/**
 * Utility helper functions
 */
/**
 * Format phone number to JID format
 * @param phoneNumber - Phone number with country code (e.g., "6281234567890")
 * @returns JID string (e.g., "6281234567890@s.whatsapp.net")
 */
export declare function formatPhoneNumber(phoneNumber: string): string;
/**
 * Format group JID
 * @param groupId - Group ID
 * @returns Group JID string
 */
export declare function formatGroupJid(groupId: string): string;
/**
 * Extract phone number from JID
 * @param jid - JID string
 * @returns Phone number
 */
export declare function extractPhoneNumber(jid: string): string;
/**
 * Check if JID is a group
 * @param jid - JID string
 * @returns true if group, false otherwise
 */
export declare function isGroup(jid: string): boolean;
/**
 * Check if JID is a status/broadcast
 * @param jid - JID string
 * @returns true if status, false otherwise
 */
export declare function isStatus(jid: string): boolean;
/**
 * Delay/sleep function
 * @param ms - Milliseconds to delay
 */
export declare function sleep(ms: number): Promise<void>;
/**
 * Retry a function with exponential backoff
 * @param fn - Function to retry
 * @param maxRetries - Maximum number of retries
 * @param baseDelay - Base delay in milliseconds
 */
export declare function retryWithBackoff<T>(fn: () => Promise<T>, maxRetries?: number, baseDelay?: number): Promise<T>;
/**
 * Validate session ID
 * @param sessionId - Session ID to validate
 * @returns true if valid, false otherwise
 */
export declare function isValidSessionId(sessionId: string): boolean;
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