import { BufWriter } from "https://deno.land/x/dejs@0.4.0/vendor/https/deno.land/std/io/bufio.ts";
return new BufWriter unless writer is BufWriter
import { BufWriter } from "https://deno.land/x/dejs@0.4.0/vendor/https/deno.land/std/io/bufio.ts";
return new BufWriter unless writer is BufWriter