Create AppConfig module and AppLocations.

AppConfig/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

AppConfig/Package.swift

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+// swift-tools-version: 5.10
+
+import PackageDescription
+
+let package = Package(
+	name: "AppConfig",
+	products: [
+		.library(
+			name: "AppConfig",
+			targets: ["AppConfig"]),
+	],
+	targets: [
+		.target(
+			name: "AppConfig",
+			swiftSettings: [
+				.enableExperimentalFeature("StrictConcurrency")
+			]
+		),
+		.testTarget(
+			name: "AppConfigTests",
+			dependencies: ["AppConfig"]),
+	]
+)

AppConfig/Sources/AppConfig/AppLocations.swift

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+//
+//  AppLocations.swift
+//  NetNewsWire
+//
+//  Created by Brent Simmons on 6/26/24.
+//  Copyright © 2024 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+@MainActor public final class AppLocations {
+
+	private static var cacheFolder: URL = {
+
+		let folderURL: URL
+
+		if let userCacheFolder = try? FileManager.default.url(for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: true) {
+			folderURL = userCacheFolder
+		} else {
+			let bundleIdentifier = (Bundle.main.infoDictionary!["CFBundleIdentifier"]! as! String)
+			let tempFolder = (NSTemporaryDirectory() as NSString).appendingPathComponent(bundleIdentifier)
+			folderURL = URL(fileURLWithPath: tempFolder, isDirectory: true)
+			try! FileManager.default.createDirectory(at: folderURL, withIntermediateDirectories: true, attributes: nil)
+		}
+
+		return folderURL
+	}()
+
+	public static var faviconsFolder: URL = {
+		return createSubfolder(named: "Favicons", in: cacheFolder)
+	}()
+
+	public static var imagesFolder: URL = {
+		return createSubfolder(named: "Images", in: cacheFolder)
+	}()
+}
+
+private extension AppLocations {
+
+	static func createSubfolder(named subfolderName: String, in folderURL: URL) -> URL {
+
+		let folder = folderURL.appendingPathComponent(subfolderName, isDirectory: true)
+		try! FileManager.default.createDirectory(at: folder, withIntermediateDirectories: true, attributes: nil)
+		return folder
+	}
+}

AppConfig/Tests/AppConfigTests/AppConfigTests.swift

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+import XCTest
+@testable import AppConfig
+
+final class AppConfigTests: XCTestCase {
+    func testExample() throws {
+        // XCTest Documentation
+        // https://developer.apple.com/documentation/xctest
+
+        // Defining Test Cases and Test Methods
+        // https://developer.apple.com/documentation/xctest/defining_test_cases_and_test_methods
+    }
+}