@atlaskit/portal/dist/esm/internal/components/internal-portal.js

A wrapper for rendering components in React portals.

import { useEffect, useMemo } from 'react';
import { createPortal } from 'react-dom';
import { appendPortalContainerIfNotAppended, createContainer, removePortalContainer } from '../utils/portal-dom-utils';
export default function InternalPortal(props) {
  var zIndex = props.zIndex,
    children = props.children;
  var container = useMemo(function () {
    return createContainer(zIndex);
  }, [zIndex]);

  // This is in the render method instead of useEffect so that
  // the portal will be added to the DOM before the children render.
  // For any further changes, ensure that the container does not have a
  // parent besides the portal parent.
  appendPortalContainerIfNotAppended(container);
  useEffect(function () {
    return function () {
      removePortalContainer(container);
    };
  }, [container]);
  return /*#__PURE__*/createPortal(children, container);
}