Vulcan/packages/nova-core/lib/router.jsx

import Messages from "./messages.js";

FlowRouter.extendPathWithQueryParams = (path, params, newQueryParams) => {
  const current = FlowRouter.current();
  const currentQueryParams = _.clone(current.queryParams);
  return FlowRouter.path(path, params, _.extend(currentQueryParams, newQueryParams));
};

FlowRouter.triggers.exit([() => Messages.clearSeen()]);

FlowRouter.addToQueryArray = function (key, value) {
  var keyArray = FlowRouter.getQueryParam(key) || [];
  keyArray.push(value);
  var params = {};
  params[key] = keyArray;
  FlowRouter.setQueryParams(params);
}

FlowRouter.removeFromQueryArray = function (key, value) {
  var keyArray = FlowRouter.getQueryParam(key);
  keyArray = _.without(keyArray, value);
  var params = {};
  params[key] = keyArray;
  FlowRouter.setQueryParams(params);
}

// FlowRouter.notFound = {
//   action: function() {
//     if (Meteor.isClient) {
//       DocHead.addMeta({
//         name: "name",
//         property: "prerender-status-code",
//         content: "404"
//       });
//       DocHead.addMeta({
//         name: "name",
//         property: "robots",
//         content: "noindex, nofollow"
//       });
//     }
//     BlazeLayout.render("layout", {main: "not_found"});
//   }
// };

// FlowRouter.triggers.enter([function () {Events.analyticsRequest()}]);