feat: create getLanguage() function, used for testing purposes

src/test.ts

@@ -1,3 +1,5 @@
+import ISO6391, { LanguageCode } from 'iso-639-1';
+import lande from 'lande';
 import { NostrEvent } from '@nostrify/nostrify';
 import { finalizeEvent, generateSecretKey } from 'nostr-tools';
 
@@ -65,3 +67,15 @@ export async function createTestDB() {
 export function sleep(ms: number): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }
+
+export function getLanguage(text: string): LanguageCode | undefined {
+  const [topResult] = lande(text);
+  if (topResult) {
+    const [iso6393] = topResult;
+    const locale = new Intl.Locale(iso6393);
+    if (ISO6391.validate(locale.language)) {
+      return locale.language as LanguageCode;
+    }
+  }
+  return;
+}