Get it working without images

.gitignore

@@ -31,3 +31,4 @@ Pods
 
 # Carthage
 Carthage
+/.build

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "SwiftHash",
+        "repositoryURL": "https://github.com/onmyway133/SwiftHash.git",
+        "state": {
+          "branch": null,
+          "revision": "1387bd2a614060ff516b3aa1279354b139b3e6f1",
+          "version": "2.0.1"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -1,22 +1,30 @@
 // swift-tools-version:4.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
 
-var package = Package(
+let package = Package(
     name: "Cache",
     products: [
-      .library(
-        name: "Cache",
-        targets: ["Cache"]
-      )
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "Cache",
+            targets: ["Cache"]),
     ],
     dependencies: [
-       .package(url: "https://github.com/onmyway133/SwiftHash.git", .upToNextMinor(from: "2.0.0")),
+        // Dependencies declare other packages that this package depends on.
+        .package(url: "https://github.com/onmyway133/SwiftHash.git", .upToNextMinor(from: "2.0.0")),
     ],
     targets: [
-      .target(
-        name: "Cache",
-        dependencies: ["Cache"]
-        )
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "Cache",
+            dependencies: ["SwiftHash"],
+            path: "Source/Shared"),
+        .testTarget(
+            name: "CacheTests",
+            dependencies: ["Cache"],
+            path: "Tests"),
     ]
 )

Source/Shared/Library/ImageWrapper.swift

@@ -1,32 +0,0 @@
-import Foundation
-
-public struct ImageWrapper: Codable {
-  public let image: Image
-
-  public enum CodingKeys: String, CodingKey {
-    case image
-  }
-
-  public init(image: Image) {
-    self.image = image
-  }
-
-  public init(from decoder: Decoder) throws {
-    let container = try decoder.container(keyedBy: CodingKeys.self)
-    let data = try container.decode(Data.self, forKey: CodingKeys.image)
-    guard let image = Image(data: data) else {
-      throw StorageError.decodingFailed
-    }
-
-    self.image = image
-  }
-
-  public func encode(to encoder: Encoder) throws {
-    var container = encoder.container(keyedBy: CodingKeys.self)
-    guard let data = image.cache_toData() else {
-        throw StorageError.encodingFailed
-    }
-
-    try container.encode(data, forKey: CodingKeys.image)
-  }
-}