Using fs from ClojureScript

core.cljs

(ns ^:figwheel-always figwheel4node-server.core
  (:require [cljs.nodejs :as nodejs]
            fs))
(nodejs/enable-util-print!)
(println "Hello from the Node!")
(def -main (fn [] nil))
(set! *main-cli-fn* -main)

project.clj

(defproject figwheel4node "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.9.0"]
                 [org.clojure/clojurescript "1.10.339"]]
  :plugins [[lein-cljsbuild "1.1.7"]
            [lein-figwheel "0.5.16"]]
  :clean-targets ^{:protect false} ["target"]
  :cljsbuild {
    :builds [{:id "server-dev"
              :source-paths ["server_src"]
              :figwheel true
              :compiler {:main figwheel4node-server.core
                         :output-to "target/server_out/figwheel4node_server_with_figwheel.js"
                         :output-dir "target/server_out"
                         :target :nodejs
                         :optimizations :none
                         :source-map true }}]}
  :figwheel {})