OL Zoom


### detect zoom change
```typeconst view = map.getView()  view.superAnimate = map.getView().animate  map.getView().animate = function(specs) {    this.oldZoom = this.getZoom()    this.newZoom = this.getZoomForResolution(specs.resolution)    this.superAnimate(specs)  }```

> [How to detect zoom change in OpenLayers](https://gis.stackexchange.com/questions/309387/how-to-detect-zoom-change-in-openlayers/309404)




