@fgv/ts-web-extras/docs/ts-web-extras.exportusingfilesystemapi.md

Browser-compatible utilities and FileTree implementations

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## exportUsingFileSystemAPI() function

Export data using File System Access API with fallback to blob download.

**Signature:**

```typescript
export declare function exportUsingFileSystemAPI(data: unknown, suggestedName: string, description?: string, window?: Window): Promise<boolean>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

data


</td><td>

unknown


</td><td>

Data to export as JSON


</td></tr>
<tr><td>

suggestedName


</td><td>

string


</td><td>

Suggested filename for the save dialog


</td></tr>
<tr><td>

description


</td><td>

string


</td><td>

_(Optional)_ Description for file type filter (default: 'JSON files')


</td></tr>
<tr><td>

window


</td><td>

Window


</td><td>

_(Optional)_ Window object for API access (default: globalThis.window)


</td></tr>
</tbody></table>

**Returns:**

Promise&lt;boolean&gt;

Promise resolving to true if saved via File System Access API, false if fallback used