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Re-Natal

Bootstrap ClojureScript-based React Native apps with Reagent and re-frame

Artur Girenko, MIT License @drapanjanas

This project is a fork of dmotz/natal by Dan Motzenbecker with the goal of generating skeleton of native app for iOS and Android based on Reagent and re-frame.

The support of Figwheel is based on solution developed by Will Decker decker405/figwheel-react-native There are limitations currently, but IMHO this is the right way to go in order to support both platforms.

Re-Natal is a simple command-line utility that automates most of the process of setting up a React Native app running on ClojureScript with Reagent an re-frame.

Generated project works in iOS and Android devices.

State

  • Same codebase for iOS and Android
  • Figwheel used for REPL and live coding.
    • Works in iOS (tested using simulator).
    • Works in real Android device
    • Works in Android simulator Genymotion (with re-natal use-figwheel -H 10.0.3.2)
    • Works in stock Android emulator (with re-natal use-figwheel -H 10.0.2.2)
    • You can reload app any time, no problem.
    • "Debug in Chrome" is not required anymore.
  • Optimizations :simple is used to compile "production" index.ios.js and index.android.js
  • Unified way of using static images of rn 0.14 works

Usage

Before getting started, make sure you have the required dependencies installed.fix in

Then, install the CLI using npm:

$ npm install -g re-natal

To bootstrap a new app, run re-natal init with your app's name as an argument:

$ re-natal init FutureApp

If your app's name is more than a single word, be sure to type it in CamelCase. A corresponding hyphenated Clojure namespace will be created.

Re-Natal will create a simple skeleton based on the current version of Reagent and Day8/re-frame. If all goes well you should see printed out basic instructions how to run in iOS simulator.

$ cd future-app

To run in iOS:

$ re-natal xcode

and then run your app from Xcode normally.

To run in Android, connect your device and:

$ adb reverse tcp:8081 tcp:8081
$ react-native run-android

Initially the ClojureScript is compiled in "prod" profile, meaning index.*.js files are compiled with optimizations :simple. Development in such mode is not fun because of slow compilation and long reload time.

Luckily, this can be improved by compiling with optimizations :none and using Figwheel.

Using Figwheel in iOS simulator

Start your app from Xcode as described above.

Then, to start development mode execute commands:

$ re-natal use-figwheel
$ lein figwheel ios

This will generate index.ios.js and index.android.js which works with compiler modeoptimizations :none.

Using Figwheel in real Android device

To run figwheel with real Android device please read Running on Device. To make it work on USB connected device I had also to do the following:

$ adb reverse tcp:8081 tcp:8081
$ adb reverse tcp:3449 tcp:3449

Then:

$ re-natal use-figwheel
$ lein figwheel android

And deploy your app:

$ reaact-native run-android

Using Figwheel in Genymotion simulator

With genymotion Android simulator you have to use IP "10.0.3.2" in urls to refer to your local machine. To specify this use:

$ re-natal use-figwheel -H 10.0.3.2
$ lein figwheel android

Start your simulator and deploy your app:

$ reaact-native run-android

Using Figwheel in stock Android emulator (AVD)

With stock Android emulator you have to use IP "10.0.2.2" in urls to refer to your local machine. To specify this use:

$ re-natal use-figwheel -H 10.0.2.2
$ lein figwheel android

Start your simulator and deploy your app:

$ reaact-native run-android

REPL

You have to reload your app, and should see the REPL coming up with the prompt.

At the REPL prompt, try loading your app's namespace:

(in-ns 'future-app.ios.core)

Changes you make via the REPL or by changing your .cljs files should appear live in the simulator.

Try this command as an example:

(dispatch [:set-greeting "Hello Native World!"])

"Prod" build

Do this with command:

$ lein prod-build

It will clean and rebuild index.ios.js and index.android.js with optimizations :simple

Having index.ios.js and index.android.js build this way, you should be able to follow the RN docs to proceed with the release.

Upgrading existing Re-Natal project

Do this if you want to use newer version of re-natal.

Commit or backup your current project, so that you can restore it in case of any problem ;)

Upgrade re-natal npm package

$ npm upgrade -g re-natal

In root directory of your project run

$ re-natal upgrade

This will overwrite only some files which usually contain fixes in newer versions of re-natal, and are unlikely to be changed by the user. No checks are done, these files are just overwritten:

  • files in /env directory
  • figwheel-bridge.js

Then to continue development using figwheel

$ re-natal use-figwheel

To upgrade React Native to newer version please follow the official Upgrading guide of React Native. Re-Natal makes no changes to the files generated by react-native so the official guide should be valid.

Problems with Android simulator

Using Figwheel with android simulator is not working out of the box yet. Looks like the main reason for that is that requests to http://localhost:8081 fails because "localhost" is simulators own loopback interface and not the one of the host machine. According to Emulator docs instead of "localhost" a special IP: 10.0.2.2 should be used.

Tips

  • Having rlwrap installed is optional but highly recommended since it makes the REPL a much nicer experience with arrow keys.

  • Running multiple React Native apps at once can cause problems with the React Packager so try to avoid doing so.

  • You can launch your app on the simulator without opening Xcode by running re-natal launch in your app's root directory.

  • By default new Natal projects will launch on the iPhone 6 simulator. To change which device re-natal launch uses, you can run re-natal listdevices to see a list of available simulators, then select one by running re-natal setdevice with the index of the device on the list.

  • To change advanced settings run re-natal xcode to quickly open the Xcode project.

  • The Xcode-free workflow is for convenience. If you're encountering app crashes, you should open the Xcode project and run it from there to view errors.

Dependencies

As Re-Natal is the orchestration of many individual tools, there are quite a few dependencies. If you've previously done React Native or Clojure development, you should hopefully have most installed already. Platform dependencies are listed under their respective tools.

Aspirations

  • Xcode-free workflow with CLI tools
  • Templates for other ClojureScript React wrappers
  • Automatic wrapping of all React Native component functions for ClojureScript
  • Automatically run React packager in background
  • Automatically tail cljs build log and report compile errors
  • Working dev tools
  • Automatic bundling for offline device usage and App Store distribution
  • Android support

Contributions are welcome.

For more ClojureScript React Native resources visit cljsrn.org.