Add existing to tracked

node_modules/@cesium/engine/Source/Renderer/BufferUsage.js

@@ -0,0 +1,32 @@
+// @ts-check
+
+import WebGLConstants from "../Core/WebGLConstants.js";
+
+/**
+ * @private
+ * @enum {number}
+ */
+const BufferUsage = {
+  STREAM_DRAW: WebGLConstants.STREAM_DRAW,
+  STATIC_DRAW: WebGLConstants.STATIC_DRAW,
+  DYNAMIC_DRAW: WebGLConstants.DYNAMIC_DRAW,
+  DYNAMIC_READ: WebGLConstants.DYNAMIC_READ,
+};
+
+/**
+ * @private
+ * @param {BufferUsage} bufferUsage
+ */
+// @ts-expect-error https://github.com/CesiumGS/cesium/issues/13420
+BufferUsage.validate = function (bufferUsage) {
+  return (
+    bufferUsage === BufferUsage.STREAM_DRAW ||
+    bufferUsage === BufferUsage.STATIC_DRAW ||
+    bufferUsage === BufferUsage.DYNAMIC_DRAW ||
+    bufferUsage === BufferUsage.DYNAMIC_READ
+  );
+};
+
+Object.freeze(BufferUsage);
+
+export default BufferUsage;