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Contributing to Harrow

Getting help

Most people will prefer to use the coud-hosted version of Harrow at

Paid plans include support which extends to debugging your environment and setup.

If you're a paid user of and you want to report an issue or send us a patch please let us know when talking to us, it will help us prioritise the issues we're dealing with.

If you're a paid user of please talk to us directly using the support channels embedded within the web application.


Most of Harrow is fairly well tested. Use of type-safe languages on the backend (Go) eliminate the need for a whole class of unit tests, but we're unlikey to be able to take a patch without corresponding tests.

Details of how to run tests are included in the README documents of the respective component sub-directories.

Coding guidelines

The backend is written in Go which includes a canonical formatter. Please make sure to run the formatter and check for redundant imports before preparing your PR. If you've changed the dependencies please be mindful to include the relevant lockfile changes for the package manager.

The front-end, style-guide, configuration management etc don't have fixed coding guidelines. Patches to introduce canonicalizing linters for these sub-projects would be gladly accepted. In lieu of that, "whatever vim does" is the expected format of files.


The changelog is maintained in Git notes ( Please refer to the post at for more information.

GitHub doesn't support PRs for tags/notes and non-tree refs, so unfortunately we can't make this part of the PR process, one of the core maintainers will write the changelog entry if one is required.

Breaking changes

We adhere to semver so breaking changes will require a major release. For breaking changes, it would normally be helpful to discuss them by raising a 'Proposal' issue or PR with examples of the new API you're proposing before doing a lot of work. Bear in mind that breaking changes may require many hundreds / thousands of users to update their code.

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