export declare class FileStorageHelper {
    static list: (filePath: string) => Promise<string[]>;
    static move: (oldKey: string, newKey: string) => Promise<void>;
    static store: (key: string, contentType: string, contents: Buffer) => Promise<void>;
    static remove: (key: string) => Promise<void>;
    static removeFolder: (key: string) => Promise<void>;
}
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