@types/jsonfile

readFile: {
    (file: Path, options: JFReadOptions, callback: ReadCallback): void;
    (file: any, callback: ReadCallback): void;
    (file: any, options?: JFReadOptions): Promise<any>;
};

readFileSync: (file: Path, options?: JFReadOptions) => any;

writeFile: {
    (file: Path, obj: any, options: JFWriteOptions, callback: WriteCallback): void;
    (file: any, obj: any, callback: WriteCallback): void;
    (file: any, obj: any, options?: JFWriteOptions): Promise<void>;
};

writeFileSync: (file: Path, obj: any, options?: JFWriteOptions) => void;

type JFReadOptions =
    | {
          encoding?: string | null | undefined;
          flag?: string | undefined;
          throws?: boolean | undefined;
          fs?: FS | undefined;
          reviver?: ((key: any, value: any) => any) | undefined;
      }
    | string
    | null
    | undefined;

type JFWriteOptions =
    | {
          encoding?: string | null | undefined;
          mode?: string | number | undefined;
          flag?: string | undefined;
          fs?: FS | undefined;
          EOL?: string | undefined;
          spaces?: string | number | undefined;
          replacer?: ((key: string, value: any) => any) | undefined;
      }
    | string
    | null;

type Path = PathLike | Url;

type ReadCallback = (err: NodeJS.ErrnoException | null, data: any) => void;

type WriteCallback = (err: NodeJS.ErrnoException | null) => void;