ol.layer.Vector.getSource return type specialisation.

src/ol/layer/vectorlayer.js

@@ -67,6 +67,14 @@ ol.layer.Vector.prototype.getRenderOrder = function() {
 };
 
 
+/**
+ * @function
+ * @return {ol.source.Vector} Source.
+ * @api stable
+ */
+ol.layer.Vector.prototype.getSource;
+
+
 /**
  * Get the style for features.  This returns whatever was passed to the `style`
  * option at construction or to the `setStyle` method.