/**
 * Hash storage: redis_hashes + coordination with redis_keys.
 * Empty hash removes the key (Section 8.6).
 * Per-field TTL is tracked in redis_hash_field_ttl (epoch milliseconds);
 * HSET clears a field's TTL, lazy-expiration prunes stale fields.
 */
import type Database from './driver.ts';
import type { KeyMeta, KeysStorage } from './keys.ts';
export interface HashWriteOptions {
    updatedAt?: number;
    existingMeta?: KeyMeta | null;
}
export declare function createHashesStorage(db: Database, keys: KeysStorage, options?: {
    clock?: () => number;
}): {
    get(key: Buffer, field: Buffer): Buffer | null;
    getAll(key: Buffer): Buffer[];
    getAllWithMeta: (key: Buffer) => {
        values: Buffer[];
        hasFieldTtl: boolean;
    };
    scan(key: Buffer, limit: number, offset: number): Buffer[];
    set(key: Buffer, field: Buffer, value: Buffer, options?: HashWriteOptions): number;
    setMultiple(key: Buffer, pairs: Buffer[], options?: HashWriteOptions): number;
    setIfAbsent(key: Buffer, field: Buffer, value: Buffer, options?: HashWriteOptions): number;
    delete(key: Buffer, fields: Buffer[], options?: HashWriteOptions): number;
    count(key: Buffer, options?: HashWriteOptions): number;
    incr(key: Buffer, field: Buffer, delta: number, options?: HashWriteOptions): number;
    incrFloat(key: Buffer, field: Buffer, delta: number, options?: HashWriteOptions): Buffer;
    /**
     * Per-field expiration set. Returns -2/0/1/2 per HEXPIRE spec.
     * `condition` is null or one of 'NX','XX','GT','LT'.
     */
    setFieldExpire(key: Buffer, field: Buffer, expiresAtMs: number, { condition }?: {
        condition?: 'NX' | 'XX' | 'GT' | 'LT' | null;
    }): number;
    /**
     * Returns remaining ms plus whether lazy expiration mutated the hash.
     */
    getFieldTtl(key: Buffer, field: Buffer): {
        value: number;
        expired: boolean;
    };
    /**
     * Returns absolute expiry plus whether lazy expiration mutated the hash.
     */
    getFieldExpireAt(key: Buffer, field: Buffer): {
        value: number;
        expired: boolean;
    };
    /**
     * Clears a field's TTL. Returns 1 if cleared, -1 if no TTL, -2 if field missing.
     */
    persistField(key: Buffer, field: Buffer): number;
    /** Copy all field/value rows from oldKey to newKey. Caller ensures newKey exists in redis_keys. */
    copyKey(oldKey: Buffer, newKey: Buffer): void;
};
export type HashesStorage = ReturnType<typeof createHashesStorage>;