import 'https://deno.land/x/corejs@v3.44.0/index.js'; // <- at the top of your entry point

Object.hasOwn({ foo: 42 }, 'foo');   // => true

[1, 2, 3, 4, 5, 6, 7].at(-3);        // => 5

[1, 2, 3, 4, 5].group(it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] }

Promise.any([
  Promise.resolve(1),
  Promise.reject(2),
  Promise.resolve(3),
]).then(console.log);                // => 1

(function * (i) { while (true) yield i++; })(1)
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray();                        // => [9, 25]