Mark storage as persistent

src/index.ts

@@ -6,6 +6,10 @@ if ("serviceWorker" in window.navigator) {
 	window.navigator.serviceWorker.register("/service-worker.js").then((registration: ServiceWorkerRegistration): void => window.console.log(`ServiceWorker registration successful with scope: ${registration.scope}`), (error: string): void => window.console.log(`ServiceWorker registration failed: ${error}`));
 }
 
+if ("storage" in window.navigator) {
+	window.navigator.storage.persist().catch((error: string): void => window.console.log(error));
+}
+
 // Get a reference to the application controller singleton
 const appController = new ApplicationController();
 

src/mocks/window-mock.ts

@@ -4,12 +4,14 @@ import sinon from "sinon";
 interface NavigatorMock {
 	onLine: boolean;
 	serviceWorker: { register: SinonStub; };
+	storage: { persist: SinonStub; };
 }
 
 class WindowMock {
 	public readonly navigator: NavigatorMock = {
 		onLine: true,
-		serviceWorker: { register: sinon.stub() }
+		serviceWorker: { register: sinon.stub() },
+		storage: { persist: sinon.stub() }
 	};
 
 	public readonly alert: SinonStub = sinon.stub();