diff --git a/projects/_shared/src/custom-shapes.ts b/projects/_shared/src/custom-shapes.ts
index 0d53251..c353041 100644
--- a/projects/_shared/src/custom-shapes.ts
+++ b/projects/_shared/src/custom-shapes.ts
@@ -13,7 +13,7 @@ class CustomRectangleShape extends RectangleShape {
     this.isRounded = true; // force rounded shape
   }
 
-  paintBackground(
+    override paintBackground(
     c: AbstractCanvas2D,
     x: number,
     y: number,
@@ -24,7 +24,7 @@ class CustomRectangleShape extends RectangleShape {
     super.paintBackground(c, x, y, w, h);
   }
 
-  paintVertexShape(
+    override paintVertexShape(
     c: AbstractCanvas2D,
     x: number,
     y: number,
@@ -41,7 +41,7 @@ class CustomEllipseShape extends EllipseShape {
     super(bounds, fill, stroke, 5);
   }
 
-  paintVertexShape(
+    override paintVertexShape(
     c: AbstractCanvas2D,
     x: number,
     y: number,
diff --git a/projects/_shared/src/generate-graph.ts b/projects/_shared/src/generate-graph.ts
index 0ac3edc..8fb24bf 100644
--- a/projects/_shared/src/generate-graph.ts
+++ b/projects/_shared/src/generate-graph.ts
@@ -30,6 +30,7 @@ class CustomGraph extends BaseGraph {
         // Register builtin styles
         PerimeterRegistry.add('ellipsePerimeter', Perimeter.EllipsePerimeter);
         PerimeterRegistry.add('rectanglePerimeter', Perimeter.RectanglePerimeter); // declared in the default vertex style, so must be registered to be used
+
         EdgeStyleRegistry.add('orthogonalEdgeStyle', EdgeStyle.OrthConnector, {handlerKind: 'segment', isOrthogonal: true});
 
         const arrowFunction = EdgeMarker.createArrow(2);
diff --git a/projects/_shared/tsconfig.json b/projects/_shared/tsconfig.json
index dc0e497..6086cf5 100644
--- a/projects/_shared/tsconfig.json
+++ b/projects/_shared/tsconfig.json
@@ -15,7 +15,8 @@
     "declaration": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "noImplicitReturns": true
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
   },
   "include": ["src"]
 }