declare module "heic-convert" {
  type ConvertOptions = {
    buffer: Buffer | ArrayBuffer | Uint8Array;
    format: "JPEG" | "PNG";
    quality?: number;
  };

  type ConvertAllOptions = ConvertOptions;

  type ConvertibleImage = {
    convert: () => Promise<ArrayBuffer | Uint8Array | Buffer>;
  };

  function convert(
    options: ConvertOptions
  ): Promise<ArrayBuffer | Uint8Array | Buffer>;

  namespace convert {
    function all(options: ConvertAllOptions): Promise<ConvertibleImage[]>;
  }

  export = convert;
}