/**
 * AutoExtensionManager - Unified auto-extension logic for locks
 * Eliminates duplication between Lock and InternalRedlockLock classes
 */
import { EventEmitter } from "events";
export interface AutoExtensionConfig {
    /** Time-to-live for the lock in milliseconds */
    ttl: number;
    /** Threshold in milliseconds before expiration to trigger extension */
    autoExtendThreshold: number;
    /** Current expiration timestamp */
    expiration: number;
    /** Whether the lock is still valid */
    isValid: () => boolean;
    /** Function to extend the lock */
    extend: (ttl: number) => Promise<{
        success: boolean;
        expiration: number;
    }>;
    /** Optional error handler */
    onError?: (error: Error) => void;
}
export interface AutoExtensionSignal extends EventEmitter {
    aborted: boolean;
    error?: Error;
    expiration: number;
    abort(error?: Error): void;
    addEventListener(type: "abort", listener: () => void): void;
    removeEventListener(type: "abort", listener: () => void): void;
}
/**
 * Manages automatic lock extension with configurable thresholds
 */
export declare class AutoExtensionManager {
    private config;
    private extensionTimer?;
    private extensionPromise?;
    private signal?;
    private _expiration;
    private _extensions;
    private _stopped;
    constructor(config: AutoExtensionConfig);
    /**
     * Get current expiration timestamp
     */
    get expiration(): number;
    /**
     * Get number of successful extensions
     */
    get extensions(): number;
    /**
     * Get time until expiration in milliseconds
     */
    get timeToExpiration(): number;
    /**
     * Start auto-extension cycle
     */
    start(): AutoExtensionSignal;
    /**
     * Stop auto-extension cycle
     */
    stop(): Promise<void>;
    /**
     * Schedule the next extension check
     */
    private scheduleNextExtension;
    /**
     * Perform lock extension
     */
    private performExtension;
    /**
     * Update expiration (for manual extensions)
     */
    updateExpiration(expiration: number): void;
}
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