/**
 * Minimal paths object needed for config backup — just the global root
 * from which we derive the backup history directory.
 */
export interface ConfigBackupPaths {
    globalRoot: string;
}
/**
 * Backup directory for config file history.
 * Every config write creates a timestamped snapshot here so the user can
 * recover from accidental changes. Backups are never cleaned up automatically.
 */
export declare function configHistoryDir(globalRoot: string): string;
/**
 * Before overwriting a config file, save its current content to the
 * config-history directory with a timestamp. Best-effort: failures are
 * silently ignored so they never block the config write itself.
 */
export declare function backupConfigFile(filePath: string, paths: ConfigBackupPaths): Promise<void>;
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