# detectNestUpload

**Kind:** Function

**Source:** [`atloria-monorepo/libs/parser-core/src/openapi/multipart.ts`](https://github.com/sherkety/atloria/blob/main/atloria-monorepo/libs/parser-core/src/openapi/multipart.ts#L164)

NestJS: `@UseInterceptors(FileInterceptor('avatar'))` and friends.

The interceptor argument is the multipart FIELD NAME — get that wrong and the picker uploads
under a name the server discards. `classDecorators` are consulted only when the handler also
declares an `@UploadedFile(s)` parameter: a controller-level interceptor applies to every
route in the class, and reading it unconditionally would turn a whole controller multipart.

## Signature

```ts
function detectNestUpload(methodDecorators: string, params: string, classDecorators): MultipartBody | undefined
```

## Parameters

| Name | Type |
|---|---|
| `methodDecorators` | `string` |
| `params` | `string` |
| `classDecorators` | `any` |

**Returns:** `MultipartBody | undefined`