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Contributing

Contributions are always welcome, no matter how large or small!

We want this community to be friendly and respectful to each other. Please follow it in all your interactions with the project.

Development workflow​

To get started with the project, run yarn in the root directory to install the required dependencies for each package:

yarn

While it's possible to use npm, the tooling is built around yarn, so you'll have an easier time if you use yarn for development.

While developing, you can run the example app to test your changes. Any changes you make in your library's JavaScript code will be reflected in the example app without a rebuild. If you change any native code, then you'll need to rebuild the example app.

To start the packager:

yarn example start

To run the example app on Android:

yarn example android

To run the example app on iOS:

yarn example ios

By default, the example is configured to build with the old architecture. To run the example with the new architecture, you can do the following:

  1. For Android, run:

    ORG_GRADLE_PROJECT_newArchEnabled=true yarn example android

  2. For iOS, run:

    RCT_NEW_ARCH_ENABLED=1 yarn example pods
    yarn example ios

If you are building for a different architecture than your previous build, make sure to remove the build folders first. You can run the following command to cleanup all build folders:

yarn clean

To confirm that the app is running with the new architecture, you can check the Metro logs for a message like this:

Running "HealthConnectExample" with {"fabric":true,"initialProps":{"concurrentRoot":true},"rootTag":1}

Note the "fabric":true and "concurrentRoot":true properties.

Make sure your code passes TypeScript and ESLint. Run the following to verify:

yarn typecheck
yarn lint

To fix formatting errors, run the following:

yarn lint --fix

Remember to add tests for your change if possible. Run the unit tests by:

yarn test

To edit the Objective-C or Swift files, open example/ios/HealthConnectExample.xcworkspace in XCode and find the source files at Pods > Development Pods > react-native-health-connect.

To edit the Java or Kotlin files, open example/android in Android studio and find the source files at react-native-health-connect under Android.

Commit message convention​

We follow the conventional commits specification for our commit messages:

  • fix: bug fixes, e.g. fix crash due to deprecated method.
  • feat: new features, e.g. add new method to the module.
  • refactor: code refactor, e.g. migrate from class components to hooks.
  • docs: changes into documentation, e.g. add usage example for the module..
  • test: adding or updating tests, e.g. add integration tests using detox.
  • chore: tooling changes, e.g. change CI config.

Our pre-commit hooks verify that your commit message matches this format when committing.

Linting and tests​

ESLint, Prettier, TypeScript

We use TypeScript for type checking, ESLint with Prettier for linting and formatting the code, and Jest for testing.

Our pre-commit hooks verify that the linter and tests pass when committing.

Scripts​

The package.json file contains various scripts for common tasks:

  • yarn bootstrap: setup project by installing all dependencies and pods.
  • yarn typecheck: type-check files with TypeScript.
  • yarn lint: lint files with ESLint.
  • yarn test: run unit tests with Jest.
  • yarn example start: start the Metro server for the example app.
  • yarn example android: run the example app on Android.
  • yarn example ios: run the example app on iOS.

Sending a pull request​

Working on your first pull request? You can learn how from this free series: How to Contribute to an Open Source Project on GitHub.

When you're sending a pull request:

  • Prefer small pull requests focused on one change.
  • Verify that linters and tests are passing.
  • Review the documentation to make sure it looks good.
  • Follow the pull request template when opening a pull request.
  • For pull requests that change the API or implementation, discuss with maintainers first by opening an issue.