fix flow checks

packages/rn-tester/js/RNTesterAppShared.js

@@ -13,7 +13,7 @@ import type {RNTesterModuleInfo, ScreenTypes} from './types/RNTesterTypes';
 import ReportFullyDrawnView from '../ReportFullyDrawnView/ReportFullyDrawnView';
 import RNTesterModuleContainer from './components/RNTesterModuleContainer';
 import RNTesterModuleList from './components/RNTesterModuleList';
-import RNTesterNavBar, {navBarHeight} from './components/RNTesterNavbar';
+import RNTesterNavBar from './components/RNTesterNavbar';
 import {RNTesterThemeContext, themes} from './components/RNTesterTheme';
 import RNTTitleBar from './components/RNTTitleBar';
 import {title as PlaygroundTitle} from './examples/Playground/PlaygroundExample';
@@ -330,7 +330,10 @@ const styles = StyleSheet.create({
     flex: 1,
   },
   bottomNavbar: {
-    height: navBarHeight,
+    height: Platform.select({
+      android: 58,
+      ios: 68,
+    }),
   },
   hidden: {
     display: 'none',

packages/rn-tester/js/components/RNTesterNavbar.js

@@ -28,7 +28,7 @@ const NavbarButton = ({
   iconStyle,
 }): React.Node => {
   const theme = useContext(RNTesterThemeContext);
-  const [isPressed, setPressed] = useState();
+  const [isPressed, setPressed] = useState(false);
 
   return (
     <Pressable
@@ -108,11 +108,6 @@ const RNTesterNavbar = ({
   );
 };
 
-export const navBarHeight = Platform.select({
-  android: 58,
-  ios: 68,
-});
-
 const styles = StyleSheet.create({
   buttonContainer: {
     flex: 1,
@@ -129,7 +124,6 @@ const styles = StyleSheet.create({
   },
   navButton: {
     flex: 1,
-    height: navBarHeight,
     justifyContent: 'center',
     alignItems: 'center',
     paddingBottom: Platform.select({