transformRotate does not exist?

`transformRotate ` - does not exist?

js:

```
var poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
var options = {pivot: [0, 25]};
var rotatedPoly = turf.transformRotate(poly, 10, options);
```

I want to rotate a polygon and cannot find method.

Is there any other way or rotating an `ImageSource` ?

No file or test is named in the issue. Start by locating the existing geometry transformation APIs and the Swift port’s corresponding Turf.js coverage; done means providing or documenting polygon rotation with the shown pivot and clarifying whether ImageSource rotation is in scope.

Written by the indexing model from the issue text.