fix(expo): ask for an audio library only when neither expo-audio nor expo-av is installed

package/expo-package/src/optionalDependencies/AudioVideo.ts

@@ -9,10 +9,4 @@ try {
   // do nothing
 }
 
-if (!AudioComponent) {
-  console.log(
-    'The audio library is currently not installed. To allow in-app audio playback, install the "expo-av" package.',
-  );
-}
-
 export { AudioComponent, RecordingObject };

package/expo-package/src/optionalDependencies/Sound.ts

@@ -13,6 +13,13 @@ try {
   // do nothing
 }
 
+// Playback and recording use expo-audio, or the deprecated expo-av when only that is installed.
+if (!ExpoAudioComponent && !AudioComponent) {
+  console.log(
+    'The audio library is currently not installed. To allow in-app audio playback and voice recording, install the "expo-audio" package.',
+  );
+}
+
 export const Sound = {
   // Always try to prioritize expo-audio if it's there.
   initializeSound: ExpoAudioComponent

package/expo-package/src/optionalDependencies/__tests__/Sound.test.ts

@@ -0,0 +1,48 @@
+// A missing module is a mock whose factory throws, as `require` does for a package that isn't installed.
+const mockOptionalModule = (name: string, exports?: object) =>
+  jest.doMock(
+    name,
+    () => {
+      if (!exports) {
+        throw new Error(`Cannot find module '${name}'`);
+      }
+      return exports;
+    },
+    { virtual: true },
+  );
+
+const audioLibraryLogsOnLoad = () => {
+  const log = jest.spyOn(console, 'log').mockImplementation(() => undefined);
+  require('../Sound');
+  return log.mock.calls
+    .flat()
+    .filter((message) => typeof message === 'string' && message.includes('audio library'));
+};
+
+describe('expo Sound', () => {
+  afterEach(() => {
+    jest.resetModules();
+    jest.restoreAllMocks();
+  });
+
+  it('asks for no audio library when only expo-audio is installed', () => {
+    mockOptionalModule('expo-audio', { AudioModule: {}, createAudioPlayer: jest.fn() });
+    mockOptionalModule('expo-av');
+
+    expect(audioLibraryLogsOnLoad()).toEqual([]);
+  });
+
+  it('asks for no audio library when only expo-av is installed', () => {
+    mockOptionalModule('expo-audio');
+    mockOptionalModule('expo-av', { Audio: {} });
+
+    expect(audioLibraryLogsOnLoad()).toEqual([]);
+  });
+
+  it('asks for expo-audio when no audio library is installed', () => {
+    mockOptionalModule('expo-audio');
+    mockOptionalModule('expo-av');
+
+    expect(audioLibraryLogsOnLoad()).toEqual([expect.stringContaining('"expo-audio"')]);
+  });
+});