import { ScrollAlignment, BasicVirtualizerOptions, VirtualItem, Rect } from './typings';
/**
 * 虚拟列表基类
 */
export declare class BasicVirtualizer<TOptions = Record<string, any>> {
    options: TOptions & Required<BasicVirtualizerOptions>;
    items: VirtualItem[];
    scrollElementRect?: Rect;
    scrollOffset?: number;
    scrolling: boolean;
    range?: {
        startIndex: number;
        endIndex: number;
    };
    unsubscribes: Array<void | (() => void)>;
    dynamicSizeCache: Map<number, number>;
    pendingDynamicSizeIndexes: number[];
    setOptions(options: TOptions & BasicVirtualizerOptions): void;
    dynamicMode(): boolean;
    setScrollElementRect(rect: Rect): void;
    /**
     * 获取每条lane的最后一个item 并返回end值最小的那一个
     * @param items
     * @param index
     */
    private getLastItemForLane;
    /**
     * 所有虚拟项数据
     */
    private geItemsWithtMemo;
    getItems(): VirtualItem[];
    private getVirtualItemsWithMemo;
    getVirtualItems(): VirtualItem[];
    private getVirtualIndexesWithMemo;
    getVirtualIndexes(): number[];
    getScrollOffset(): number;
    getSize(): number;
    getTotalSize(): number;
    calculateStartIndex(scrollOffset: number): number;
    private calculateRangeWithMemo;
    private calculateRangeIndex;
    getOffsetForAlign(offset: number, align?: ScrollAlignment, itemSize?: number): number;
    getOffsetForIndex(index: number, align?: ScrollAlignment): number;
    private notifyWithMemo;
    notify(): void;
    /**
     * 清除指定函数的缓存
     * @param names 需要清除缓存的函数名称
     */
    clearFnMemo(names: ('notifyWithMemo' | 'calculateRangeWithMemo' | 'getVirtualItemsWithMemo' | 'getVirtualIndexesWithMemo' | 'geItemsWithtMemo')[]): void;
}
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