declare class File<T extends Array<any> | Record<string, any>> {
    private jsonPath;
    private backupPath;
    private saveDir;
    private defaultValue;
    private cacheRead?;
    private timeoutHandle?;
    constructor(filename: string, defaultValue: T, saveDir?: string);
    write(content: T): void;
    read(): T;
    backup(): void;
    restore(): void;
    exist(backup?: boolean): boolean;
    rm(backup?: boolean): void;
}
export default File;