import { Deno } from "https://deno.land/x/deno@v1.28.1/cli/dts/lib.deno.ns.d.ts";
const { fstat } = Deno;
Returns a Deno.FileInfo for the given file stream.
import { assert } from "https://deno.land/std/testing/asserts.ts";
const file = await Deno.open("file.txt", { read: true });
const fileInfo = await Deno.fstat(file.rid);
assert(fileInfo.isFile);