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# Developing Neutrino
Developing and contributing to Neutrino and its core presets is done through our monorepo located at
https://github.com/mozilla-neutrino/neutrino-dev. The code is broken up into a couple different sections:
packages and documentation.
_Note: In this guide, commands executable from the command line are prepended with `❯`. Lines not starting
with this symbol show sample console output from running the previous command._
## Getting started
The first step to start developing neutrino-dev is forking the repository to your own GitHub account.
<a href="https://github.com/mozilla-neutrino/neutrino-dev/fork" target="_blank">Fork mozilla-neutrino/neutrino-dev on GitHub</a>
Once that is done, you can clone your copy of the repository on your computer, replacing `USER` with the username
of the account you forked the repository to:
```bash
❯ git clone git@github.com:USER/neutrino-dev.git
❯ cd neutrino-dev
```
## Making changes
When you make changes to neutrino-dev, you should make them in a branch separate from `master`. Start from the
master branch and create a new branch for your changes.
_Example: You want to create a core preset for JavaScript Standard Style. You need a new branch for this work._
```bash
❯ git checkout -b standard-style
Switched to a new branch 'standard-style'
```
While making changes, be sure to test your code out for expected operation. If possible or applicable, write a
test that can verify these changes in the future.
## Submitting a pull request
Once you are satisified with your changes, you should commit them and submit a pull request. Use `git add`
in order to add files that should be commited. Give your changes a descriptive but not overly verbose message.
```bash
❯ git add .
❯ git commit -m "Feature: Adding new core preset for JavaScript Standard Style"
❯ git push origin standard-style
```
Now if you open the GitHub page for your repository, GitHub should display a button to open a pull request for
the branch and commit you just pushed. When filling out the details of the pull request, try to be as descriptive
as possible, following our detailed [contribution guidelines](/contributing/README.md).
## Receiving updates
If you need to update your local copy of neutrino-dev to be in sync with the main neutrino-dev repository, you
will want to fetch upstream changes. Add the main neutrino-dev repo as an upstream to your local copy, then fetch
the latest changes from the master branch.
```bash
❯ git checkout master
❯ git remote add upstream https://github.com/mozilla-neutrino/neutrino-dev.git
❯ git pull upstream master
```
## Congrats!
You just made a contribution to Neutrino! We are so happy to have your help! :tada: