import { Deno } from "https://deno.land/x/ayonli_jsext@v0.9.72/lib.deno.d.ts";
const { FsFile } = Deno;
Close the file. Closing a file when you are finished with it is important to avoid leaking resources.
using file = await Deno.open("my_file.txt");
// do work with "file" object