@atlaskit/portal/dist/es2019/internal/utils/create-portal-parent.js

A wrapper for rendering components in React portals.

import { portalParentClassName, portalParentSelector } from '../constants';
import { getBody } from './get-body';
const isDocumentDefined = () => {
  return document !== undefined;
};
export const createPortalParent = () => {
  //atlaskit-portal-container div
  if (isDocumentDefined()) {
    const parentElement = document.querySelector(portalParentSelector);
    if (!parentElement) {
      var _getBody;
      const parent = document.createElement('div');
      parent.className = portalParentClassName;
      parent.style.display = 'flex';
      (_getBody = getBody()) === null || _getBody === void 0 ? void 0 : _getBody.appendChild(parent);
      return parent;
    }
    return parentElement;
  }
  return;
};