consul/ui/packages/consul-ui/app/utils/routing/transitionable.js

const filter = function(routeName, atts, params) {
  if (typeof params.nspace !== 'undefined' && routeName.startsWith('dc.')) {
    routeName = `nspace.${routeName}`;
    atts = [params.nspace].concat(atts);
  }
  return [routeName, ...atts];
};
const replaceRouteParams = function(route, params = {}) {
  return (route.paramNames || [])
    .map(function(item) {
      if (typeof params[item] !== 'undefined') {
        return params[item];
      }
      return route.params[item];
    })
    .reverse();
};
export default function(route, params = {}, container) {
  if (route === null) {
    route = container.lookup('route:application');
  }
  let atts = replaceRouteParams(route, params);
  // walk up the entire route/s replacing any instances
  // of the specified params with the values specified
  let current = route;
  let parent;
  while ((parent = current.parent)) {
    atts = atts.concat(replaceRouteParams(parent, params));
    current = parent;
  }
  // Reverse atts here so it doen't get confusing whilst debugging
  // (.reverse is destructive)
  atts.reverse();
  return filter(route.name || 'application', atts, params);
}