type ClientRectSource = {
    getBoundingClientRect?: () => {
        top: number;
    };
};
type ThreadPositionEntry = {
    bounds?: {
        top?: number;
    } | null;
} | null | undefined;
type ThreadAnchorPresentation = {
    getReachableThreadAnchorClientY: (threadId: string, targetClientY: number) => number | null | undefined;
    scrollThreadAnchorToClientY: (threadId: string, targetClientY: number, options: {
        behavior: ScrollBehavior;
    }) => boolean | null | undefined;
};
export declare const getPreferredCommentFocusTargetClientY: () => number;
export declare const getVisibleThreadAnchorClientY: (layersElement: ClientRectSource | null | undefined, positionEntry: ThreadPositionEntry) => number | null;
export declare const getVisibleThreadHighlightClientY: (threadIds: ReadonlyArray<string | number | null | undefined> | null | undefined) => number | null;
export declare const scrollThreadAnchorToFocusTarget: (presentation: ThreadAnchorPresentation | null | undefined, primaryThreadId: string | null | undefined, fallbackThreadId: string | null | undefined, targetClientY: number | null | undefined) => number | null;
export {};