class MultipartWriterimport { MultipartWriter } from "https://dotland.deno.dev/std@0.116.0/mime/multipart.ts"; Writer for creating multipart/form-data ConstructorsnewMultipartWriter(writer: Deno.Writer, boundary?: string)Propertiesprivatereadonly_boundary: stringprivatebufWriter: BufWriterprivateisClosed: booleanprivatelastPart: PartWriter | undefinedreadonlyboundary: stringMethodsprivateflush()close()Close writer. No additional data can be written to stream createFormField(field: string): Deno.WritercreateFormFile(field: string, filename: string): Deno.WritercreatePart(headers: Headers): Deno.WriterformDataContentType(): stringwriteField(field: string, value: string)writeFile(field: string,filename: string,file: Deno.Reader,)