code: function(packageName, since, closure, scope) {
              if (Version.compare(Ext.getVersion(packageName), since) < 1) {
                  closure.call(scope);
              }
          }
docs: Create a closure for deprecated code.
  
  // This means Ext.oldMethod is only supported in 4.0.0beta and older.
  // If Ext.getVersion('extjs') returns a version that is later than '4.0.0beta', for example '4.0.0RC',
  // the closure will not be invoked
  Ext.deprecate('extjs', '4.0.0beta', function() {
  Ext.oldMethod = Ext.newMethod;
  
  ...
  });
  
  @param {String} packageName The package name
  @param {String} since The last version before it's deprecated
  @param {Function} closure The callback function to be executed with the specified version is less than the current version
  @param {Object} scope The execution scope (`this`) if the closure