Add existing to tracked

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

@@ -0,0 +1,80 @@
+/**
+ * Specifies whether the object casts or receives shadows from light sources when
+ * shadows are enabled.
+ *
+ * @enum {number}
+ */
+const ShadowMode = {
+  /**
+   * The object does not cast or receive shadows.
+   *
+   * @type {number}
+   * @constant
+   */
+  DISABLED: 0,
+
+  /**
+   * The object casts and receives shadows.
+   *
+   * @type {number}
+   * @constant
+   */
+  ENABLED: 1,
+
+  /**
+   * The object casts shadows only.
+   *
+   * @type {number}
+   * @constant
+   */
+  CAST_ONLY: 2,
+
+  /**
+   * The object receives shadows only.
+   *
+   * @type {number}
+   * @constant
+   */
+  RECEIVE_ONLY: 3,
+};
+
+/**
+ * @private
+ */
+ShadowMode.NUMBER_OF_SHADOW_MODES = 4;
+
+/**
+ * @private
+ */
+ShadowMode.castShadows = function (shadowMode) {
+  return (
+    shadowMode === ShadowMode.ENABLED || shadowMode === ShadowMode.CAST_ONLY
+  );
+};
+
+/**
+ * @private
+ */
+ShadowMode.receiveShadows = function (shadowMode) {
+  return (
+    shadowMode === ShadowMode.ENABLED || shadowMode === ShadowMode.RECEIVE_ONLY
+  );
+};
+
+/**
+ * @private
+ */
+ShadowMode.fromCastReceive = function (castShadows, receiveShadows) {
+  if (castShadows && receiveShadows) {
+    return ShadowMode.ENABLED;
+  } else if (castShadows) {
+    return ShadowMode.CAST_ONLY;
+  } else if (receiveShadows) {
+    return ShadowMode.RECEIVE_ONLY;
+  }
+  return ShadowMode.DISABLED;
+};
+
+Object.freeze(ShadowMode);
+
+export default ShadowMode;