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