ol-extent/src/interaction/index.js

a JavaScript library for openlayers extent

import LayerSpyglass from './LayerSpyglass';
import LayerMagnify from './LayerMagnify';
import FreeHandCircle from './FreeHandCircle';
import MeasureTool from './MeasureTool';

export {
  MeasureTool,
  LayerMagnify,
  LayerSpyglass,
  FreeHandCircle
}