rnfa-rb42/src/utils/platform.js

Original project: https://github.com/santomegonzalo/react-native-floating-action

import { Dimensions, Platform } from "react-native";

export function isIphoneX() {
  const dimension = Dimensions.get("window");

  return (
    Platform.OS === "ios" &&
    !Platform.isPad &&
    !Platform.isTVOS &&
    (dimension.height === 812 || dimension.width === 812)
  );
}