Add existing to tracked

node_modules/@cesium/engine/Source/Scene/BufferPolygonMaterial.js

@@ -0,0 +1,41 @@
+// @ts-check
+
+import Frozen from "../Core/Frozen.js";
+import BufferPrimitiveMaterial from "./BufferPrimitiveMaterial.js";
+
+/** @import Color from "../Core/Color.js"; */
+/** @import BufferPolygon from "./BufferPolygon.js"; */
+
+/**
+ * @typedef {object} BufferPolygonMaterialOptions
+ * @property {Color} [color=Color.WHITE] Color of fill.
+ * @property {Color} [outlineColor=Color.WHITE] Color of outline.
+ * @property {number} [outlineWidth=0.0] Width of outline, 0-255px.
+ */
+
+/**
+ * Material description for a {@link BufferPolygon}.
+ *
+ * <p>BufferPolygonMaterial objects are {@link Packable|packable}, stored
+ * when calling {@link BufferPolygon#setMaterial}. Subsequent changes to the
+ * material will not affect the polygon until setMaterial() is called again.</p>
+ *
+ * @experimental This feature is not final and is subject to change without Cesium's standard deprecation policy.
+ * @extends BufferPrimitiveMaterial
+ */
+class BufferPolygonMaterial extends BufferPrimitiveMaterial {
+  /**
+   * @type {BufferPolygonMaterial}
+   * @ignore
+   */
+  static DEFAULT_MATERIAL = Object.freeze(new BufferPolygonMaterial());
+
+  /**
+   * @param {BufferPolygonMaterialOptions} [options]
+   */
+  constructor(options = Frozen.EMPTY_OBJECT) {
+    super(options);
+  }
+}
+
+export default BufferPolygonMaterial;