Add existing to tracked

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

@@ -0,0 +1,78 @@
+// @ts-check
+
+import WebGLConstants from "../Core/WebGLConstants.js";
+
+/**
+ * Determines the function used to compare two depths for the depth test.
+ *
+ * @enum {number}
+ */
+const DepthFunction = {
+  /**
+   * The depth test never passes.
+   *
+   * @type {number}
+   * @constant
+   */
+  NEVER: WebGLConstants.NEVER,
+
+  /**
+   * The depth test passes if the incoming depth is less than the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  LESS: WebGLConstants.LESS,
+
+  /**
+   * The depth test passes if the incoming depth is equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  EQUAL: WebGLConstants.EQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is less than or equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  LESS_OR_EQUAL: WebGLConstants.LEQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is greater than the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  GREATER: WebGLConstants.GREATER,
+
+  /**
+   * The depth test passes if the incoming depth is not equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  NOT_EQUAL: WebGLConstants.NOTEQUAL,
+
+  /**
+   * The depth test passes if the incoming depth is greater than or equal to the stored depth.
+   *
+   * @type {number}
+   * @constant
+   */
+  GREATER_OR_EQUAL: WebGLConstants.GEQUAL,
+
+  /**
+   * The depth test always passes.
+   *
+   * @type {number}
+   * @constant
+   */
+  ALWAYS: WebGLConstants.ALWAYS,
+};
+
+Object.freeze(DepthFunction);
+
+export default DepthFunction;