first commit

packages/i18n/test/format.test.ts

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+import { test, expect } from "bun:test";
+import {
+  formatNumber,
+  formatCurrency,
+  formatDate,
+  formatRelativeTime,
+  plural,
+} from "../src/index.ts";
+
+test("formatNumber is locale-aware", () => {
+  expect(formatNumber(1234.5, "en-US")).toBe("1,234.5");
+  expect(formatNumber(1234.5, "de-DE")).toBe("1.234,5");
+});
+
+test("formatCurrency", () => {
+  expect(formatCurrency(9.99, "USD", "en-US")).toBe("$9.99");
+});
+
+test("formatDate", () => {
+  const out = formatDate("2026-01-15T00:00:00Z", "en-US", { dateStyle: "medium", timeZone: "UTC" });
+  expect(out).toContain("2026");
+  expect(out).toContain("Jan");
+});
+
+test("formatRelativeTime", () => {
+  expect(formatRelativeTime(-1, "day", "en-US")).toBe("yesterday");
+  expect(formatRelativeTime(3, "hour", "en-US")).toBe("in 3 hours");
+});
+
+test("plural picks the CLDR form and fills #", () => {
+  const forms = { one: "# item", other: "# items" };
+  expect(plural(1, forms, "en")).toBe("1 item");
+  expect(plural(5, forms, "en")).toBe("5 items");
+  expect(plural(0, forms, "en")).toBe("0 items");
+});

packages/i18n/test/i18n.test.ts

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+import { test, expect } from "bun:test";
+import { resolveI18n, makeT, resolveLang, translateHtml } from "../src/index.ts";
+
+const i18n = resolveI18n(
+  {
+    en: { hi: "Hi {name}", nav: { home: "Home" }, ph: "Email" },
+    es: { hi: "Hola {name}", nav: { home: "Inicio" } },
+  },
+  { default: "en" },
+);
+
+test("makeT interpolates params and nested keys", () => {
+  const t = makeT(i18n, "es");
+  expect(t("hi", { name: "Ana" })).toBe("Hola Ana");
+  expect(t("nav.home")).toBe("Inicio");
+});
+
+test("makeT falls back to default language, then the key", () => {
+  const t = makeT(i18n, "es");
+  expect(t("ph")).toBe("Email"); // missing in es → en
+  expect(t("nope")).toBe("nope"); // missing everywhere → key
+});
+
+test("resolveLang: cookie → Accept-Language → default", () => {
+  expect(resolveLang(i18n, "es", null)).toBe("es");
+  expect(resolveLang(i18n, undefined, "fr,es;q=0.8")).toBe("es");
+  expect(resolveLang(i18n, "xx", "de")).toBe("en"); // invalid cookie + unsupported header
+});
+
+test("translateHtml resolves data-t text and t:attr attributes", () => {
+  const t = makeT(i18n, "en");
+  const out = translateHtml('<input t:placeholder="ph"><span data-t="nav.home"></span>', t);
+  expect(out).toContain('placeholder="Email"');
+  expect(out).toContain('<span data-t="nav.home">Home</span>');
+});
+
+test("translateHtml is a no-op without markers", () => {
+  const t = makeT(i18n, "en");
+  expect(translateHtml("<p>plain</p>", t)).toBe("<p>plain</p>");
+});