react-navigation-stack/lib/module/vendor/utils/useHeaderHeight.js

Stack navigator component for React Navigation

import * as React from 'react';
import HeaderHeightContext from './HeaderHeightContext';
export default function useFloatingHeaderHeight() {
  const height = React.useContext(HeaderHeightContext);

  if (height === undefined) {
    throw new Error("Couldn't find the header height. Are you inside a screen in Stack?");
  }

  return height;
}
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