Create a new project with the Leiningen
lein new figwheel hello-world
cd hello-world lein figwheel
After a moment it will start a development webserver and open the page in your browser.
It also opens a Clojurescript REPL connected to the browser. Try entering
(js/alert "Test"): you should see an alert pop up in the browser.
hello_world/core.cljs. It will automatically refresh in your browser when you save it. You can use reload functionality similarly to the REPL by adding