export declare const generateKey: () => string;
/**
 * 为列表提供持久索引 (Persistent Index)
 * - idea from https://slides.com/ai/crdt#/85
 */
export declare const usePersistentIndex: () => {
    insert: (targetIndex?: any) => string;
    remove: (targetIndex: any) => void;
    get: (index: any) => string;
    size: number;
};
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