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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals, unitTest } from "./test_util.ts";
// TODO(@kitsonk) remove when we are no longer patching TypeScript to have
// these types available.
unitTest(function typeCheckingEsNextArrayString() {
const a = "abcdef";
assertEquals(a.at(-1), "f");
const b = ["a", "b", "c", "d", "e", "f"];
assertEquals(b.at(-1), "f");
assertEquals(b.findLast((val) => typeof val === "string"), "f");
assertEquals(b.findLastIndex((val) => typeof val === "string"), 5);
});
unitTest(function objectHasOwn() {
const a = { a: 1 };
assert(Object.hasOwn(a, "a"));
assert(!Object.hasOwn(a, "b"));
});
unitTest(function errorCause() {
const e = new Error("test", { cause: "something" });
assertEquals(e.cause, "something");
});
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