/** Wait bound, not a lease: a slow or crashed owner is never silently replaced. */
export declare const DEFAULT_MEMORY_LOCK_TIMEOUT_MS = 10000;
export declare function validateMemoryLockTimeout(timeoutMs: number): void;
/**
 * Local-filesystem exclusion for cooperating processes. Atomic rename of the
 * index alone cannot serialize the index/content read-modify-write transaction.
 * An abandoned lock fails closed; guessing a lease expired would permit two
 * live writers to overwrite each other again.
 */
export declare function acquireMemoryOperationLock(path: string, timeoutMs: number): Promise<() => Promise<void>>;
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