Add existing to tracked

node_modules/@cesium/engine/Source/Scene/GltfPipeline/usesExtension.js

@@ -0,0 +1,18 @@
+import defined from "../../Core/defined.js";
+
+/**
+ * Checks whether the glTF uses the given extension.
+ *
+ * @param {object} gltf A javascript object containing a glTF asset.
+ * @param {string} extension The name of the extension.
+ * @returns {boolean} Whether the glTF uses the given extension.
+ *
+ * @private
+ */
+function usesExtension(gltf, extension) {
+  return (
+    defined(gltf.extensionsUsed) && gltf.extensionsUsed.indexOf(extension) >= 0
+  );
+}
+
+export default usesExtension;