Always provide a default case for switch

src/ol/format/gpxformat.js

@@ -567,6 +567,9 @@ ol.format.GPX.writeWptType_ = function(node, coordinate, objectStack) {
       if (coordinate[2] !== 0) {
         properties['time'] = coordinate[2];
       }
+      break;
+    default:
+      // pass
   }
   /* jshint +W086 */
   var orderedKeys = ol.format.GPX.WPT_TYPE_SEQUENCE_[namespaceURI];

src/ol/interaction/modifyinteraction.js

@@ -656,6 +656,8 @@ ol.interaction.Modify.handleDragEvent_ = function(evt) {
         coordinates[depth[1]][depth[0]][segmentData.index + index] = vertex;
         segment[index] = vertex;
         break;
+      default:
+        // pass
     }
 
     this.setGeometryCoordinates_(geometry, coordinates);
@@ -952,6 +954,8 @@ ol.interaction.Modify.prototype.removeVertex_ = function() {
             }
           }
           break;
+        default:
+          // pass
       }
 
       if (deleted) {

src/ol/source/imagesource.js

@@ -178,6 +178,8 @@ ol.source.Image.prototype.handleImageChange = function(event) {
           new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADERROR,
               image));
       break;
+    default:
+      // pass
   }
 };
 

src/ol/source/urltilesource.js

@@ -143,6 +143,8 @@ ol.source.UrlTile.prototype.handleTileChange = function(event) {
       this.dispatchEvent(
           new ol.source.TileEvent(ol.source.TileEventType.TILELOADERROR, tile));
       break;
+    default:
+      // pass
   }
 };