Draw and Modify Features

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import Map from 'ol/Map.js';
import View from 'ol/View.js';
import {Draw, Modify, Snap} from 'ol/interaction.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {OSM, Vector as VectorSource} from 'ol/source.js';
import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';

var raster = new TileLayer({
  source: new OSM()
});

var source = new VectorSource();
var vector = new VectorLayer({
  source: source,
  style: new Style({
    fill: new Fill({
      color: 'rgba(255, 255, 255, 0.2)'
    }),
    stroke: new Stroke({
      color: '#ffcc33',
      width: 2
    }),
    image: new CircleStyle({
      radius: 7,
      fill: new Fill({
        color: '#ffcc33'
      })
    })
  })
});

var map = new Map({
  layers: [raster, vector],
  target: 'map',
  view: new View({
    center: [-11000000, 4600000],
    zoom: 4
  })
});

var modify = new Modify({source: source});
map.addInteraction(modify);

var draw, snap; // global so we can remove them later
var typeSelect = document.getElementById('type');

function addInteractions() {
  draw = new Draw({
    source: source,
    type: typeSelect.value
  });
  map.addInteraction(draw);
  snap = new Snap({source: source});
  map.addInteraction(snap);

}

/**
 * Handle change event.
 */
typeSelect.onchange = function() {
  map.removeInteraction(draw);
  map.removeInteraction(snap);
  addInteractions();
};

addInteractions();

<!DOCTYPE html>
<html>
  <head>
    <title>Draw and Modify Features</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>

  </head>
  <body>
    <div id="map" class="map"></div>
    <form class="form-inline">
      <label>Geometry type &nbsp;</label>
      <select id="type">
        <option value="Point">Point</option>
        <option value="LineString">LineString</option>
        <option value="Polygon">Polygon</option>
        <option value="Circle">Circle</option>
      </select>
    </form>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import {Draw, Modify, Snap} from 'ol/interaction.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';

      var raster = new TileLayer({
        source: new OSM()
      });

      var source = new VectorSource();
      var vector = new VectorLayer({
        source: source,
        style: new Style({
          fill: new Fill({
            color: 'rgba(255, 255, 255, 0.2)'
          }),
          stroke: new Stroke({
            color: '#ffcc33',
            width: 2
          }),
          image: new CircleStyle({
            radius: 7,
            fill: new Fill({
              color: '#ffcc33'
            })
          })
        })
      });

      var map = new Map({
        layers: [raster, vector],
        target: 'map',
        view: new View({
          center: [-11000000, 4600000],
          zoom: 4
        })
      });

      var modify = new Modify({source: source});
      map.addInteraction(modify);

      var draw, snap; // global so we can remove them later
      var typeSelect = document.getElementById('type');

      function addInteractions() {
        draw = new Draw({
          source: source,
          type: typeSelect.value
        });
        map.addInteraction(draw);
        snap = new Snap({source: source});
        map.addInteraction(snap);

      }

      /**
       * Handle change event.
       */
      typeSelect.onchange = function() {
        map.removeInteraction(draw);
        map.removeInteraction(snap);
        addInteractions();
      };

      addInteractions();
    </script>
  </body>
</html>