code: function (scope, callback) {
      var executeDown = load('down');
  
      if (typeof scope === 'string') {
        this.internals.migrationMode = scope;
        this.internals.matching = scope;
      } else if (typeof scope === 'function') {
        callback = scope;
      }
  
      this.internals.argv.count = Number.MAX_VALUE;
      return Promise.fromCallback(
        function (callback) {
          executeDown(this.internals, this.config, callback);
        }.bind(this)
      ).asCallback(callback);
    }
docs: Executes down for all currently migrated migrations.