We'd love to accept your patches and contributions to this project. If your patch fixes bugs or changes behaviour, please include a test for the change.
Code style broadly follows the Google JavaScript Style Guide. Javascript dialect is ES6. Lines are 80 columns, indents are 2 spaces. Use single-quotes for strings.
Contributions to this project must be accompanied by a Contributor License Agreement. 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.
All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.