Flipper (formerly Sonar) is a platform for debugging mobile apps on iOS and Android. Visualize, inspect, and control your apps from a simple desktop interface. Use Flipper as is or extend it using the plugin API.
Flipper aims to be your number one companion for mobile app development on iOS and Android. Therefore, we provide a bunch of useful tools, including a log viewer, interactive layout inspector, and network inspector.
## Extending Flipper
Flipper is built as a platform. In addition to using the tools already included, you can create your own plugins to visualize and debug data from your mobile apps. Flipper takes care of sending data back and forth, calling functions, and listening for events on the mobile app.
Both Flipper's desktop app and native mobile SDKs are open-source and MIT licensed. This enables you to see and understand how we are building plugins, and of course, join the community and help to improve Flipper. We are excited to see what you will build on this platform.
NOTE: If you're on Windows, you need to use Yarn 1.5.1 until [this issue](https://github.com/yarnpkg/yarn/issues/6048) is resolved.
### Building standalone application
Provide either `--mac`, `--win`, `--linux` or any combination of them
to `yarn build` to build a release zip file for the given platform(s). E.g.
```
yarn build --mac --version $buildNumber
```
You can find the resulting artifact in the `dist/` folder.
## iOS SDK + Sample App
```
cd iOS/Sample
rm -f Podfile.lock
pod install --repo-update
open Sample.xcworkspace
<Runappfromxcode>
```
You can omit `--repo-update` to speed up the installation, but watch out as you may be building against outdated dependencies.
## Android SDK + Sample app
Start up an android emulator and run the following in the project root:
```
./gradlew :sample:installDebug
```
## React Native SDK + Sample app
```
cd react-native/ReactNativeFlipperExample
yarn
yarn android
```
Note that the first 2 steps need to be done only once.
Alternatively, the app can be started on `iOS` by running `yarn ios`.
#### Troubleshooting
Older yarn versions might show an error / hang with the message 'Waiting for the other yarn instance to finish'. If that happens, run the command `yarn` first separately in the directory `react-native/react-native-flipper`.
