,7 +83,7 @@ enum CarbonKeyboardShortcuts {
 			registerError == noErr,
 			let carbonHotKey = eventHotKey
 		else {
-			return
+			return false
 		}
 
 		hotKeys[hotKeyId] = HotKey(
@@ -92,7 +94,7 @@ enum CarbonKeyboardShortcuts {
 			onKeyUp: onKeyUp
 		)
 
-		setUpEventHandlerIfNeeded()
+		return setUpEventHandlerIfNeeded()
 	}
 
 	private static func unregisterHotKey(_ hotKey: HotKey) {

Sources/KeyboardShortcuts/KeyboardShortcuts.swift

@@ -37,18 +37,22 @@ public enum KeyboardShortcuts {
 	*/
 	static var isPaused = false
 
-	private static func register(_ shortcut: Shortcut) {
+	@discardableResult private static func register(_ shortcut: Shortcut) -> Bool {
 		guard !registeredShortcuts.contains(shortcut) else {
-			return
+			return true //already registered
 		}
 
-		CarbonKeyboardShortcuts.register(
+		let keyboardShortcutRegistered = CarbonKeyboardShortcuts.register(
 			shortcut,
 			onKeyDown: handleOnKeyDown,
 			onKeyUp: handleOnKeyUp
 		)
 
+		guard keyboardShortcutRegistered else { return false }
+		
 		registeredShortcuts.insert(shortcut)
+		
+		return true
 	}
 
 	/**
@@ -129,12 +133,12 @@ public enum KeyboardShortcuts {
 	/**
 	Enable a disabled keyboard shortcut.
 	*/
-	public static func enable(_ name: Name) {
+	@discardableResult public static func enable(_ name: Name) -> Bool {
 		guard let shortcut = getShortcut(for: name) else {
-			return
+			return false
 		}
 
-		register(shortcut)
+		return register(shortcut)
 	}
 
 	/**