import { Component, type ReactNode } from "react";
type Anchor = {
    element: HTMLElement;
    key: string | null;
    text: string | null;
    top: number;
    focused?: boolean;
};
export type TimelineAnchor = Anchor[];
/** Read ownership synchronously: selectionchange may follow the next React commit. */
export declare function timelineHasReader(scroller: HTMLElement | null): boolean;
/** Read the old DOM immediately before React changes it, not when a fetch starts. */
export declare class TimelineBeforeLayout extends Component<{
    capture: () => void;
    children: ReactNode;
}> {
    getSnapshotBeforeUpdate(): null;
    componentDidUpdate(): void;
    render(): ReactNode;
}
export declare function captureTimelineAnchor(scroller: HTMLElement): TimelineAnchor | null;
/** Return only the correction native browser anchoring has not already made. */
export declare function timelineAnchorCorrection(scroller: HTMLElement, anchors: TimelineAnchor): number | null;
export {};