fix(null-safety): Add null checks in various segmentation related code.

packages/tools/src/stateManagement/segmentation/segmentIndex.ts

@@ -69,6 +69,9 @@ function setActiveSegmentIndex(
 
   viewportIds.forEach((viewportId) => {
     const toolGroup = getToolGroupForViewport(viewportId);
+    if (!toolGroup) {
+      return;
+    }
     invalidateBrushCursor(toolGroup.id);
   });
 }

packages/tools/src/tools/base/ContourSegmentationBaseTool.ts

@@ -190,10 +190,12 @@ abstract class ContourSegmentationBaseTool extends ContourBaseTool {
 
       const viewportIds = getViewportIdsWithSegmentation(segmentationId);
 
-      const toolGroupIds = viewportIds.map((viewportId) => {
-        const toolGroup = getToolGroupForViewport(viewportId);
-        return toolGroup.id;
-      });
+      const toolGroupIds = viewportIds
+        .map((viewportId) => {
+          const toolGroup = getToolGroupForViewport(viewportId);
+          return toolGroup?.id;
+        })
+        .filter((toolGroupId): toolGroupId is string => toolGroupId != null);
 
       triggerAnnotationRenderForToolGroupIds(toolGroupIds);
     }

packages/tools/src/tools/segmentation/strategies/BrushStrategy.ts

@@ -60,7 +60,7 @@ export type InitializedOperationData = LabelmapToolOperationDataAny & {
     viewportIdsToRender: string[];
     centerCanvas?: Array<number>;
     viewport: Types.IViewport;
-  }
+  };
   memo?: LabelmapMemo;
   modified?: boolean;
 };
@@ -183,18 +183,24 @@ export default class BrushStrategy {
     this.configurationName = name;
 
     // Ensuring backwards compatibility - always have a circular cursor if none is defined
-    const cursorGeometryInitializer = initializers.find(init => init.hasOwnProperty(StrategyCallbacks.CalculateCursorGeometry))
-    const renderCursorInitializer = initializers.find(init => init.hasOwnProperty(StrategyCallbacks.RenderCursor));
+    const cursorGeometryInitializer = initializers.find((init) =>
+      init.hasOwnProperty(StrategyCallbacks.CalculateCursorGeometry)
+    );
+    const renderCursorInitializer = initializers.find((init) =>
+      init.hasOwnProperty(StrategyCallbacks.RenderCursor)
+    );
 
-    if(!cursorGeometryInitializer) {
+    if (!cursorGeometryInitializer) {
       initializers.push({
-        [StrategyCallbacks.CalculateCursorGeometry]: compositions.circularCursor.calculateCursorGeometry
+        [StrategyCallbacks.CalculateCursorGeometry]:
+          compositions.circularCursor.calculateCursorGeometry,
       });
     }
 
-    if(!renderCursorInitializer) {
+    if (!renderCursorInitializer) {
       initializers.push({
-        [StrategyCallbacks.RenderCursor]: compositions.circularCursor.renderCursor
+        [StrategyCallbacks.RenderCursor]:
+          compositions.circularCursor.renderCursor,
       });
     }
 
@@ -263,7 +269,12 @@ export default class BrushStrategy {
 
     const data = getStrategyData({ operationData, viewport, strategy: this });
 
-    if (!data) {
+    if (
+      !data ||
+      !data.imageVoxelManager ||
+      !data.segmentationVoxelManager ||
+      !data.segmentationImageData
+    ) {
       return null;
     }
 
@@ -411,7 +422,6 @@ export default class BrushStrategy {
     enabledElement: Types.IEnabledElement,
     operationData: InitializedOperationData
   ) => void;
-
 }
 /**
  * Adds a list method to the set of defined methods.

packages/tools/src/utilities/segmentation/getOrCreateSegmentationVolume.ts

@@ -15,6 +15,10 @@ function getOrCreateSegmentationVolume(
   segmentationId: string
 ): Types.IImageVolume | undefined {
   const { representationData } = getSegmentation(segmentationId);
+  if (!representationData.Labelmap) {
+    return;
+  }
+
   let { volumeId } =
     representationData.Labelmap as LabelmapSegmentationDataVolume;