Want to contribute? Great! First, read this page (including the small print at the end).
You can help the Dart project in many ways, in addition to contributing code. For example, you can report bugs, ask and answer Dart questions on StackOverflow, and improve the documentation.
If you'd like to improve the documentation, you have three options:
Before we can use your code, you must sign the Google Individual Contributor License Agreement (CLA), which you can do online. The CLA is necessary mainly because you own the copyright to your changes, even after your contribution becomes part of our codebase, so we need your permission to use and distribute your code. We also need to be sure of various other things—for instance that you‘ll tell us if you know that your code infringes on other people’s patents. You don‘t have to sign the CLA until after you’ve submitted your code for review and a member has approved it, but you must do it before we can put your code into our codebase.
Before you start working on a larger contribution, you should get in touch with us first through the Dart Issue Tracker with your idea so that we can help out and possibly guide you. Coordinating up front makes it much easier to avoid frustration later on.
All submissions, including submissions by project members, require review. We use the same code-review tools and process as the chromium project.
We occasionally take pull requests, e.g., for comment changes, but the main flow is to use the Gerrit review system as explained below.
In order to submit a patch, you need to get the depot_tools.
To work with the Dart code, you need to download and build the development branch. Active development of Dart takes place on the
main branch, from which we push “green” versions that have passed all tests to
dev branch. Complete instructions are found at Getting The Source
Note: you can be in any branch when you run
git new-branch <feature name> <write code> git commit <write code...> git commit ...
As you work, and before you send a patch for review, you should ensure your branch is merging cleanly to
There are multiple ways to do this, but we generally recommend running:
Note: you can run this command from any branch.
This command will fetch
origin/main, rebase all your open branches, and delete cleanly merged branches.
Your local workflow may vary.
Upload the patch for review:
git cl upload -s
The above command returns a URL for the review. Attach this review to your issue in https://dartbug.com.
To update the cl, just commit your changes and run
git cl upload -s for your branch.
If you have commit access, when the review is done and the patch is good to go, submit the patch on https://dart-review.googlesource.com:
git cl web # opens your review on https://dart-review.googlesource.com
If you do not have commit access, a Dart engineer will commit on your behalf, assuming the patch is reviewed and accepted.
More detailed instructions for the
git cl tools available on https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_creating_uploading_a_cl
If the author of a patch is not a committer, they will need help landing the patch. Once a patch gets an LGTM, it's easy for a committer to merge it in.
The source code of Dart follows the:
You should familiarize yourself with those guidelines.
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 (not a range; don‘t use “2011-2012”, even if the original code did). If you edit an existing file you don’t have to update the year
// Copyright (c) 2017, 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.
Contributions made by corporations are covered by a different agreement than the one above, the Software Grant and Corporate Contributor License Agreement.
We pledge to maintain an open and welcoming environment. For details, see our code of conduct.