import { BufWriterSync } from "https://deno.land/std@v0.61.0/io/bufio.ts";
return new BufWriterSync unless writer is BufWriterSync
import { BufWriterSync } from "https://deno.land/std@v0.61.0/io/bufio.ts";
return new BufWriterSync unless writer is BufWriterSync