Как получить высоту keyboard до его открытия в react native?

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import { Keyboard, KeyboardEvent } from 'react-native';

// ...

componentWillMount() {
  this.keyboardWillShowListener = Keyboard.addListener(
    'keyboardWillShow',
    this.keyboardWillShow,
  );
  this.keyboardWillHideListener = Keyboard.addListener(
    'keyboardWillHide',
    this.keyboardWillHide,
  );
}

componentWillUnmount() {
  this.keyboardWillShowListener.remove();
  this.keyboardWillHideListener.remove();
}

keyboardWillShow = (event: KeyboardEvent) => {
  const keyboardHeight = event.endCoordinates.height;
  // ...
};

keyboardWillHide = () => {
  // ...
};