Add existing to tracked

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

@@ -0,0 +1,78 @@
+// @ts-check
+
+import WebGLConstants from "../Core/WebGLConstants.js";
+
+/**
+ * Determines the action taken based on the result of the stencil test.
+ *
+ * @enum {number}
+ */
+const StencilOperation = {
+  /**
+   * Sets the stencil buffer value to zero.
+   *
+   * @type {number}
+   * @constant
+   */
+  ZERO: WebGLConstants.ZERO,
+
+  /**
+   * Does not change the stencil buffer.
+   *
+   * @type {number}
+   * @constant
+   */
+  KEEP: WebGLConstants.KEEP,
+
+  /**
+   * Replaces the stencil buffer value with the reference value.
+   *
+   * @type {number}
+   * @constant
+   */
+  REPLACE: WebGLConstants.REPLACE,
+
+  /**
+   * Increments the stencil buffer value, clamping to unsigned byte.
+   *
+   * @type {number}
+   * @constant
+   */
+  INCREMENT: WebGLConstants.INCR,
+
+  /**
+   * Decrements the stencil buffer value, clamping to zero.
+   *
+   * @type {number}
+   * @constant
+   */
+  DECREMENT: WebGLConstants.DECR,
+
+  /**
+   * Bitwise inverts the existing stencil buffer value.
+   *
+   * @type {number}
+   * @constant
+   */
+  INVERT: WebGLConstants.INVERT,
+
+  /**
+   * Increments the stencil buffer value, wrapping to zero when exceeding the unsigned byte range.
+   *
+   * @type {number}
+   * @constant
+   */
+  INCREMENT_WRAP: WebGLConstants.INCR_WRAP,
+
+  /**
+   * Decrements the stencil buffer value, wrapping to the maximum unsigned byte instead of going below zero.
+   *
+   * @type {number}
+   * @constant
+   */
+  DECREMENT_WRAP: WebGLConstants.DECR_WRAP,
+};
+
+Object.freeze(StencilOperation);
+
+export default StencilOperation;