class MultipartWriterDeprecatedDeprecatedUse FormData instead. See https://doc.deno.land/deno/stable/~/FormData and https://developer.mozilla.org/en-US/docs/Web/API/FormData for more details. Writer for creating multipart/form-data import { MultipartWriter } from "https://deno.land/std@0.135.0/mime/mod.ts"; 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,)