immstruct building pattern

gistfile1.js

// Content.js
Content.construct = function(statics, cursor, {country}) {
  cursor = cursor.update(() => Immutable.fromJS({
    country: (country || ""),
    url: statics.routePath,
  }))
  return new Promise((resolve, reject) => 
      setTimeout(() => resolve("Hello World"), 500))
    .then((value) => cursor.cursor('world').update(() => value))
}

// ProfilePageList.js
ProfilePageList.construct = function(statics, cursor) {
  cursor = cursor.update(() => Immutable.fromJS({
    crumbs: [
          {text: "Home", url: "/"},
          {text: "About", url: "/?1"}
        ],
    title: "My Website"
  }))
  return Content.construct(statics, cursor.cursor('contentState'), 
      {country: "Australia"})
}

// main
ProfilePageList.construct({
  routeParams: parameters, 
  routePath: window.location.pathname
}, structure.cursor())
.then(() => {
  var cursor = structure.cursor();
  document.title = cursor.cursor('title').deref();
})
.catch(console.error);