diff --git a/src/viewport-three/viewport-host.ts b/src/viewport-three/viewport-host.ts
index 20c4a054..123602dd 100644
--- a/src/viewport-three/viewport-host.ts
+++ b/src/viewport-three/viewport-host.ts
@@ -350,6 +350,13 @@ interface AffectedSelectionIds {
   modelInstanceIds: Set<string>;
 }
 
+interface TransformPreviewTargetIds {
+  brushIds: Set<string>;
+  pathIds: Set<string>;
+  entityIds: Set<string>;
+  modelInstanceIds: Set<string>;
+}
+
 interface ViewportWaterSurfaceBinding {
   brush: BoxBrush;
   reflectionTextureUniform: { value: unknown } | null;