import { ShowtimeBottomSheetSnapPoint, ShowtimeBottomSheetSnapPoints, ShowtimeBottomSheetScrollState, ShowtimeSheetSnap } from './ShowtimeBottomSheet.types';
/**
 * 统一按从低到高的视觉顺序排序，便于后续 clamp 和最近点查找。
 */
export declare function sortSnapPoints(snapPoints: ShowtimeBottomSheetSnapPoint[]): ShowtimeBottomSheetSnapPoint[];
/**
 * 补齐外部传入的 snapPoints，保证内部始终拿到完整的数组结构。
 */
export declare function normalizeSnapPoints(snapPoints?: ShowtimeBottomSheetSnapPoints): ShowtimeBottomSheetSnapPoint[];
/**
 * 按 key 查找吸附点，给组件层统一做外部 snap 到内部位置的映射。
 */
export declare function findSnapPointByKey(snapPoints: ShowtimeBottomSheetSnapPoint[], key: ShowtimeSheetSnap): ShowtimeBottomSheetSnapPoint | undefined;
/**
 * 根据当前位置找到最近的吸附点。
 */
export declare function findNearestSnapPoint(y: number, snapPoints: ShowtimeBottomSheetSnapPoint[]): ShowtimeBottomSheetSnapPoint;
/**
 * 将视觉位置限制在最低和最高吸附点之间。
 */
export declare function clampVisualY(y: number, snapPoints: ShowtimeBottomSheetSnapPoint[]): number;
/**
 * 根据当前基准位置和位移，推导松手时的投影位置。
 */
export declare function resolveProjectedPosition(input: {
    basePosition: number;
    offsetPx: number;
    viewportHeight: number;
    snapPoints: ShowtimeBottomSheetSnapPoint[];
}): number;
/**
 * 读取内容区是否已经滚动到顶/到底。
 * 非滚动容器也会返回明确状态，避免外部重复写空值判断。
 */
export declare function readContentScrollState(element?: HTMLElement | null): ShowtimeBottomSheetScrollState;
export declare function resolveScrollableContentElement(element?: HTMLElement | null, boundary?: HTMLElement | null): HTMLElement | null;
/**
 * Motion 使用字符串 `vh` 值，这里统一做保留两位的小数格式化。
 */
export declare function formatVh(value: number): string;