@react-navigation/bottom-tabs/lib/module/utils/useBottomTabBarHeight.js

Bottom tab navigator following iOS design guidelines

import * as React from 'react';
import BottomTabBarHeightContext from './BottomTabBarHeightContext';
export default function useBottomTabBarHeight() {
  const height = React.useContext(BottomTabBarHeightContext);
  if (height === undefined) {
    throw new Error("Couldn't find the bottom tab bar height. Are you inside a screen in Bottom Tab Navigator?");
  }
  return height;
}
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