chore: add nitrogen postprocess to make HybridRiveViewManager open

Nitro 0.35 generates final ViewManager classes, preventing
onDropViewInstance override needed for view lifecycle cleanup.
Added a postprocess script to patch the generated class as open.

Author: mfazekas

example/assets/rive/counter.riv

@@ -1,3 +1,4 @@
+import '@example/polyfills';
 import { useLocalSearchParams, Stack } from 'expo-router';
 import { PagesList, type PageItem } from '@example/PagesList';
 import { View, Text, StyleSheet } from 'react-native';

expo-example/app/[pageId].tsx

@@ -1,3 +1,4 @@
+import '@example/polyfills';
 import {
   DarkTheme,
   DefaultTheme,

expo-example/app/_layout.tsx

@@ -1,3 +1,4 @@
+import '@example/polyfills';
 import { useEffect, useState } from 'react';
 import { StyleSheet, TouchableOpacity } from 'react-native';
 import { useRouter } from 'expo-router';

expo-example/app/index.tsx

@@ -25,6 +25,7 @@ const MAPPING = {
   'paperplane.fill': 'send',
   'chevron.left.forwardslash.chevron.right': 'code',
   'chevron.right': 'chevron-right',
+  'wrench.fill': 'build',
 } as IconMapping;
 
 /**

expo-example/components/ui/icon-symbol.tsx

@@ -39,7 +39,7 @@
     "lint": "eslint \"**/*.{js,ts,tsx}\"",
     "clean": "del-cli android/build example/android/build example/android/app/build example/ios/build lib",
     "prepare": "npx react-native-builder-bob@^0.40.0 build",
-    "nitrogen": "nitrogen",
+    "nitrogen": "nitrogen && npx tsx scripts/nitrogen-postprocess.ts",
     "release": "release-it",
     "dev:ios": "cd example && xed ios",
     "dev:android": "cd example && open -a \"/Applications/Android Studio.app\" ./android",

nitrogen/generated/android/kotlin/com/margelo/nitro/rive/views/HybridRiveViewManager.kt

@@ -0,0 +1,31 @@
+import { readFileSync, writeFileSync, existsSync } from 'fs';
+import { join } from 'path';
+
+const ROOT = join(__dirname, '..');
+const MANAGER_FILE = join(
+  ROOT,
+  'nitrogen/generated/android/kotlin/com/margelo/nitro/rive/views/HybridRiveViewManager.kt'
+);
+
+function makeHybridRiveViewManagerOpen() {
+  if (!existsSync(MANAGER_FILE)) {
+    console.warn('HybridRiveViewManager.kt not found, skipping');
+    return;
+  }
+
+  const content = readFileSync(MANAGER_FILE, 'utf-8');
+  const updated = content.replace(
+    'public class HybridRiveViewManager',
+    'public open class HybridRiveViewManager'
+  );
+
+  if (content === updated) {
+    console.log('HybridRiveViewManager is already open');
+    return;
+  }
+
+  writeFileSync(MANAGER_FILE, updated);
+  console.log('Made HybridRiveViewManager open');
+}
+
+makeHybridRiveViewManagerOpen();