/**
 * Token Persistence
 *
 * Handles reading, writing, and backup of token files.
 */
import { type StoredOAuthToken } from '../oauth-token-utils.js';
/**
 * Read and parse token from file
 */
export declare function readTokenFromFile(file: string): Promise<StoredOAuthToken | null>;
/**
 * Backup token file before modification
 */
export declare function backupTokenFile(file: string): Promise<string | null>;
/**
 * Restore token from backup
 */
export declare function restoreTokenFileFromBackup(backupFile: string | null, target: string): Promise<void>;
/**
 * Discard backup file
 */
export declare function discardBackupFile(backupFile: string | null): Promise<void>;