import { mkdirSync } from "https://deno.land/x/deno@v0.28.0/cli/js/mkdir.ts";
Creates a new directory with the specified path synchronously.
If recursive is set to true, nested directories will be created (also known
as "mkdir -p").
mode sets permission bits (before umask) on UNIX and does nothing on
Windows.
Deno.mkdirSync("new_dir");
Deno.mkdirSync("nested/directories", true);