import { BufWriterSync } from "https://deno.land/std@0.164.0/io/buffer.ts";
return new BufWriterSync unless writer is BufWriterSync
Parameters
writer: WriterSync
import { BufWriterSync } from "https://deno.land/std@0.164.0/io/buffer.ts";
return new BufWriterSync unless writer is BufWriterSync