logger.js

if (has("featurelayer-debug")) {
  // lazy-load dojo/aspect only when needed
  require(["dojo/aspect"], function(aspect) {
    aspect.after(featureLayer, "selectFeatures", function(args) {
      console.debug("Object IDs count: ", args.objectIds.length);
      // maybe write out to a log file
    }, true);
  });
}