test(examples): add Google audio output repro

Author: cipher416

examples/ai-functions/src/stream-text/google/audio-output.ts

@@ -0,0 +1,51 @@
+import { google, type GoogleLanguageModelOptions } from '@ai-sdk/google';
+import { streamText, type GeneratedAudioFile, type GeneratedFile } from 'ai';
+import { saveAudioFile } from '../../lib/save-audio';
+import { run } from '../../lib/run';
+
+// `streamText` yields generic file parts, so adapt audio files for the helper.
+function toGeneratedAudioFile(file: GeneratedFile): GeneratedAudioFile {
+  if (!file.mediaType.startsWith('audio/')) {
+    throw new Error(`Expected audio file, got ${file.mediaType}`);
+  }
+
+  return {
+    base64: file.base64,
+    uint8Array: file.uint8Array,
+    mediaType: file.mediaType,
+    format:
+      file.mediaType === 'audio/mpeg' ? 'mp3' : file.mediaType.split('/')[1]!,
+  };
+}
+
+run(async () => {
+  const result = streamText({
+    model: google('lyria-3-clip-preview'),
+    prompt:
+      'Generate a short upbeat melody with a gentle synth lead and no spoken words.',
+    providerOptions: {
+      google: {
+        responseModalities: ['AUDIO'],
+      } satisfies GoogleLanguageModelOptions,
+    },
+  });
+
+  for await (const part of result.fullStream) {
+    switch (part.type) {
+      case 'text-delta': {
+        process.stdout.write(part.text);
+        break;
+      }
+
+      case 'file': {
+        console.log(`\nReceived file: ${part.file.mediaType}`);
+
+        if (part.file.mediaType.startsWith('audio/')) {
+          await saveAudioFile(toGeneratedAudioFile(part.file));
+        }
+
+        break;
+      }
+    }
+  }
+});