type ScrollerVirtualizer = {
    setScrollOffset: (offset: number) => void;
    getOffsetForIndex: (index: number) => number;
    getSizeForIndex: (index: number) => number;
};
export type JsScrollerConfig = {
    /** The shared virtualizer to drive. */
    virtualizer: ScrollerVirtualizer;
    /** Full scrollable content height (px). */
    totalSize: () => number;
    /** Visible viewport height (px). */
    viewport: () => number;
    /** Row height used to convert line-mode wheel deltas to px. */
    lineStep: () => number;
};
export declare function createJsScroller(cfg: JsScrollerConfig): {
    readonly scrollOffset: number;
    readonly maxOffset: number;
    readonly thumbH: number;
    readonly thumbTop: number;
    readonly dragging: boolean;
    scrollTo: (offset: number) => void;
    scrollByPx: (delta: number) => void;
    ensureVisible: (top: number, h: number) => void;
    ensureIndexVisible: (index: number) => void;
    onWheel: (e: WheelEvent) => void;
    onThumbDown: (e: PointerEvent) => void;
    onThumbMove: (e: PointerEvent) => void;
    onThumbUp: (e: PointerEvent) => void;
    onTrackDown: (e: PointerEvent) => void;
    onContentDown: (e: PointerEvent) => void;
    onContentMove: (e: PointerEvent) => void;
    onContentUp: (e: PointerEvent) => void;
};
export {};