diff --git a/Package.resolved b/Package.resolved
new file mode 100644
index 0000000..1c1dcbe
--- /dev/null
+++ b/Package.resolved
@@ -0,0 +1,43 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "CwlCatchException",
+        "repositoryURL": "https://github.com/mattgallagher/CwlCatchException.git",
+        "state": {
+          "branch": null,
+          "revision": "3b123999de19bf04905bc1dfdb76f817b0f2cc00",
+          "version": "2.1.2"
+        }
+      },
+      {
+        "package": "CwlPreconditionTesting",
+        "repositoryURL": "https://github.com/mattgallagher/CwlPreconditionTesting.git",
+        "state": {
+          "branch": null,
+          "revision": "a23ded2c91df9156628a6996ab4f347526f17b6b",
+          "version": "2.1.2"
+        }
+      },
+      {
+        "package": "Nimble",
+        "repositoryURL": "https://github.com/Quick/Nimble",
+        "state": {
+          "branch": null,
+          "revision": "831000dd1939bc2096df572c5fd156f41d858bfa",
+          "version": "12.1.0"
+        }
+      },
+      {
+        "package": "Quick",
+        "repositoryURL": "https://github.com/Quick/Quick",
+        "state": {
+          "branch": null,
+          "revision": "16910e406be96e08923918315388c3e989deac9e",
+          "version": "6.1.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..0c6942d
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,20 @@
+// swift-tools-version:5.5
+import PackageDescription
+
+let package = Package(
+    name: "SpecTools",
+    platforms: [
+        .iOS("11.0"),
+        .tvOS("11.0")
+    ],
+    products: [
+        .library(name: "SpecTools", targets: ["SpecTools"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/Quick/Quick", .upToNextMajor(from: "7.0.0")),
+        .package(url: "https://github.com/Quick/Nimble", .upToNextMajor(from: "12.0.0")),
+    ],
+    targets: [
+        .target(name: "SpecTools", path: "SpecTools/Classes"),
+    ]
+)
diff --git a/SpecTools/Classes/Visualize.swift b/SpecTools/Classes/Visualize.swift
index a4105f0..47d716e 100644
--- a/SpecTools/Classes/Visualize.swift
+++ b/SpecTools/Classes/Visualize.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import UIKit
 
 
 // MARK: - Settings