code: function register(command, compareFn, events) {
          var commandID = "";
  
          if (!command || !compareFn) {
              console.log("Attempting to register a Sort method with a missing required parameter: command or compare function");
              return;
          }
          if (typeof command === "string") {
              commandID = command;
          } else {
              commandID = command.getID();
          }
  
          if (_sorts[commandID]) {
              console.log("Attempting to register an already-registered Sort method: " + command);
              return;
          }
  
          // Adds ".sort" to the end of each event to make them specific for the automatic sort.
          if (events) {
              events = events.split(" ");
              events.forEach(function (event, index) {
                  events[index] = events[index].trim() + ".sort";
              });
              events = events.join(" ");
          }
  
          var sort = new Sort(commandID, compareFn, events);
          _sorts[commandID] = sort;
          return sort;
      }
docs: Registers a working set sort method.
  @param {(string|Command)} command A command ID or a command object
  @param {function(File, File): number} compareFn The function that
  will be used inside JavaScript's sort function. The return a value
  should be >0 (sort a to a lower index than b), =0 (leaves a and b
  unchanged with respect to each other) or <0 (sort b to a lower index
  than a) and must always returns the same value when given a specific
  pair of elements a and b as its two arguments. Documentation at:
  https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/sort
  @param {?string} events One or more space-separated event types that
  DocumentManger uses. Each event passed will trigger the automatic
  sort. If no events are passed, the automatic sort will be disabled
  for that sort method.
  @return {?Sort}