tooot/src/screens/Tabs/Notifications.tsx

import { HeaderCenter } from '@components/Header'
import Timeline from '@components/Timeline'
import sharedScreens from '@screens/Tabs/Shared/sharedScreens'
import { updateInstanceNotification } from '@utils/slices/instancesSlice'
import React, { useCallback, useMemo } from 'react'
import { useTranslation } from 'react-i18next'
import { Platform, ViewToken } from 'react-native'
import { createNativeStackNavigator } from 'react-native-screens/native-stack'
import { useDispatch } from 'react-redux'

const Stack = createNativeStackNavigator<Nav.TabNotificationsStackParamList>()

const TabNotifications = React.memo(
  () => {
    const { t } = useTranslation()
    const dispatch = useDispatch()

    const screenOptions = useMemo(
      () => ({
        headerTitle: t('notifications:heading'),
        ...(Platform.OS === 'android' && {
          headerCenter: () => (
            <HeaderCenter content={t('notifications:heading')} />
          )
        }),
        headerHideShadow: true,
        headerTopInsetEnabled: false
      }),
      []
    )
    const children = useCallback(
      ({ navigation }) => (
        <Timeline
          page='Notifications'
          customProps={{
            viewabilityConfigCallbackPairs: [
              {
                onViewableItemsChanged: ({
                  viewableItems
                }: {
                  viewableItems: ViewToken[]
                }) => {
                  if (
                    navigation.isFocused() &&
                    viewableItems.length &&
                    viewableItems[0].index === 0
                  ) {
                    dispatch(
                      updateInstanceNotification({
                        readTime: viewableItems[0].item.created_at
                      })
                    )
                  }
                },
                viewabilityConfig: {
                  minimumViewTime: 100,
                  itemVisiblePercentThreshold: 60
                }
              }
            ]
          }}
        />
      ),
      []
    )

    return (
      <Stack.Navigator screenOptions={screenOptions}>
        <Stack.Screen name='Tab-Notifications-Root' children={children} />
        {sharedScreens(Stack as any)}
      </Stack.Navigator>
    )
  },
  () => true
)

export default TabNotifications