/**
 * Hash-based index for O(1) lookups (T022)
 *
 * Provides fast key-based lookups using a hash table.
 * Best for exact matches and equality queries.
 */
import type { IIndex, IndexStats, IndexEntry } from './types.js';
export declare class HashIndex implements IIndex {
    readonly name: string;
    readonly type: 'hash';
    private index;
    private unique;
    private caseInsensitive;
    constructor(name: string, options?: {
        unique?: boolean;
        caseInsensitive?: boolean;
    });
    /**
     * Normalize key for case-insensitive comparison
     */
    private normalizeKey;
    /**
     * Insert entry into index
     */
    insert(key: any, path: string, value?: any): void;
    /**
     * Remove entry from index
     */
    remove(key: any, path?: string): boolean;
    /**
     * Find paths by key
     */
    find(key: any): string[];
    /**
     * Check if key exists
     */
    has(key: any): boolean;
    /**
     * Clear all entries
     */
    clear(): void;
    /**
     * Get number of unique keys
     */
    size(): number;
    /**
     * Get index statistics
     */
    stats(): IndexStats;
    /**
     * Get all keys
     */
    keys(): IterableIterator<any>;
    /**
     * Get all entries
     */
    entries(): IterableIterator<IndexEntry>;
}
//# sourceMappingURL=hash-index.d.ts.map