Minimal sufficient Portal implementation for react.js

Portal.tsx

"use client";

import { createPortal } from "react-dom";

const getContainer = (container: TPortalProps["container"]) => {
  return typeof container === "function" ? container() : container;
};

type TPortalProps = React.PropsWithChildren<{
  container?: Element | (() => Element | null) | null;
}>;

export const Portal: React.FC<TPortalProps> = ({ children, container }) => {
  const moundNode = getContainer(container);
  return createPortal(children, moundNode ?? document.body);
};