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Project Setup

In this chapter, we will bootstrap a project using create-cljs-app and understand the code generated. We'll also study Hiccup, a CLJS alternative for JSX, and various ways to require namespaces.

We have already learned how to set up Shadow projects manually. We have also used the first-project for code examples in the last module. Unlike first-project Tinycanva will run in the browser instead of a Node terminal. So, to get the REPL working, we'll need to open the app in a browser, in place of running the node script in the shell.

Create a new project#

The app we are going to build is called Tinycanva. We'll use create-cljs-app to bootstrap the project:

In time, we'll make changes to the template project. create-cljs-app automatically installs some modules that we'll cover in this chapter. Once done, you should see a directory named tinycanva with the following contents:

The files and directories created by create-cljs-app might feel overwhelming at first. Let's break it down so we understand what's happening.

Understanding Shadow configuration#

The automatically-generated Shadow config should look similar to this:

By default, we have four builds:

  • a development server configured to run on port 3000 serving contents from the public directory

  • a nREPL server configured on port 3333 and one source path src

  • two dependencies that we'll learn about in detail soon: - Reagent: a minimalist Clojure wrapper for React - Devcards: a StoryBook-like tool for developing components in isolation

As of now, we should only be concerned with the :app build target. The other build targets i.e. :test, :e2e, and :cards are meant for testing the app.

The :app build target is configured to call app.core/main function on startup, target the browser runtime and spit JavaScript code to public/js. Let's check the main function definition.

The main function#

As we learned before, the function defined as :init-fn is called as soon as the app is ready. The generated app.core namespace is:


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