Very basic reagent + reitit front end routing template

core.cljs

(ns app.core
  (:require [reagent.core :as r]
            [reagent.dom :as rd]
            [reitit.frontend :as rf]
            [reitit.frontend.easy :as rfe]))

(defn about [] [:div "HELLO ABOUT ME"])
(defn another-view [] [:div "Another view"])
(defn home [] [:div "HOME"])
(def current-view (r/atom #'about))

(def router
  (rf/router
   [["/" {:name ::home
          :view #'home}]
    ["/about" {:name ::about
               :view #'about}]
    ["/another" {:name ::another
                 :view #'another-view}]]))

(rfe/start!
 router
 (fn [m]
   (reset! current-view (get-in m [:data :view])))
 {:use-fragment false})

(defn app []
  [:div
   [:div "HELLO WORLD"]
   [:a {:href (rfe/href ::home)} "Home"]
   [:a {:href (rfe/href ::about)} "About"]
   [:a {:href (rfe/href ::another)} "Another"]
   [@current-view]])

(rd/render [app] (.getElementById js/document "app"))