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# How to Contribute
We'd love to accept your patches and contributions to this project. There are
just a few small guidelines you need to follow.
## Contributor License Agreement
Contributions to this project must be accompanied by a Contributor License
Agreement (CLA). You (or your employer) retain the copyright to your
contribution; this simply gives us permission to use and redistribute your
contributions as part of the project. Head over to
<https://cla.developers.google.com/> to see your current agreements on file or
to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one
(even if it was for a different project), you probably don't need to do it
again.
## Code Reviews
All submissions, including submissions by project members, require review. We
use GitHub pull requests for this purpose. Consult
[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
information on using pull requests.
## Coding style
The Dart source code in this repo follows the:
* [Dart style guide](https://dart.dev/guides/language/effective-dart/style)
You should familiarize yourself with those guidelines.
## File headers
All files in the Dart project must start with the following header; if you add a
new file please also add this. The year should be a single number stating the
year the file was created (don't use a range like "2011-2012"). Additionally, if
you edit an existing file, you shouldn't update the year.
// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
## Community Guidelines
This project follows
[Google's Open Source Community Guidelines](https://opensource.google/conduct/).
We pledge to maintain an open and welcoming environment. For details, see our
[code of conduct](https://dart.dev/code-of-conduct).