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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assert, assertEquals } from "./test_util.ts";
// TODO(@kitsonk) remove when we are no longer patching TypeScript to have
// these types available.
Deno.test(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);
});
Deno.test(function objectHasOwn() {
const a = { a: 1 };
assert(Object.hasOwn(a, "a"));
assert(!Object.hasOwn(a, "b"));
});
Deno.test(function errorCause() {
const e = new Error("test", { cause: "something" });
assertEquals(e.cause, "something");
});
Deno.test(function intlListFormat() {
const formatter = new Intl.ListFormat("en", {
style: "long",
type: "conjunction",
});
assertEquals(
formatter.format(["red", "green", "blue"]),
"red, green, and blue",
);
const formatter2 = new Intl.ListFormat("en", {
style: "short",
type: "disjunction",
});
assertEquals(formatter2.formatToParts(["Rust", "golang"]), [
{ type: "element", value: "Rust" },
{ type: "literal", value: " or " },
{ type: "element", value: "golang" },
]);
// Works with iterables as well
assertEquals(
formatter.format(new Set(["red", "green", "blue"])),
"red, green, and blue",
);
assertEquals(formatter2.formatToParts(new Set(["Rust", "golang"])), [
{ type: "element", value: "Rust" },
{ type: "literal", value: " or " },
{ type: "element", value: "golang" },
]);
});
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