@base-ui/react/esm/internals/shadowDom.d.ts

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

export declare function activeElement(doc: Document): Element | null;
export declare function contains(parent?: Element | null, child?: Element | null): boolean;
export declare function getTarget(event: Event): EventTarget | null;