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Contributing to microsoft/react-native-macos

This document describes how to set up your development environment and contribute changes to the microsoft/react-native-macos project. This is a working fork of facebook/react-native where changes for supporting macOS are being staged.

Note: This repository will be accepting PRs only specific to macOS support. To contribute to React Native, please see Contributing to react-native

This document assumes basic working knowledge with Git and related tools. We are providing instructions specific to this project. You can either do this with the command prompt or with a combination of the command prompt and SourceTree.

Setting up your branch for changes

Creating your own fork

If you wish to contribute changes back to the microsoft/react-native-macos repository, start by creating your own fork of the repository. This is essential. This will keep the number of branches on the main repository to a small count. There are lots of developers in this project and creating lots of branches on the main repository does not scale. In your own fork, you can create as many branches as you like.

  • Navigate to GitHub with a browser and log in to your GitHub account. For the sake of this document, let's assume your username is johndoe.
  • Navigate to the microsoft/react-native-macos repository in the same browser session.
  • Click on the Fork button at the top right corner of the page.
  • Create the fork under your account. Your GitHub profile should now show react-native-macos as one of your repositories.
  • Create a folder on your device and clone your fork of the Microsoft repository. e.g. https://github.com/johndoe/react-native-macos.git. Notice how your GitHub username is in the repository location.
git clone https://github.com/johndoe/react-native-macos.git

Setting up the upstream repository

Before starting to contribute changes, please setup your upstream repository to the primary microsoft/react-native-macos repository.

  • When you run git remote -v, you should see only your fork in the output list
git remote -v

     origin  https://github.com/johndoe/react-native-macos.git (fetch)
     origin  https://github.com/johndoe/react-native-macos.git (push)
  • Map the primary react-native-macos repository as the upstream remote
git remote add upstream https://github.com/microsoft/react-native-macos.git
  • Now running git remote -v should show the upstream repository also
git remote -v

     origin  https://github.com/johndoe/react-native-macos.git (fetch)
     origin  https://github.com/johndoe/react-native-macos.git (push)
     upstream        https://github.com/microsoft/react-native-macos.git (fetch)
     upstream        https://github.com/microsoft/react-native-macos.git (push)
  • At this point you are ready to start branching and contributing back changes.

Setting up the branch

For each bug or task you complete, it is recommended that you start with a fresh branch. If you have any lingering changes in your current branch that you want to save, go ahead and commit them. If you are just beginning, then you are good to go. On github, navigate to your repository which should be forked from microsoft/react-native-macos as described in the above sections. Above the list of files is a dropdown that should say master. Use the dropdown to create a new branch and name is according to what you will be working on. (I.e. DropdownHighlight, CleanUpExamples, etc). Now you have created a new branch.

SourceTree: If you are using SourceTree you will want your branch to show up in SourceTree so you can commit changes to your branch. It takes time for it to show up automatically, so you can make it show by running git pull --all in your command prompt from the root. Once you see your new branch in SourceTree under Remotes on the left navigation pane, double click on your branch to check it out locally. A dialog will come up and the default settings should be fine, click Ok.

Git Command Line If you are using the command line, you will want to make sure you have your branch locally. It takes time for it to show up automatically, so you can make it show by running git pull --all in your command prompt from the root. Run git branch -a to see if your new branch shows up. Now you will want to check out your branch locally. You can do this with git checkout -b branch-name. Confirm you are now working out of the branch with git branch.

Merging upstream master into your fork master

From time to time, your fork will get out of sync with the upstream remote. Use the following commands to get the master branch of your fork up up to date.

git fetch upstream
git checkout master
git pull upstream master
git push

Merging upstream master into your current branch

Use these commands instead if you would like to update your current branch in your fork from the upstream remote.

git fetch upstream
git pull upstream master
git push

Contributing

Make the fix

Now that your branch is set up and ready for commits, go ahead and fix the bug you are working on or make some small change that you want to check in.

Verify your changes

Manually test your fix by running RNTester. Run Unit Tests and Integration Tests in the RNTesterPods Xcode project. The following automated tests will be run as part of CI, you can also verify manually before submitting a PR.

yarn test # run jest tests on JavaScript
yarn lint # run eslint on JavaScript
yarn flow-check-macos # run Flow checks on JavaScript

Commit your changes

SourceTree: In SourceTree, click on commit in the top left. This won't actually do anything to your files, it will just change to show the commit UI. In the bottom container, stage all of the files you want to submit by selecting them and clicking "Stage". Add a short message in the textbox at the bottom on what is included in your change. This will not show as your entire submission text, just for this commit.

Git Command Line To stage files using the command line, you need to run git add MyFileOne.tsx for each file. You can also look up how to add all files with changes under a directory. Next you will want to commit changes with git commit –m "This change updates the padding in the dropdown"

You can commit multiple times until you are ready to make a pull request. You should keep the message short since it will not be used in the bug notes and is just for keeping track of the multiple commits in one pull request.

Provide changelog information

Run yarn change in the root of the repo.

Create a Pull Request

SourceTree: In SourceTree click Push.

Git Command Line Run git push.

This will push any staged files you have in your branch.

Now go back to your fork on github. You should see a yellow bar at the top with your change and a button that says "Compare & Pull Request". Click that button.

Click "Create Pull Request".

A bunch of tests will automatically kick off to verify your PR. The tests marked as required must pass before a PR can be merged.

Someone will also have to review your change before the change is allowed to be merged in. They may ask questions for more information or ask you to change things. Be sure to respond to their comments and push additional changes to the branch if they ask you to modify things before they sign off.

Once you are happy with the changes, and want to merge them to the main microsoft/react-native-macos project, create a pull request from your branch directly to microsoft/react-native-macos master.

Members on the microsoft/react-native-macos core team will help merge your changes.

Now you are done! Celebrate!