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# guide/gs/reactNative/addAPI2

The actual implementation will depend on the actual functionality.

### Adding the `getField` function

#### 2. Add function to DocumentView\.tsx interface file

The `DocumentView.tsx` interface file lists all of the React Native functions on the DocumentView component.

Add the function declaration:

```js
getField = (fieldName: string): Promise<void | {fieldName: string, fieldValue?: any, fieldType?: string}> => {
    const tag = findNodeHandle(this._viewerRef);
    if(tag != null) {
      return DocumentViewManager.getField(tag, fieldName);
    }
    return Promise.resolve();
}
```

All functions return `Promise<void | T>` where `T` is the expected return type upon success. If the function returns `void` upon success, simply put `Promise<void>`.

While you are adding types, consider representing objects with reusable object types. You can use existing ones, or create a new type alias or interface in `AnnotOptions.ts` (see [Object Types](https://www.typescriptlang.org/docs/handbook/2/objects.html)).


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