diff --git a/modules/bus/index.js b/modules/bus/index.js
index 14f69eeb..2f659e13 100644
--- a/modules/bus/index.js
+++ b/modules/bus/index.js
@@ -17,7 +17,7 @@ export default class Bus {
     }
     listenerList.push(callback);
     return callback;
-  };
+  }
 
   unsubscribe(key, callback) {
     const listenerList = this.listeners[key];
@@ -27,7 +27,7 @@ export default class Bus {
         return;
       }
     }
-  };
+  }
 
   tokensToStates(tokens) {
     return tokens.map( token => this.state[token] );
@@ -100,7 +100,7 @@ export default class Bus {
     } finally {
       this.lock.delete(key);
     }
-  };
+  }
 
   enableState(forToken, initValue) {
     this.keepStateFor.add(forToken);
diff --git a/modules/gems/exportTextData.js b/modules/gems/exportTextData.js
index b61c81e3..043a40ef 100644
--- a/modules/gems/exportTextData.js
+++ b/modules/gems/exportTextData.js
@@ -4,4 +4,4 @@ export default function(data, fileName) {
   link.href = "data:application/octet-stream;charset=utf-8;base64," + btoa(data);
   link.download = fileName;
   link.click();
-};
+}
diff --git a/modules/gems/shallowEqual.js b/modules/gems/shallowEqual.js
index 6485cff7..d50a39d6 100644
--- a/modules/gems/shallowEqual.js
+++ b/modules/gems/shallowEqual.js
@@ -20,4 +20,4 @@ export default function shallowEqual(objA, objB) {
   }
 
   return true;
-};
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/modules/lstream/emitter.js b/modules/lstream/emitter.js
index 633c13d0..09af41cf 100644
--- a/modules/lstream/emitter.js
+++ b/modules/lstream/emitter.js
@@ -22,7 +22,7 @@ export class Emitter extends StreamBase {
         this.observers.splice(i, 1);
       }
     }
-  };
+  }
 
   next(value) {
     if (this.state === EMITTING) {
diff --git a/web/app/cad/scene/views/openFaceView.js b/web/app/cad/scene/views/openFaceView.js
index 14c7c202..ef86a478 100644
--- a/web/app/cad/scene/views/openFaceView.js
+++ b/web/app/cad/scene/views/openFaceView.js
@@ -51,8 +51,8 @@ export class OpenFaceView extends SketchingView {
 
   createGeometry() {
 
-    const vertices = [];;
-    const normals = [];;
+    const vertices = [];
+    const normals = [];
     const normal = normalOfCCWSeq(this.bounds);
     this.bounds.forEach((v, i) => {
       vertices.push(v.x, v.y, v.z);
diff --git a/web/app/cad/scene/views/view.js b/web/app/cad/scene/views/view.js
index a50b6691..5a9387f7 100644
--- a/web/app/cad/scene/views/view.js
+++ b/web/app/cad/scene/views/view.js
@@ -94,7 +94,7 @@ export class View {
     this.disposers.call();
     this.model.ext.view = null;
     this.model = null;
-  };
+  }
 
   get isDisposed() {
     return this.model === null;
diff --git a/web/app/cad/sketch/inPlaceSketcher.js b/web/app/cad/sketch/inPlaceSketcher.js
index e8949e52..4673bb09 100644
--- a/web/app/cad/sketch/inPlaceSketcher.js
+++ b/web/app/cad/sketch/inPlaceSketcher.js
@@ -128,7 +128,7 @@ export class InPlaceSketcher {
     this.viewer.setTransformation(xx.x * width, xx.y * height, yy.x * width, yy.y* height,
       (sketchOriginDelta.x) * width + width,
       (sketchOriginDelta.y) * height + height, sceneSetup.oCamera.zoom);
-  };
+  }
   
   save() {
     this.ctx.services.storage.set(this.sketchStorageKey, this.viewer.io.serializeSketch({
diff --git a/web/app/sketcher/constr/constractibles.js b/web/app/sketcher/constr/constractibles.js
index d47d199d..10a02f1d 100644
--- a/web/app/sketcher/constr/constractibles.js
+++ b/web/app/sketcher/constr/constractibles.js
@@ -12,11 +12,11 @@ export class ContractibleObject {
     this.visitParams(p => out.push(p));
   }
 
-  init() {};
+  init() {}
 
-  visitParams() {};
+  visitParams() {}
 
-  visitChildren() {};
+  visitChildren() {}
 
   traverse(visitor) {
     visitor(this);
diff --git a/web/app/sketcher/constraints.js b/web/app/sketcher/constraints.js
index 5fab0e45..b2f5bc16 100644
--- a/web/app/sketcher/constraints.js
+++ b/web/app/sketcher/constraints.js
@@ -18,7 +18,7 @@ export class Coincident extends AbstractConstraint {
 
   static deserialize(refs, data) {
     return new Coincident(refs(data[0]), refs(data[1]));
-  };
+  }
 
   constructor(a, b) {
     super();
@@ -26,7 +26,7 @@ export class Coincident extends AbstractConstraint {
     this.b = b;
     a.linked.push(b);
     b.linked.push(a);
-  };
+  }
 
 
   getSolveData() {
@@ -566,12 +566,12 @@ export class SignedPerpendicular extends AbstractConstraint {
 
   static deserialize(refs, data) {
     return new SignedPerpendicular(refs(data[0]), refs(data[1]), refs(data[2]), refs(data[3]));
-  };
+  }
 
   constructor(p1, p2, p3, p4) {
     super();
     this.points = [p1, p2, p3, p4];
-  };
+  }
 
 
   getSolveData() {
diff --git a/web/app/sketcher/tools/loop-pick.js b/web/app/sketcher/tools/loop-pick.js
index 683d8827..ff3056fb 100644
--- a/web/app/sketcher/tools/loop-pick.js
+++ b/web/app/sketcher/tools/loop-pick.js
@@ -19,7 +19,7 @@ export class LoopPickTool extends Tool {
     this.marked.clear();
     this.pointToObject.clear();
     this.pickedLoop = null;
-  };
+  }
 
   cleanup() {
     this.clearMarked();
@@ -102,7 +102,7 @@ export class LoopPickTool extends Tool {
       }
     }
     this.viewer.refresh();
-  };
+  }
 
   pickLoop(p) {
     const pickResult = this.viewer.search(p.x, p.y, DEFAULT_SEARCH_BUFFER, true, false, []);
@@ -124,9 +124,9 @@ export class LoopPickTool extends Tool {
     } else {
       this.onMousedown(e);
     }
-  };
+  }
 
-  onMousedown(e) {};
+  onMousedown(e) {}
 
 }
 
diff --git a/web/app/sketcher/tools/origin.js b/web/app/sketcher/tools/origin.js
index f314f8f4..6ac1a233 100644
--- a/web/app/sketcher/tools/origin.js
+++ b/web/app/sketcher/tools/origin.js
@@ -8,17 +8,17 @@ export class ReferencePointTool extends Tool {
   
   restart() {
     this.sendSpecifyPointHint();
-  };
+  }
   
   cleanup(e) {
     this.viewer.cleanSnap();
-  };
+  }
   
   mousemove(e) {
     var p = this.viewer.screenToModel(e);
     this.viewer.snap(p.x, p.y, []);
     this.viewer.refresh();
-  };
+  }
   
   mousedown(e) {
     const needSnap = this.viewer.snapped != null;
@@ -28,7 +28,7 @@ export class ReferencePointTool extends Tool {
     this.pointPicked(p.x, p.y);
     this.viewer.refresh();
     this.viewer.toolManager.releaseControl();
-  };
+  }
   
   processCommand(command) {
     const referencePoint = this.viewer.referencePoint;
@@ -40,7 +40,7 @@ export class ReferencePointTool extends Tool {
     referencePoint.y += result.y;
     this.viewer.refresh();
     this.viewer.toolManager.releaseControl();
-  };
+  }
 }
 
 
diff --git a/web/app/sketcher/tools/pan.js b/web/app/sketcher/tools/pan.js
index 4c20cad9..9a1baef8 100644
--- a/web/app/sketcher/tools/pan.js
+++ b/web/app/sketcher/tools/pan.js
@@ -137,15 +137,15 @@ export class DelegatingPanTool extends BasePanTool {
   
   startDragging(e) {
     this.delegate.dispatchEvent(cloneEvent(e));
-  };
+  }
 
   mouseup(e) {
     this.delegate.dispatchEvent(cloneEvent(e));
-  };
+  }
 
   mousewheel(e) {
     this.delegate.dispatchEvent(cloneEvent(e));
-  };
+  }
 }
 
 function cloneEvent(event) {
diff --git a/web/app/sketcher/tools/tool.js b/web/app/sketcher/tools/tool.js
index 12db5354..91c4daf9 100644
--- a/web/app/sketcher/tools/tool.js
+++ b/web/app/sketcher/tools/tool.js
@@ -7,41 +7,41 @@ export class Tool {
     this.viewer = viewer;
   }
 
-  restart() {};
+  restart() {}
 
-  cleanup() {};
+  cleanup() {}
 
-  mousemove(e) {};
+  mousemove(e) {}
   
-  mousedown(e) {};
+  mousedown(e) {}
   
-  mouseup(e) {};
+  mouseup(e) {}
   
-  dblclick(e) {};
+  dblclick(e) {}
   
-  keydown(e) {};
+  keydown(e) {}
   
-  keypress(e) {};
+  keypress(e) {}
   
-  keyup(e) {};
+  keyup(e) {}
 
   sendMessage(text) {
     this.viewer.streams.tool.$message.next(text);
-  };
+  }
   
   sendHint(hint) {
     this.viewer.streams.tool.$hint.next(hint);
-  };
+  }
 
   sendSpecifyPointHint() {
     this.sendHint('specify point');
-  };
+  }
 
   pointPicked(x, y) {
     this.sendMessage('picked: ' + this.viewer.roundToPrecision(x) + " : " + this.viewer.roundToPrecision(y));
     this.viewer.referencePoint.x = x;
     this.viewer.referencePoint.y = y;
-  };
+  }
 
   snapIfNeed(p) {
     if (this.viewer.snapped != null) {