@mui/base/Portal/Portal.types.d.ts

import * as React from 'react';
export interface PortalProps {
    /**
     * The children to render into the `container`.
     */
    children?: React.ReactNode;
    /**
     * An HTML element or function that returns one.
     * The `container` will have the portal children appended to it.
     *
     * You can also provide a callback, which is called in a React layout effect.
     * This lets you set the container from a ref, and also makes server-side rendering possible.
     *
     * By default, it uses the body of the top-level document object,
     * so it's simply `document.body` most of the time.
     */
    container?: Element | (() => Element | null) | null;
    /**
     * The `children` will be under the DOM hierarchy of the parent component.
     * @default false
     */
    disablePortal?: boolean;
}