From c38b3c1ec198047fd0ac6b6807d36ef364f703f4 Mon Sep 17 00:00:00 2001
From: Javier Cicchelli <javier@rock-n-code.com>
Date: Mon, 5 Dec 2022 22:49:15 +0100
Subject: [PATCH 1/4] Created the DependencyService service in the Libraries
 package.

---
 Libraries/Package.swift | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Libraries/Package.swift b/Libraries/Package.swift
index 99713d6..8e572f0 100644
--- a/Libraries/Package.swift
+++ b/Libraries/Package.swift
@@ -8,11 +8,16 @@ let package = Package(
     products: [
         .library(
             name: "Libraries",
-            targets: ["APIService"]),
+            targets: [
+                "APIService",
+                "DependencyService"
+            ]
+        ),
     ],
     dependencies: [],
     targets: [
         .target(name: "APIService"),
+        .target(name: "DependencyService"),
         .testTarget(
             name: "APIServiceTests",
             dependencies: ["APIService"]

From df4ffad68219f234a566f10d0af1980a71db82c3 Mon Sep 17 00:00:00 2001
From: Javier Cicchelli <javier@rock-n-code.com>
Date: Mon, 5 Dec 2022 22:49:37 +0100
Subject: [PATCH 2/4] Defined the DependencyKey protocol.

---
 .../Protocols/DependencyKey.swift             | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Libraries/Sources/DependencyService/Protocols/DependencyKey.swift

diff --git a/Libraries/Sources/DependencyService/Protocols/DependencyKey.swift b/Libraries/Sources/DependencyService/Protocols/DependencyKey.swift
new file mode 100644
index 0000000..da0254c
--- /dev/null
+++ b/Libraries/Sources/DependencyService/Protocols/DependencyKey.swift
@@ -0,0 +1,19 @@
+//
+//  DependencyKey.swift
+//  DependencyService
+//
+//  Created by Javier Cicchelli on 05/12/2022.
+//  Copyright © 2022 Röck+Cöde. All rights reserved.
+//
+
+public protocol DependencyKey {
+
+    // MARK: Associated types
+
+    associatedtype Value
+    
+    // MARK: Properties
+    
+    static var currentValue: Value { get set }
+    
+}

From 7849945ebfe03b91fe672e9a47699fbed0ea1b2d Mon Sep 17 00:00:00 2001
From: Javier Cicchelli <javier@rock-n-code.com>
Date: Mon, 5 Dec 2022 22:50:36 +0100
Subject: [PATCH 3/4] Implemented the DependencyStore struct.

---
 .../Structs/DependencyStore.swift             | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Libraries/Sources/DependencyService/Structs/DependencyStore.swift

diff --git a/Libraries/Sources/DependencyService/Structs/DependencyStore.swift b/Libraries/Sources/DependencyService/Structs/DependencyStore.swift
new file mode 100644
index 0000000..88ad1e0
--- /dev/null
+++ b/Libraries/Sources/DependencyService/Structs/DependencyStore.swift
@@ -0,0 +1,27 @@
+//
+//  DependencyStore.swift
+//  DependencyService
+//
+//  Created by Javier Cicchelli on 05/12/2022.
+//  Copyright © 2022 Röck+Cöde. All rights reserved.
+//
+
+public struct DependencyStore {
+    
+    // MARK: Properties
+
+    private static var current = Self()
+    
+    // MARK: Functions
+    
+    public static subscript<K>(key: K.Type) -> K.Value where K: DependencyKey {
+        get { key.currentValue }
+        set { key.currentValue = newValue }
+    }
+    
+    public static subscript<D>(_ keyPath: WritableKeyPath<DependencyStore, D>) -> D {
+        get { current[keyPath: keyPath] }
+        set { current[keyPath: keyPath] = newValue }
+    }
+
+}

From a9c81f44faeba623c39ab7acac9280bbe4cf35af Mon Sep 17 00:00:00 2001
From: Javier Cicchelli <javier@rock-n-code.com>
Date: Mon, 5 Dec 2022 22:51:56 +0100
Subject: [PATCH 4/4] Implemented the Dependency property wrapper.

---
 .../Property Wrappers/Dependency.swift        | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Libraries/Sources/DependencyService/Property Wrappers/Dependency.swift

diff --git a/Libraries/Sources/DependencyService/Property Wrappers/Dependency.swift b/Libraries/Sources/DependencyService/Property Wrappers/Dependency.swift
new file mode 100644
index 0000000..d8f21fd
--- /dev/null
+++ b/Libraries/Sources/DependencyService/Property Wrappers/Dependency.swift	
@@ -0,0 +1,29 @@
+//
+//  Dependency.swift
+//  DependencyService
+//
+//  Created by Javier Cicchelli on 05/12/2022.
+//  Copyright © 2022 Röck+Cöde. All rights reserved.
+//
+
+@propertyWrapper
+public struct Dependency<D> {
+    
+    // MARK: Properties
+    
+    private let keyPath: WritableKeyPath<DependencyStore, D>
+    
+    // MARK: Computed
+    
+    public var wrappedValue: D {
+        get { DependencyStore[keyPath] }
+        set { DependencyStore[keyPath] = newValue }
+    }
+    
+    // MARK: Initialisers
+    
+    public init(_ keyPath: WritableKeyPath<DependencyStore, D>) {
+        self.keyPath = keyPath
+    }
+
+}