control-flow

```typescript

// From apps/whispering/src/routes/(app)/_layout-utils/check-ffmpeg.ts

export async function checkFfmpegRecordingMethodCompatibility() {

if (!window.__TAURI_INTERNALS__) return;

// Only check if FFmpeg recording method is selected

if (settings.value['recording.method'] !== 'ffmpeg') return;

const { data: ffmpegInstalled } = await rpc.ffmpeg.checkFfmpegInstalled.ensure();

if (ffmpegInstalled) return; // FFmpeg is installed, all good

// FFmpeg recording method selected but not installed

toast.warning('FFmpeg Required for FFmpeg Recording Method', {

// ... toast content

});

}

```

```typescript

// From apps/whispering/src/routes/(app)/_layout-utils/check-ffmpeg.ts

const isUsingNavigator = settings.value['recording.method'] === 'navigator';

const isUsingLocalTranscription =

settings.value['transcription.selectedTranscriptionService'] === 'whispercpp' ||

settings.value['transcription.selectedTranscriptionService'] === 'parakeet';

return isUsingNavigator && isUsingLocalTranscription && !isFFmpegInstalled;

```

```typescript

// From packages/epicenter/src/indexes/markdown/markdown-index.ts

/**

* This is checking if there's an old filename AND if it's different

* from the new one. It's essentially checking: "has the filename

* changed?" and "do we need to clean up the old file?"

*/

const needsOldFileCleanup = oldFilename && oldFilename !== filename;

if (needsOldFileCleanup) {

const oldFilePath = path.join(tableConfig.directory, oldFilename);

await deleteMarkdownFile({ filePath: oldFilePath });

tracking[table.name]!.deleteByFilename({ filename: oldFilename });

}

```