public IWebpackFile AddFile(string filename, string contents, string mimeType)
        {
            var result = new WebpackFile(System.Text.Encoding.UTF8.GetBytes(contents), mimeType);

            _files.Add(filename, result);
            return(result);
        }
        public IWebpackFile AddFile(string filename, string contents, string mimeType)
        {
            var result = new WebpackFile(contents, mimeType);

            _files.Add(filename, result);
            return(result);
        }