code: function(className) {
        let t = this;
  
        // __classes will be null if analyseClasses has not formally been called; this would be if the
        //  analyser is only called externally for getClass()
        if (!t.__classes) {
          t.__classes = []; 
        }
  
        // Add it
        if (t.__classes.indexOf(className) == -1) {
          t.__classes.push(className); 
        }
      }
docs: Called when a reference to a class is made
  @param className
  @private