Chinese language support

.gitignore

@@ -120,4 +120,7 @@ src/**/*.js*
 dist/**/*.txt
 
 # Local
-example/pi/sdpi-components.js.map
+example/pi/sdpi-components.js.map
+
+# OS
+.DS_Store

src/core/__tests__/i18n.test.ts

@@ -10,36 +10,84 @@ describe("i18n", () => {
 
 	describe("default language", () => {
 		afterAll(() => jest.spyOn(window.navigator, "language", "get").mockReturnValue("en-GB"));
+		afterEach(() => jest.resetModules());
 
-		const testCases = [
-			{
-				name: "should read window.navigator.language when localized",
-				navigator: "es-ES",
-				language: "es",
-			},
-			{
-				name: "should read window.navigator.language when not localized",
-				navigator: "fr",
-				language: "fr",
-			},
-			{
-				name: "should fallback to en when empty",
-				navigator: "",
-				language: "en",
-			},
-		];
-
-		testCases.map((testCase) => {
-			it(testCase.name, async () => {
+		it("should read window.navigator.language when localized", async () => {
+			// given.
+			jest.spyOn(window.navigator, "language", "get").mockReturnValue("es-ES");
+
+			// when
+			const i18n = (await import("../i18n")).default;
+
+			// then.
+			expect(i18n.language).toBe("es");
+		});
+
+		it("should read window.navigator.language when not localized", async () => {
+			// given.
+			jest.spyOn(window.navigator, "language", "get").mockReturnValue("fr");
+
+			// when
+			const i18n = (await import("../i18n")).default;
+
+			// then.
+			expect(i18n.language).toBe("fr");
+		});
+
+		it("should fallback to en when empty", async () => {
+			// given.
+			jest.spyOn(window.navigator, "language", "get").mockReturnValue("");
+
+			// when
+			const i18n = (await import("../i18n")).default;
+
+			// then.
+			expect(i18n.language).toBe("en");
+		});
+
+		describe("Simplified/Traditional Chinese", () => {
+			it("should map traditional Chinese zh-TW to zh_TW", async () => {
+				// given.
+				jest.spyOn(window.navigator, "language", "get").mockReturnValue("zh-TW");
+
+				// when
+				const i18n = (await import("../i18n")).default;
+
+				// then.
+				expect(i18n.language).toBe("zh_TW");
+			});
+
+			it("should map traditional Chinese zh-Hant to zh_TW", async () => {
+				// given.
+				jest.spyOn(window.navigator, "language", "get").mockReturnValue("zh-Hant");
+
+				// when
+				const i18n = (await import("../i18n")).default;
+
+				// then.
+				expect(i18n.language).toBe("zh_TW");
+			});
+
+			it("should map simplified Chinese zh-CN to zh_CN", async () => {
+				// given.
+				jest.spyOn(window.navigator, "language", "get").mockReturnValue("zh-CN");
+
+				// when
+				const i18n = (await import("../i18n")).default;
+
+				// then.
+				expect(i18n.language).toBe("zh_CN");
+			});
+
+			it("should map simplified Chinese zh-Hans to zh_CN", async () => {
 				// given.
-				jest.spyOn(window.navigator, "language", "get").mockReturnValue(testCase.navigator);
+				jest.spyOn(window.navigator, "language", "get").mockReturnValue("zh-Hans");
 
 				// when
 				const i18n = (await import("../i18n")).default;
-				jest.resetModules();
 
 				// then.
-				expect(i18n.language).toBe(testCase.language);
+				expect(i18n.language).toBe("zh_CN");
 			});
 		});
 	});

src/core/i18n.ts

@@ -40,6 +40,18 @@ export class Internationalization {
 	 * {@link https://developer.chrome.com/docs/extensions/reference/i18n/#method-getUILanguage}
 	 */
 	public getUILanguage(): string {
+		const language = window.navigator.language;
+
+		// Chinese Traditional
+		if (language === "zh-Hant" || language === "zh-TW") {
+			return "zh_TW";
+		}
+
+		// Chinese Simplified
+		if (language === "zh-Hans" || language === "zh-CN") {
+			return "zh_CN";
+		}
+
 		return window.navigator.language ? window.navigator.language.split("-")[0] : "en";
 	}
 }