import type { Ref } from 'vue';
interface ScrollMetrics {
    scrollTop: number;
    scrollHeight: number;
    clientHeight: number;
}
interface ScrollSnapshot {
    scrollTop: number;
    scrollHeight: number;
}
/**
 * Only the user changes the pinned state: moving up detaches, moving down into
 * the bottom zone reattaches. Layout changes that shift the bottom under a
 * stationary viewport leave the state untouched. A position drop that comes
 * with a shorter document is the browser clamping after content shrank, not the
 * user reading upwards, so it keeps whatever state was in place.
 */
export declare function resolvePinnedAfterScroll(pinned: boolean, previous: ScrollSnapshot, { scrollTop, scrollHeight, clientHeight }: ScrollMetrics, threshold: number): boolean;
export declare function useStickToBottom(scrollRoot: Ref<HTMLElement | null>, contentRoot: Ref<HTMLElement | null>): {
    bottomPinned: Ref<boolean, boolean>;
    hasRoomBelow: Ref<boolean, boolean>;
    detach: () => void;
    scheduleScrollToBottom: () => void;
    scrollToBottom: (options?: {
        smooth?: boolean;
    }) => void;
};
export {};