export declare class FsLogger {
    file: string;
    header: string;
    constructor(file: string, header: string);
    log(data: string): Promise<void>;
}
export declare class FsFlag<Data extends Record<string, any>> {
    file: string;
    constructor(file: string);
    flag(data: Data): Promise<void>;
    unflag(): Promise<void>;
    hasFlag(): Promise<boolean>;
    readFlag(): Promise<Data>;
    flagSync(data: Data): void;
}