draw_interaction.js

  draw.interaction = new ol.interaction.Draw({
    source: draw.Layer.getSource(),
    geometryFunction: draw.geometryFunction,
    freehand: draw.freehand,
    type: draw.type,
    style: draw.style,
    condition: e => {

      if (e.originalEvent.buttons === 1) {
        draw.vertices.push(e.coordinate);
        draw.mapview.popup(null);
        
        // Execute each method pushed into the draw.conditions array.
        draw.conditions?.forEach(fn => typeof fn === 'function' && fn(e))

        return true;
      }
    }
  })