feat(toolbox): add timezone and noop (#120)

Author: lowlighter

toolbox/noop.ts

@@ -0,0 +1,2 @@
+/** No operation. */
+export function noop(): void {}

toolbox/noop_test.ts

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+import { expect, test } from "@libs/testing"
+import { noop } from "./noop.ts"
+
+test("`noop()` does nothing", () => expect(noop()).toBeUndefined())

toolbox/timezone.ts

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+/** Supported timezones in the current runtime. */
+export const timezones = [...Intl.supportedValuesOf("timeZone"), "UTC"] as string[]
+
+/** Current timezone in the runtime. */
+export const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone as string

toolbox/timezone_test.ts

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+// Copyright (c) - 2025+ the lowlighter/esquie authors. AGPL-3.0-or-later
+import { expect, test } from "@libs/testing"
+import { timezone, timezones } from "./timezone.ts"
+
+test("`timezones` contains supported timezones", () => {
+  expect(timezones.length).toBeGreaterThan(0)
+  expect(timezones).toContain("Europe/Paris")
+  expect(timezones).not.toContain("Invalid/Timezone")
+})
+
+test("`timezone` is defined", () => {
+  expect(timezone).toBeType("string")
+})