code: function (files, latestMigrationFile) {
          if (direction === 'do') {
              return files
                  .sort()
                  .filter(function () {
                  var _mustBeApplied = (latestMigrationFile === null);
                  return function (name) {
                      if (latestMigrationFile === name) {
                          _mustBeApplied = !_mustBeApplied;
                          return false;
                      }
                      return _mustBeApplied;
                  };
              }()
              );
          } else {
              return files.sort().reverse().filter(function (name) {
                  return latestMigrationFile === name;
              });
          }
      }
docs: Filters through the files in the migration folder and finds the statements that need to be applied to the database