Port the rest of the code

src/utils/utils.ts

@@ -0,0 +1,40 @@
+import { PrefKey, getPref, setPref } from "../modules/preferences";
+import { UserAgent } from "./user-agent";
+
+export function checkForUpdate() {
+    const CHECK_INTERVAL_SECONDS = 2 * 3600; // check every 2 hours
+
+    const currentVersion = getPref(PrefKey.CURRENT_VERSION);
+    const lastCheck = getPref(PrefKey.LAST_UPDATE_CHECK);
+    const now = Math.round((+new Date) / 1000);
+
+    if (currentVersion === SCRIPT_VERSION && now - lastCheck < CHECK_INTERVAL_SECONDS) {
+        return;
+    }
+
+    // Start checking
+    setPref(PrefKey.LAST_UPDATE_CHECK, now);
+    fetch('https://api.github.com/repos/redphx/better-xcloud/releases/latest')
+        .then(response => response.json())
+        .then(json => {
+            // Store the latest version
+            setPref(PrefKey.LATEST_VERSION, json.tag_name.substring(1));
+            setPref(PrefKey.CURRENT_VERSION, SCRIPT_VERSION);
+        });
+}
+
+
+export function disablePwa() {
+    const userAgent = ((window.navigator as any).orgUserAgent || window.navigator.userAgent || '').toLowerCase();
+    if (!userAgent) {
+        return;
+    }
+
+    // Check if it's Safari on mobile
+    if (UserAgent.isSafari(true)) {
+        // Disable the PWA prompt
+        Object.defineProperty(window.navigator, 'standalone', {
+            value: true,
+        });
+    }
+}