Add existing to tracked

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

@@ -0,0 +1,36 @@
+import DeveloperError from "../Core/DeveloperError.js";
+
+/**
+ * <p>
+ * An object that initializes a {@link Particle} from a {@link ParticleSystem}.
+ * </p>
+ * <p>
+ * This type describes an interface and is not intended to be instantiated directly.
+ * </p>
+ *
+ * @alias ParticleEmitter
+ * @constructor
+ *
+ * @see BoxEmitter
+ * @see CircleEmitter
+ * @see ConeEmitter
+ * @see SphereEmitter
+ */
+function ParticleEmitter(options) {
+  //>>includeStart('debug', pragmas.debug);
+  throw new DeveloperError(
+    "This type should not be instantiated directly.  Instead, use BoxEmitter, CircleEmitter, ConeEmitter or SphereEmitter.",
+  );
+  //>>includeEnd('debug');
+}
+
+/**
+ * Initializes the given {Particle} by setting it's position and velocity.
+ *
+ * @private
+ * @param {Particle} The particle to initialize
+ */
+ParticleEmitter.prototype.emit = function (particle) {
+  DeveloperError.throwInstantiationError();
+};
+export default ParticleEmitter;