code: function push(to) {
      var actions = [];
      for (var _i = 1; _i < arguments.length; _i++) {
          actions[_i - 1] = arguments[_i];
      }
      for (var _a = 0, actions_1 = actions; _a < actions_1.length; _a++) {
          var set = actions_1[_a];
          for (var _b = 0, set_1 = set; _b < set_1.length; _b++) {
              var action = set_1[_b];
              to.push(action);
          }
      }
  }
docs: Concatenates arrays of [[Action]]s. @internal