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[`FileSystemAdapter`](FileSystemAdapter) › [`process`](FileSystemAdapter/process)
## FileSystemAdapter.process() method
**Signature:**
```typescript
process(normalizedPath: string, fn: (data: string) => string, options?: DataWriteOptions): Promise<string>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>normalizedPath</code> | <code>string</code> | |
| <code>fn</code> | <code>(data: string) => string</code> | |
| <code>options</code> | [`DataWriteOptions`](DataWriteOptions) | _(Optional)_ |
**Returns:**
`Promise<string>`