App.js

import "./build";

import React from "react";
import { useMediaQuery } from "react-responsive";
import { View, Platform, Text } from "react-native";

function Header({ style, ...props } = {}) {
  return (
    <Text
      accessibilityLabel="header"
      style={[
        {
          fontWeight: "bold",
          marginBottom: 24,
          fontSize: Platform.select({ web: "2.25rem", default: 2.25 * 16 })
        },
        style
      ]}
      {...props}
    />
  );
}

export default function App() {
  const isDesktopOrLaptop = useMediaQuery({
    query: "(min-device-width: 1224px)"
  });
  const isBigScreen = useMediaQuery({ query: "(min-device-width: 1824px)" });
  const isTabletOrMobile = useMediaQuery({ query: "(max-width: 1224px)" });
  const isTabletOrMobileDevice = useMediaQuery({
    query: "(max-device-width: 1224px)"
  });
  const isPortrait = useMediaQuery({ query: "(orientation: portrait)" });
  const isRetina = useMediaQuery({ query: "(min-resolution: 2dppx)" });

  return (
    <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
      <Header>Device Test!</Header>
      {isDesktopOrLaptop && (
        <>
          <Text>You are a desktop or laptop</Text>
          {isBigScreen && <Text>You also have a huge screen</Text>}
          {isTabletOrMobile && <Text>You are sized like a tablet or mobile phone though</Text>}
        </>
      )}
      {isTabletOrMobileDevice && <Text>You are a tablet or mobile phone</Text>}
      <Text>
        Your are in {isPortrait ? "portrait" : "landscape"} orientation
      </Text>
      {isRetina && <Text>You are retina</Text>}
    </View>
  );
}