import type Redis from 'ioredis';
export declare const DEFAULT_LOCK_PREFIX = "authz:lock:";
export declare const DEFAULT_LOCK_TTL_SEC = 10;
export declare const DEFAULT_BACKOFF_MS: number[];
export declare class DistributedLock {
    private readonly redis;
    private readonly prefix;
    constructor(redis: Redis, prefix?: string);
    /** SET key owner EX ttl NX → true if acquired. */
    acquire(key: string, owner: string, ttlSec?: number): Promise<boolean>;
    /** Release only if still owned (compare-and-delete, avoids deleting a re-acquired lock). */
    release(key: string, owner: string): Promise<void>;
    /**
     * Lock loser path: poll `read` with backoff, returning the first non-null result.
     * Returns null if all attempts are exhausted (→ caller falls back to a direct build).
     */
    pollForResult<T>(read: () => Promise<T | null>, backoffMs?: number[]): Promise<T | null>;
}
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