/**
 * Session Takeover — Decentralized Lua CAS
 *
 * When a pod dies, surviving pods race to claim orphaned sessions.
 * The Lua script atomically checks and updates the nodeId (compare-and-swap),
 * ensuring exactly-once ownership transfer with no leader election.
 */
import type { TakeoverResult } from './ha.types';
/**
 * Minimal Redis client interface for Lua script execution.
 */
export interface TakeoverRedisClient {
    eval(script: string, numkeys: number, ...args: (string | number)[]): Promise<unknown>;
}
/**
 * Attempt to claim an orphaned session via atomic Lua CAS.
 *
 * Multiple pods may call this concurrently for the same session.
 * Exactly one will succeed (return claimed=true), others get claimed=false.
 *
 * @param redis - Redis client supporting eval
 * @param sessionKey - Full Redis key for the session
 * @param expectedOldNodeId - The dead pod's nodeId (from StoredSession)
 * @param newNodeId - This pod's nodeId (getMachineId())
 * @returns Whether this pod successfully claimed the session
 */
export declare function attemptSessionTakeover(redis: TakeoverRedisClient, sessionKey: string, expectedOldNodeId: string, newNodeId: string): Promise<TakeoverResult>;
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