export declare const SCROLL_BOTTOM_THRESHOLD = 48;
export declare const SCROLL_SETTLE_MS = 160;
export type ScrollableElement = {
    scrollTop: number;
    readonly scrollHeight: number;
    readonly clientHeight: number;
    addEventListener?: (type: string, listener: () => void, options?: {
        passive?: boolean;
    }) => void;
    removeEventListener?: (type: string, listener: () => void) => void;
};
export type ScrollControllerDeps = {
    container: () => ScrollableElement | undefined | null;
    raf?: (callback: () => void) => void;
    setTimer?: (callback: () => void, ms: number) => unknown;
    clearTimer?: (handle: unknown) => void;
};
export type ScrollController = {
    scrollToBottom: (force?: boolean) => void;
    observe: (element: ScrollableElement) => () => void;
    sync: () => void;
    hasUserScrolledUp: () => boolean;
    dispose: () => void;
};
export declare function isNearBottom(container: ScrollableElement | undefined | null): boolean;
export declare function createScrollController(deps: ScrollControllerDeps): ScrollController;