import type { FirestoreBackendOptions, FirestoreConfig } from "./types.js";
/**
 * Default configuration for Firestore backend.
 * @see docs/specs/firestore-backend.md
 */
export declare const FIRESTORE_DEFAULTS: {
    /** Collection name for lock documents */
    readonly collection: "locks";
    /** Collection name for fencing token counters */
    readonly fenceCollection: "fence_counters";
    /** Cleanup expired locks in isLocked() - disabled for O(1) performance */
    readonly cleanupInIsLocked: false;
};
/**
 * Merges user options with defaults and validates configuration.
 * @param options - User-provided Firestore configuration
 * @returns Complete Firestore backend configuration
 * @throws {LockError} If fenceCollection equals collection (prevents accidental fence counter deletion)
 */
export declare function createFirestoreConfig(options?: FirestoreBackendOptions): FirestoreConfig;