Supports core functionality that in some cases requires direct support from the compiler and runtime systems such as runtime type information and deferred binding.

class UI {

 /**
  * Returns <code>true</code> when running in production mode. Returns
  * <code>false</code> when running either in development mode, or when running
  * in a plain JVM.
  */
 static bool isProdMode() {
   // Replaced with "true" by DWT compiler.
   return false;
 }
}