react-native-ui-lib/typings/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));
}