export declare const BACKUP_META = ".badmfck-backup.json";
export declare const MAX_BACKUPS = 10;
export type TBackupSlot = "blue" | "green" | null;
export interface IBackupMeta {
    version: 1;
    project: string;
    slot: TBackupSlot;
    createdAt: number;
    user: string;
    reason: "deploy" | "pre-restore";
    appVersion: string | null;
}
export interface IBackupInfo extends IBackupMeta {
    name: string;
    sizeKb: number | null;
}
export declare class BackupManager {
    static fileSafe(s: string): string;
    static stamp(d?: Date): string;
    static isValidName(name: string): boolean;
    private static hasContent;
    private static readMeta;
    private static readAppVersion;
    private static assertSafeRoot;
    static create(target: string, project: string, slot: TBackupSlot, user: string, reason: IBackupMeta["reason"]): Promise<string | null>;
    static list(root: string, project: string, withSize?: boolean): Promise<IBackupInfo[]>;
    static prune(root: string, project: string, keep?: number, protect?: string[]): Promise<string[]>;
    static resolve(root: string, project: string, name: string): {
        dir: string;
        meta: IBackupMeta;
    } | null;
    static restoreInto(backupDir: string, target: string): Promise<void>;
}