index.js

import { registerPlugin } from "@wordpress/plugins";
import { useState, useEffect, createPortal } from "@wordpress/element";

const SomeEditorPlugin = () => {
	const [portalContainer, setPortalContainer] = useState(null);

	useEffect(() => {
		// Wait for the DOM element to be available
		const container = document.querySelector("#some-element");
		setPortalContainer(container);
	}, []);

	if (!portalContainer) {
		return null; // Return null until the container is available
	}

	return createPortal(
		<div>Hey there.</div>,
		portalContainer
	);
};

registerPlugin("some-editor-plugin", {
	render: SomeEditorPlugin,
});