import type { ReactElement } from 'react';
/**
 * Mounts `element` into `mountPoint`.
 *
 * When `nike_r19_render_unmount` is **on**, uses the React 18/19 `createRoot`
 * API wrapped in `flushSync` so the render is synchronous – matching the
 * legacy `ReactDOM.render` timing that ProseMirror decoration widgets depend
 * on (focus management, anchor positioning, block-menu visibility all read
 * the rendered DOM immediately after the callback returns).
 *
 * When the gate is **off**, falls back to the legacy `ReactDOM.render` path.
 */
export declare const renderToMountPoint: (element: ReactElement, mountPoint: Element) => void;
/**
 * Unmounts the React tree at `mountPoint`.
 *
 * When `nike_r19_render_unmount` is **on**, looks up the root in the shared
 * registry, calls `root.unmount()`, and removes the entry.
 *
 * When the gate is **off**, falls back to `ReactDOM.unmountComponentAtNode`.
 */
export declare const unmountFromMountPoint: (mountPoint: Element) => void;