boot-expo

Minimal project that uses Boot to compile ClojureScript to run on Expo.

Uses boot-cljs to compile ClojureScript, boot-reload to recompile and load sources without restarting the app, and boot-cljs-repl to provide a read-eval-print loop into the running instance of the app.

I highly recommend the first 3 sections of the Modern ClojureScript tutorial to learn about using Boot with these tasks for ClojureScript for the web. The boot.build file for this Expo project is essentially the same as that for a web ClojureScript project.

Files

• main.js is the JavaScript entrypoint of the Expo application. Sets up remote loading of JavaScript files for the Google Closure Library (used by ClojureScript to load compiled JavaScript sources) to call into, maps module names for (js/require ...) to work in ClojureScript and initializes a root React component that waits for a root component from ClojureScript. This file contains all the magic, the rest of the project is like a normal Expo app or a normal ClojureScript web app.
• src/cljs/boot_expo/core.cljs contains a minimal ClojureScript React Native app that uses React Native directly without any wrappers.
• target/ is where all of the ClojureScript build output will go. target/main.js will be the entrypoint of the ClojureScript compiled part of the app.
• build.boot is the Boot file containing build tasks. The dev task starts a development environment with reloading and a REPL.

Running in development mode

Prerequisites: Make sure you are already ready to run normal JavaScript Expo projects by following Expo's Up and Running guide. Then make sure you have Boot installed.

At the root of this project run npm i as usual.

Then run boot dev to start the ClojureScript compilation process and the REPL server. Keep this running in the background. After it's ready, you can load your project normally with Expo (using XDE or exp). Disable "Live reload" from the developer menu of the app: that option uses the React Native packager and restarts the app when you edit sources, but boot-reload reloads sources directly using WebSockets without the need to restart.

To connect to the REPL, connect to the nREPL server indicated by the output of boot dev. This can be done using boot repl -c in another terminal, or from an editor such as Cursive, CIDER on Emacs, etc. In the resulting Clojure REPL, run (start-repl) to enter the ClojureScript REPL.

Then you're ready to go! :)

License

MIT License

Copyright (c) 2017 Nikhilesh S

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.