/**
 * BackupManager provides safety and rollback capabilities for file modifications.
 * Creates .bak files before modifications and supports restoration.
 */
export declare class BackupManager {
    /**
     * Creates a backup of the specified file with .bak extension.
     * Preserves file permissions from the original file.
     * @param filePath - Path to the file to backup
     * @returns Promise resolving to the backup file path
     */
    createBackup(filePath: string): Promise<string>;
    /**
     * Restores a file from its backup.
     * @param filePath - Path to the file to restore (backup must exist at filePath.bak)
     */
    restoreFromBackup(filePath: string): Promise<void>;
    /**
     * Lists all backup files for a given file path.
     * @param filePath - Base file path to search for backups
     * @returns Array of backup file names (not full paths)
     */
    listBackups(filePath: string): Promise<string[]>;
    /**
     * Cleans up old backups, keeping only the most recent N.
     * @param filePath - Base file path
     * @param keepCount - Number of recent backups to keep (default: 3)
     */
    cleanupOldBackups(filePath: string, keepCount?: number): Promise<void>;
    /**
     * Restores a file from a specific backup file.
     * Validates and sanitizes backupName to prevent path traversal attacks.
     * @param filePath - Path to the file to restore
     * @param backupName - Name of the backup file (not full path)
     * @throws Error if backupName contains path traversal attempts
     */
    restoreFromSpecificBackup(filePath: string, backupName: string): Promise<void>;
}
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