/**
 * Compound Index for Multi-Field Indexing (T024)
 *
 * Supports indexing on multiple fields simultaneously
 */
import type { IIndex, IndexStats, IndexEntry } from './types.js';
/**
 * Compound Index wraps Hash or BTree index with multi-field support
 */
export declare class CompoundIndex implements IIndex {
    readonly name: string;
    readonly type: 'hash' | 'btree';
    private index;
    private fields;
    constructor(name: string, fields: string[], options?: {
        type?: 'hash' | 'btree';
        unique?: boolean;
    });
    /**
     * Insert with compound key
     * @param key - Array of values corresponding to fields
     */
    insert(key: any, path: string, value?: any): void;
    /**
     * Remove with compound key
     */
    remove(key: any, path?: string): boolean;
    /**
     * Find with compound key
     */
    find(key: any): string[];
    /**
     * Check if compound key exists
     */
    has(key: any): boolean;
    /**
     * Range query (only for btree)
     */
    range(start: any, end: any): string[];
    clear(): void;
    size(): number;
    stats(): IndexStats;
    keys(): IterableIterator<any>;
    entries(): IterableIterator<IndexEntry>;
    /**
     * Get indexed fields
     */
    getFields(): string[];
}
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