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Full Stack Clojure / ClojureScript Project with re-frame

Setup

First, install the dependencies with npm:

yarn

Then, you can start the frontend service with:

clj -M:frontend

You find the application at http://localhost:8700.

Start the backend API with this alias:

clj -M:api

Find the backend server's documentation at: http://localhost:3000

Using Calva

When you are using Calva, you can start frontend and backend in one REPL Session by using the jack-in command, then choosing deps.edn + shadow-cljs and :frontend as the preferred alias. In the last dialog, choose :app.

To start the backend, load api.clj into your repl and call the main-function.

Demo (check also Shortcuts below)

demo.mp4

Better quality video is available at YouTube

Shortcut Advices

It is especially great if you have a REPL to be able to interact with the code directly from the editor. There are a few keyboard shortcuts for this, which you can configure them as you like. These are my (@n2o) recommendations:

  • C-c C-c (Control C, Control C): Evaluates S-Expression (thus sends the current code from the cursor to the REPL).
  • C-c C-k: Loads all the code from the file into the REPL.
  • C-c right: Moves the closing parenthesis one expression further to the right.
  • C-c left: Moves the closing parenthesis one expression back to the left.
  • C-c C-d: If you have accidentally created an endless loop, cancel the last expression with this abbreviation.

To install the shortcuts, open the Keyboard Shortcuts in VSCode under Preferences. In the top right-hand corner you will find an icon with which you can open the configuration file.

There you can add the following entries.

[
  {
    "key": "ctrl+c ctrl+c",
    "command": "calva.evaluateCurrentTopLevelForm",
    "when": "calva:connected"
  },
  {
    "key": "ctrl+c ctrl+d",
    "command": "calva.interruptAllEvaluations",
    "when": "calva:connected"
  },
  {
    "key": "ctrl+c ctrl+k",
    "command": "calva.loadFile",
    "when": "calva:connected"
  },
  {
    "key": "ctrl+c right",
    "command": "paredit.slurpSexpForward",
    "when": "calva:keybindingsEnabled && editorTextFocus && editorLangId == 'clojure' && editorLangId == 'clojure' && paredit:keyMap =~ /original|strict/"
  },
  {
    "key": "ctrl+c left",
    "command": "paredit.barfSexpForward",
    "when": "calva:keybindingsEnabled && editorTextFocus && editorLangId == 'clojure' && editorLangId == 'clojure' && paredit:keyMap =~ /original|strict/"
  }
]