refactor: migrate app.config and Expo config plugins to TypeScript (#1718)

plugins/withAndroidManifest.ts

@@ -0,0 +1,46 @@
+import { type ConfigPlugin, withAndroidManifest } from "expo/config-plugins";
+
+const withGoogleCastAndroidManifest: ConfigPlugin = (config) =>
+  withAndroidManifest(config, async (mod) => {
+    const mainApplication = mod.modResults.manifest.application?.[0];
+
+    if (!mainApplication) {
+      return mod;
+    }
+
+    // Initialize activity array if it doesn't exist
+    if (!mainApplication.activity) {
+      mainApplication.activity = [];
+    }
+
+    const googleCastActivityExists = mainApplication.activity.some(
+      (activity) =>
+        activity.$?.["android:name"] ===
+        "com.reactnative.googlecast.RNGCExpandedControllerActivity",
+    );
+
+    // Only add the activity if it doesn't already exist
+    if (!googleCastActivityExists) {
+      mainApplication.activity.push({
+        $: {
+          "android:name":
+            "com.reactnative.googlecast.RNGCExpandedControllerActivity",
+          "android:theme": "@style/Theme.MaterialComponents.NoActionBar",
+          "android:launchMode": "singleTask",
+          "android:exported": "false",
+        },
+      });
+    }
+
+    const mainActivity = mainApplication.activity.find(
+      (activity) => activity.$?.["android:name"] === ".MainActivity",
+    );
+
+    if (mainActivity?.$) {
+      mainActivity.$["android:supportsPictureInPicture"] = "true";
+    }
+
+    return mod;
+  });
+
+export default withGoogleCastAndroidManifest;