class MultipartWriterimport { MultipartWriter } from "https://deno.land/std@0.81.0/mime/mod.ts"; Writer for creating multipart/form-data ConstructorsnewMultipartWriter(writer: Deno.Writer, boundary?: string)Propertiesprivatereadonly_boundary: stringprivatebufWriter: BufWriterprivateisClosed: booleanprivatelastPart: PartWriter | undefinedreadonlyboundary: stringMethodsprivatecreatePart(headers: Headers): Deno.Writerprivateflush(): Promise<void>close(): Promise<void>Close writer. No additional data can be written to stream createFormField(field: string): Deno.WritercreateFormFile(field: string, filename: string): Deno.WriterformDataContentType(): stringwriteField(field: string, value: string): Promise<void>writeFile(field: string,filename: string,file: Deno.Reader,): Promise<void>