5.5.2.56. useOverlay

const OverlayComponent = ({ closeOverlay, heading }) => {
  return (
    <div style={{ position: 'absolute', right: '2rem', top: '2rem', zIndex: 999 }}>
      <h2>{heading}</h2>
      <Button onClick={closeOverlay}>Close</Button>
    </div>
  );
};

const ModalComponent = ({ body, closeOverlay, title }) => (
  <Modal isOpen onClose={closeOverlay}>
    <ModalHeader title={title} />
    <ModalBody>{body}</ModalBody>
  </Modal>
);

const AppPage: React.FC = () => {
  const launchOverlay = useOverlay();
  const onClickOverlay = () => {
    launchOverlay(OverlayComponent, { heading: 'Test overlay' });
  };
  const onClickModal = () => {
    launchOverlay(ModalComponent, { body: 'Test modal', title: 'Overlay modal' });
  };
  return (
    <Button onClick={onClickOverlay}>Launch an Overlay</Button>
    <Button onClick={onClickModal}>Launch a Modal</Button>
  )
}