feat: support critical alert permissions (#3852)

packages/messaging/ios/RNFBMessaging/RNFBMessagingModule.m

@@ -179,6 +179,12 @@ RCT_EXPORT_METHOD(requestPermission:
       options |= UNAuthorizationOptionSound;
     }
 
+    if ([permissions[@"criticalAlert"] isEqual:@(YES)]) {
+      if (@available(iOS 12.0, *)) {
+        options |= UNAuthorizationOptionCriticalAlert;
+      }
+    }
+
     if ([permissions[@"provisional"] isEqual:@(YES)]) {
       if (@available(iOS 12.0, *)) {
         options |= UNAuthorizationOptionProvisional;

packages/messaging/lib/index.d.ts

@@ -399,6 +399,13 @@ export namespace FirebaseMessagingTypes {
      */
     badge?: boolean;
 
+    /**
+     * Request permission for critical alerts.
+     *
+     * Defaults to false.
+     */
+    criticalAlert?: boolean;
+
     /**
      * Request permission to display notifications in a CarPlay environment.
      *

packages/messaging/lib/index.js

@@ -219,6 +219,7 @@ class FirebaseMessagingModule extends FirebaseModule {
       carPlay: true,
       provisional: false,
       sound: true,
+      criticalAlert: false,
     };
 
     if (!permissions) {