Add watchOS support

Package.swift

@@ -11,7 +11,8 @@ let package = Package(
         .iOS(.v15),
         .macOS(.v12),
         .macCatalyst(.v15),
-        .tvOS(.v15)
+        .tvOS(.v15),
+        .watchOS(.v8)
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Sources/Pow/Effects/ShakeEffect.swift

@@ -1,5 +1,6 @@
 import SwiftUI
 
+#if !os(watchOS)
 public extension AnyChangeEffect {
     /// An effect that shakes the view when a change happens.
     static var shake: AnyChangeEffect {
@@ -32,7 +33,9 @@ public extension AnyChangeEffect {
         }
     }
 }
+#endif
 
+#if !os(watchOS)
 internal struct ShakeSimulationModifier: ViewModifier, Simulative {
     // TODO: Not used, remove from protocol
     var initialVelocity: CGFloat = 0
@@ -102,6 +105,7 @@ internal struct ShakeSimulationModifier: ViewModifier, Simulative {
         shakeCount = clamp(0, shakeCount - 2 * (step / phaseLength), .infinity)
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 struct ShakeSimulation_Previews: PreviewProvider {

Sources/Pow/Effects/SmokeEffect.swift

@@ -4,6 +4,7 @@ import simd
 import SnapshotPreferences
 #endif
 
+#if !os(watchOS)
 public extension AnyConditionalEffect {
     /// An effect that emits smoke from the view.
     static var smoke: AnyConditionalEffect {
@@ -21,7 +22,9 @@ public extension AnyConditionalEffect {
         )
     }
 }
+#endif
 
+#if !os(watchOS)
 private struct SmokeEffect: ViewModifier, Continuous {
     var isActive: Bool
 
@@ -69,6 +72,7 @@ private struct SmokeEffect: ViewModifier, Continuous {
         }
     }
 }
+#endif
 
 #if os(iOS) || os(visionOS) || os(tvOS)
 private class EmitterView: UIView {
@@ -108,6 +112,7 @@ private class EmitterView: NSView {
 }
 #endif
 
+#if !os(watchOS)
 private struct SmokeLayerView: ViewRepresentable {
     var size: CGSize
 
@@ -171,8 +176,9 @@ private struct SmokeLayerView: ViewRepresentable {
         view.emitterLayer.lifetime = isActive ? 1 : 0
     }
 }
+#endif
 
-#if DEBUG && !os(tvOS)
+#if DEBUG && !os(tvOS) && !os(watchOS)
 struct ContinuousParticleEffect_Previews: PreviewProvider {
     private struct Preview: View {
         @State

Sources/Pow/Effects/SpinEffect.swift

@@ -1,5 +1,6 @@
 import SwiftUI
 
+#if !os(watchOS)
 public extension AnyChangeEffect {
     /// The rate of the spin effect.
     enum SpinRate {
@@ -47,7 +48,9 @@ public extension AnyChangeEffect {
         }
     }
 }
+#endif
 
+#if !os(watchOS)
 internal struct SpinSimulationModifier: ViewModifier, Simulative {
     var impulseCount: Int
 
@@ -143,6 +146,7 @@ internal struct SpinSimulationModifier: ViewModifier, Simulative {
         }
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 struct SpinSimulation_Previews: PreviewProvider {

Sources/Pow/Effects/WiggleEffect.swift

@@ -1,5 +1,6 @@
 import SwiftUI
 
+#if !os(watchOS)
 public extension AnyChangeEffect {
     /// An effect that wiggles the view when a change happens.
     static var wiggle: AnyChangeEffect {
@@ -30,7 +31,9 @@ public extension AnyChangeEffect {
         })
     }
 }
+#endif
 
+#if !os(watchOS)
 internal struct WiggleSimulationModifier: ViewModifier, Simulative {
     // TODO: Not used, remove from protocol
     var initialVelocity: CGFloat = 0
@@ -104,6 +107,7 @@ internal struct WiggleSimulationModifier: ViewModifier, Simulative {
         wiggleCount = clamp(0, wiggleCount - 2 * (step / phaseLength), .infinity)
     }
 }
+#endif
 
 
 #if os(iOS) && DEBUG

Sources/Pow/Extensions/Duration+TimeInterval.swift

@@ -3,6 +3,7 @@ import Foundation
 @available(iOS 16.0, *)
 @available(macOS 13.0, *)
 @available(tvOS 16.0, *)
+@available(watchOS 9.0, *)
 internal extension Duration {
     var timeInterval: TimeInterval {
         TimeInterval(components.seconds) + TimeInterval(components.attoseconds) / 1e18

Sources/Pow/Extensions/ProjectionTransform+Utilities.swift

@@ -1,6 +1,7 @@
 import simd
 import SwiftUI
 
+#if !os(watchOS)
 internal extension ProjectionTransform {
     init(_ m: simd_double4x4) {
         let d = CATransform3D(
@@ -13,3 +14,4 @@ internal extension ProjectionTransform {
         self.init(d)
     }
 }
+#endif

Sources/Pow/Infrastructure/AngleControl.swift

@@ -1,6 +1,7 @@
 #if !os(tvOS)
 import SwiftUI
 
+@available(watchOS 9.0, *)
 struct AngleControl<Label: View>: View {
     @Binding
     var angle: Angle
@@ -81,6 +82,7 @@ struct AngleControl<Label: View>: View {
     }
 }
 
+@available(watchOS 9.0, *)
 extension AngleControl where Label == Text {
     init(_ title: some StringProtocol, angle: Binding<Angle>) {
         self._angle = angle
@@ -106,6 +108,7 @@ extension AngleControl where Label == Text {
     }
 }
 
+@available(watchOS 9.0, *)
 struct AngleControl_Previews: PreviewProvider {
     struct Preview: View {
         @State var angle: Angle = .zero

Sources/Pow/Infrastructure/Transform3DEffect.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 import simd
 
+#if !os(watchOS)
 internal struct Transform3DEffect: GeometryEffect, Animatable {
     var animatableData: AnimatablePair<TRS, AnimatablePair<Anchor3D, Double>> = .zero
 
@@ -69,15 +70,19 @@ internal struct Transform3DEffect: GeometryEffect, Animatable {
         ShadedTransform3DEffect(animatableData: animatableData, lightSource: lightSource)
     }
 }
+#endif
 
+#if !os(watchOS)
 extension Transform3DEffect {
     internal struct Anchor3D: Equatable {
         var xy: UnitPoint = .center
 
         var z: Double = 0
     }
 }
+#endif
 
+#if !os(watchOS)
 extension Transform3DEffect.Anchor3D: VectorArithmetic {
     mutating func scale(by rhs: Double) {
         xy.x *= rhs
@@ -111,7 +116,9 @@ extension Transform3DEffect.Anchor3D: VectorArithmetic {
         return result
     }
 }
+#endif
 
+#if !os(watchOS)
 internal struct ShadedTransform3DEffect: ViewModifier, Animatable {
     var animatableData: Transform3DEffect.AnimatableData
 
@@ -147,6 +154,7 @@ internal struct ShadedTransform3DEffect: ViewModifier, Animatable {
             .modifier(Transform3DEffect(animatableData: animatableData))
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 @available(iOS 16.0, *)

Sources/Pow/Infrastructure/WhileEffect.swift

@@ -55,6 +55,7 @@ public struct AnyConditionalEffect {
     @available(iOS 16.0, *)
     @available(macOS 13.0, *)
     @available(tvOS 16.0, *)
+    @available(watchOS 9.0, *)
     public static func `repeat`(_ effect: AnyChangeEffect, every interval: Duration) -> AnyConditionalEffect {
         AnyConditionalEffect(guts: .repeating(effect, interval.timeInterval))
     }

Sources/Pow/Transitions/Flip.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 import simd
 
+#if !os(watchOS)
 public extension AnyTransition.MovingParts {
     /// A transition that inserts by rotating the view towards the viewer, and
     /// removes by rotating the view away from the viewer.
@@ -64,6 +65,7 @@ public extension AnyTransition.MovingParts {
         )
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 @available(iOS 15.0, *)

Sources/Pow/Transitions/Move.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 import simd
 
+#if !os(watchOS)
 public extension AnyTransition.MovingParts {
     /// A transition that moves the view from the specified edge of the on
     /// insertion and towards it on removal.
@@ -35,7 +36,9 @@ public extension AnyTransition.MovingParts {
         )
     }
 }
+#endif
 
+#if !os(watchOS)
 internal struct Move: GeometryEffect, Animatable {
     /// Translation is relative, depth is ignored, anchor is always
     /// `UnitPoint(0.5, 0.5)`.
@@ -90,6 +93,7 @@ internal struct Move: GeometryEffect, Animatable {
         return ProjectionTransform((((offset * translation) * rotation) * scale) * offset.inverse)
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 @available(iOS 15.0, *)

Sources/Pow/Transitions/Swoosh.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 import simd
 
+#if !os(watchOS)
 public extension AnyTransition.MovingParts {
     /// A three-dimensional transition from the back of the towards the front
     /// during insertion and from the front towards the back during removal.
@@ -21,6 +22,7 @@ public extension AnyTransition.MovingParts {
         )
     }
 }
+#endif
 
 #if os(iOS) && DEBUG
 @available(iOS 15.0, *)