// Copyright 2018-2026 the Deno authors. MIT license.
import { 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 b = ["a", "b", "c", "d", "e", "f"];
  assertEquals(b.findLast((val) => typeof val === "string"), "f");
  assertEquals(b.findLastIndex((val) => typeof val === "string"), 5);
});

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" },
  ]);
});

Deno.test(function setUnion() {
  const a = new Set([1, 2, 3]);
  const b = new Set([3, 4, 5]);
  const union = a.union(b);
  assertEquals(union, new Set([1, 2, 3, 4, 5]));
});

Deno.test(function float16Array() {
  const myNums = Float16Array.from([11.25, 2, -22.5, 1]);
  const sorted = myNums.toSorted((a, b) => a - b);
  assertEquals(sorted[0], -22.5);
  assertEquals(sorted[1], 1);
  assertEquals(sorted[2], 2);
  assertEquals(sorted[3], 11.25);
});

Deno.test(function mathSumPrecise() {
  assertEquals(Math.sumPrecise([1, 2, 3]), 6);
  assertEquals(Math.sumPrecise([]), -0);
  // Avoids the accumulated rounding error from naive `+` reduction:
  // `0.1 + 0.2 + 0.3` is `0.6000000000000001`.
  assertEquals(Math.sumPrecise([0.1, 0.2, 0.3]), 0.6);
  // Accepts arbitrary iterables.
  function* gen() {
    yield 1.5;
    yield 2.5;
    yield 3.5;
  }
  assertEquals(Math.sumPrecise(gen()), 7.5);
});

Deno.test(function intlLocaleVariants() {
  const variants: string | undefined =
    new Intl.Locale("de-DE-1996-fonipa").variants;
  assertEquals(variants, "1996-fonipa");
  assertEquals(new Intl.Locale("en-US").variants, undefined);
});
