Introduce "Extension info" screen

src/Asserts.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { AssertionError } from 'assert';
+
+export function assertIsDefined<T>(value: T | undefined): asserts value is NonNullable<T> {
+    if (value === undefined || value === null) {
+        throw new AssertionError({ message: 'Value is undefined or null' });
+    }
+}