text: import Map from '../src/ol/Map.js';
  import View from '../src/ol/View.js';
  import {GPX, GeoJSON, IGC, KML, TopoJSON} from '../src/ol/format.js';
  import {defaults as defaultInteractions, DragAndDrop} from '../src/ol/interaction.js';
  import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
  import {XYZ, Vector as VectorSource} from '../src/ol/source.js';
  
  const dragAndDropInteraction = new DragAndDrop({
    formatConstructors: [
      GPX,
      GeoJSON,
      IGC,
      KML,
      TopoJSON
    ]
  });
  
  const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
  const attributions = '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
    '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
  
  const map = new Map({
    interactions: defaultInteractions().extend([dragAndDropInteraction]),
    layers: [
      new TileLayer({
        source: new XYZ({
          attributions: attributions,
          url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
          maxZoom: 20
        })
      })
    ],
    target: 'map',
    view: new View({
      center: [0, 0],
      zoom: 2
    })
  });
  
  dragAndDropInteraction.on('addfeatures', function(event) {
    const vectorSource = new VectorSource({
      features: event.features
    });
    map.addLayer(new VectorLayer({
      source: vectorSource
    }));
    map.getView().fit(vectorSource.getExtent());
  });
  
  const displayFeatureInfo = function(pixel) {
    const features = [];
    map.forEachFeatureAtPixel(pixel, function(feature) {
      features.push(feature);
    });
    if (features.length > 0) {
      const info = [];
      let i, ii;
      for (i = 0, ii = features.length; i < ii; ++i) {
        info.push(features[i].get('name'));
      }
      document.getElementById('info').innerHTML = info.join(', ') || '&nbsp';
    } else {
      document.getElementById('info').innerHTML = '&nbsp;';
    }
  };
  
  map.on('pointermove', function(evt) {
    if (evt.dragging) {
      return;
    }
    const pixel = map.getEventPixel(evt.originalEvent);
    displayFeatureInfo(pixel);
  });
  
  map.on('click', function(evt) {
    displayFeatureInfo(evt.pixel);
  });
  