react-native-ui-lib/src/helpers/Constants.js

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import {Platform, Dimensions, NativeModules} from 'react-native';

const {StatusBarManager} = NativeModules;
const {height, width} = Dimensions.get('window');

export const isAndroid = Platform.OS === 'android';
export const isIOS = Platform.OS === 'ios';
export const screenWidth = width;
export const screenHeight = height;
export const isSmallScreen = isIOS ? screenWidth <= 320 : screenWidth <= 360;
export const isShortScreen = screenHeight <= 600;
export let statusBarHeight = isIOS ? 20 : StatusBarManager.HEIGHT; // eslint-disable-line
export const isIphoneX = isIOS && !Platform.isPad && !Platform.isTVOS && (screenHeight === 812 || screenWidth === 812);

// override guesstimate height with the actual height from StatusBarManager
if (isIOS) {
  StatusBarManager.getHeight(data => (statusBarHeight = data.height));
}