import {
  Status,
  STATUS_TEXT,
} from "https://deno.land/std@0.207.0/http/http_status.ts";

console.log(Status.NotFound); //=> 404
console.log(STATUS_TEXT[Status.NotFound]); //=> "Not Found"

import { isErrorStatus } from "https://deno.land/std@0.207.0/http/http_status.ts";

const res = await fetch("https://example.com/");

if (isErrorStatus(res.status)) {
  // error handling here...
}