import { BufWriter } from "https://dotland.deno.dev/x/abc@v1.2.4/vendor/https/deno.land/std/io/bufio.ts";
return new BufWriter unless writer is BufWriter
import { BufWriter } from "https://dotland.deno.dev/x/abc@v1.2.4/vendor/https/deno.land/std/io/bufio.ts";
return new BufWriter unless writer is BufWriter