refactor: split files (#28)

Separate the source files to improve readability.

src/api.ts

@@ -0,0 +1,74 @@
+import { NativeModules, Platform } from 'react-native';
+
+const LINKING_ERROR =
+  `The package 'react-native-localization-settings' doesn't seem to be linked. Make sure: \n\n` +
+  Platform.select({ ios: "- You have run 'pod install'\n", default: '' }) +
+  '- You rebuilt the app after installing the package\n' +
+  '- You are not using Expo Go\n';
+
+// @ts-expect-error
+const isTurboModuleEnabled = global.__turboModuleProxy != null;
+
+const LocalizationSettingsModule = isTurboModuleEnabled
+  ? require('./NativeLocalizationSettings').default
+  : NativeModules.LocalizationSettings;
+
+const LocalizationSettings = LocalizationSettingsModule
+  ? LocalizationSettingsModule
+  : new Proxy(
+      {},
+      {
+        get() {
+          throw new Error(LINKING_ERROR);
+        },
+      }
+    );
+
+/**
+ * Get language (sync)
+ * @returns Language in IETF BCP 47 format (like 'en-US')
+ * @example
+ * console.log(getLanguage())
+ */
+export function getLanguage(): string {
+  return LocalizationSettings.getConstants().language.split('_')[0];
+}
+
+/**
+ * Get language (async)
+ * @param fallback - fallback language
+ * @returns Promise with Language in IETF BCP 47 format (like 'en-US')
+ * @example
+ * getLanguageAsync().then(console.log)
+ */
+export function getLanguageAsync(fallback?: string): Promise<string> {
+  return LocalizationSettings.getLanguage()
+    .then((res: string) => res.split('_'))
+    .then((res: string[]) => {
+      if (res[0]) {
+        return res[0];
+      }
+      if (fallback) {
+        return fallback;
+      }
+      throw new Error('Invalid language format');
+    });
+}
+
+/**
+ * Set language
+ * @param language - locale string
+ * @example
+ * Usage:
+ * setLanguage('en-US')
+ *
+ * Preferred format:
+ * IETF BCP 47 format - "en-US"
+ *
+ * Other:
+ * ISO 639-1 format - "en"
+ *
+ */
+export function setLanguage(language: string): void {
+  LocalizationSettings.setLanguage(language);
+}

src/index.tsx

@@ -1,98 +1,2 @@
-import { NativeModules, Platform } from 'react-native';
-
-const LINKING_ERROR =
-  `The package 'react-native-localization-settings' doesn't seem to be linked. Make sure: \n\n` +
-  Platform.select({ ios: "- You have run 'pod install'\n", default: '' }) +
-  '- You rebuilt the app after installing the package\n' +
-  '- You are not using Expo Go\n';
-
-// @ts-expect-error
-const isTurboModuleEnabled = global.__turboModuleProxy != null;
-
-const LocalizationSettingsModule = isTurboModuleEnabled
-  ? require('./NativeLocalizationSettings').default
-  : NativeModules.LocalizationSettings;
-
-const LocalizationSettings = LocalizationSettingsModule
-  ? LocalizationSettingsModule
-  : new Proxy(
-      {},
-      {
-        get() {
-          throw new Error(LINKING_ERROR);
-        },
-      }
-    );
-
-/**
- * Get language (sync)
- * @returns Language in IETF BCP 47 format (like 'en-US')
- * @example
- * console.log(getLanguage())
- */
-export function getLanguage(): string {
-  return LocalizationSettings.getConstants().language.split('_')[0];
-}
-
-/**
- * Get language (async)
- * @param fallback - fallback language
- * @returns Promise with Language in IETF BCP 47 format (like 'en-US')
- * @example
- * getLanguageAsync().then(console.log)
- */
-export function getLanguageAsync(fallback?: string): Promise<string> {
-  return LocalizationSettings.getLanguage()
-    .then((res: string) => res.split('_'))
-    .then((res: string[]) => {
-      if (res[0]) {
-        return res[0];
-      }
-      if (fallback) {
-        return fallback;
-      }
-      throw new Error('Invalid language format');
-    });
-}
-
-/**
- * Set language
- * @param language - locale string
- * @example
- * Usage:
- * setLanguage('en-US')
- *
- * Preferred format:
- * IETF BCP 47 format - "en-US"
- *
- * Other:
- * ISO 639-1 format - "en"
- *
- */
-export function setLanguage(language: string): void {
-  LocalizationSettings.setLanguage(language);
-}
-
-/**
- * i18next language detector
- * @example
- * Usage:
- * i18next
- *   .use(ReactNativeLanguageDetector)
- *   .init({
- *     ...
- *   });
- */
-export const ReactNativeLanguageDetector: I18nLanguageDetectorModule = {
-  type: 'languageDetector',
-  init: () => {},
-  detect: () => getLanguage(),
-  cacheUserLanguage: (lng: string) => setLanguage(lng),
-};
-
-interface I18nLanguageDetectorModule {
-  type: 'languageDetector';
-  init?(): void;
-  detect(): string | readonly string[] | undefined;
-  cacheUserLanguage?(lng: string): void;
-}
+export * from './api';
+export * from './languageDetector';

src/languageDetector.ts

@@ -0,0 +1,25 @@
+import { getLanguage, setLanguage } from './api';
+
+/**
+ * i18next language detector
+ * @example
+ * Usage:
+ * i18next
+ *   .use(ReactNativeLanguageDetector)
+ *   .init({
+ *     ...
+ *   });
+ */
+export const ReactNativeLanguageDetector: I18nLanguageDetectorModule = {
+  type: 'languageDetector',
+  init: () => {},
+  detect: () => getLanguage(),
+  cacheUserLanguage: (lng: string) => setLanguage(lng),
+};
+
+interface I18nLanguageDetectorModule {
+  type: 'languageDetector';
+  init?(): void;
+  detect(): string | readonly string[] | undefined;
+  cacheUserLanguage?(lng: string): void;
+}