Babylon.js/nodeEditor/src/portal.tsx

import * as React from "react";
import { GlobalState } from './globalState';
import * as ReactDOM from 'react-dom';

interface IPortalProps {
    globalState: GlobalState;
}

export class Portal extends React.Component<IPortalProps> {
    render() {
        return ReactDOM.createPortal(
            this.props.children,
            this.props.globalState.hostElement
        );
    }
}