Add existing to tracked

node_modules/@cesium/widgets/Source/Viewer/viewerCesiumInspectorMixin.js

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+import { defined, DeveloperError } from "@cesium/engine";
+import CesiumInspector from "../CesiumInspector/CesiumInspector.js";
+
+/**
+ * A mixin which adds the CesiumInspector widget to the Viewer widget.
+ * Rather than being called directly, this function is normally passed as
+ * a parameter to {@link Viewer#extend}, as shown in the example below.
+ * @function
+ *
+ * @param {Viewer} viewer The viewer instance.
+ *
+ * @exception {DeveloperError} viewer is required.
+ *
+ * @demo {@link https://sandcastle.cesium.com/index.html?id=cesium-inspector|Cesium Sandcastle Cesium Inspector Demo}
+ *
+ * @example
+ * const viewer = new Cesium.Viewer('cesiumContainer');
+ * viewer.extend(Cesium.viewerCesiumInspectorMixin);
+ */
+function viewerCesiumInspectorMixin(viewer) {
+  //>>includeStart('debug', pragmas.debug);
+  if (!defined(viewer)) {
+    throw new DeveloperError("viewer is required.");
+  }
+  //>>includeEnd('debug');
+
+  const cesiumInspectorContainer = document.createElement("div");
+  cesiumInspectorContainer.className = "cesium-viewer-cesiumInspectorContainer";
+  viewer.container.appendChild(cesiumInspectorContainer);
+  const cesiumInspector = new CesiumInspector(
+    cesiumInspectorContainer,
+    viewer.scene,
+  );
+
+  Object.defineProperties(viewer, {
+    cesiumInspector: {
+      get: function () {
+        return cesiumInspector;
+      },
+    },
+  });
+}
+export default viewerCesiumInspectorMixin;