Fix render/Feature scope issue

src/ol/render/Feature.js

@@ -305,14 +305,14 @@ class RenderFeature {
       this.flatCoordinates_
     );
   }
-}
-
   /**
    * @return {Array<number>|Array<Array<number>>} Ends or endss.
    */
-RenderFeature.prototype.getEnds = function () {
+  getEnds() {
     return this.ends_;
-};
+  }
+}
+
 RenderFeature.prototype.getEndss = RenderFeature.prototype.getEnds;
 
 /**