TYPESCRIPT

VirtualizedLists should never be nested inside plain ScrollViews with the same orientation - use another VirtualizedList-backed container instead.

Here is a VirutalizedList -backed container implementation using FlatList:

import React from 'react';
import { FlatList } from 'react-native';

export default function VirtualizedView(props: any) {
  return (
    <FlatList
      data={[]}
      ListEmptyComponent={null}
      keyExtractor={() => "dummy"}
      renderItem={null}
      ListHeaderComponent={() => (
        <React.Fragment>{props.children}</React.Fragment>
      )}
    />
  );
}
Usage:

<VirtualizedView>
  <Text>Anything goes here</Text>
  <FlatList 
    data={data}
    keyExtractor={keyExtractor}
    renderItem={({item}) => <Item data={item} />}
    onRefresh={refetch}
    refreshing={loading}
    onEndReached={concatData}
  />
</VirtualizedView>

This will show scrollbar when you rotate your iPhone, and also remove warning message and performance will be saved without any problem.

VirtualizedLists should never be nested inside plain ScrollViews with the same orientation - use another VirtualizedList-backed container instead

<SafeAreaView style={{flex: 1}}>
    <FlatList
      data={data}
      ListHeaderComponent={ContentThatGoesAboveTheFlatList}
      ListFooterComponent={ContentThatGoesBelowTheFlatList} />
</SafeAreaView>

virtualizedlists should never be nested inside plain scrollviews with the same orientation

<ScrollView>
    {data.map((item, index) => {
        ...your code
    }}
</ScrollView>