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Contributing to Mate

First off, thanks for taking the time to contribute! ❤️

All types of contributions are encouraged and valued. See the Table of Contents for different ways to help and details about how this project handles them. Please make sure to read the relevant section before making your contribution. It will make it a lot easier for us maintainers and smooth out the experience for all involved. The community looks forward to your contributions. 🎉

And if you like the project, but just don't have time to contribute, that's fine. There are other easy ways to support the project and show your appreciation, which we would also be very happy about:

  • Star the project
  • Tweet about it
  • Refer this project in your project's readme
  • Mention the project at local meetups and tell your friends/colleagues

Table of Contents

Code of Conduct

This project and everyone participating in it is governed by the Mate Code of Conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior by opening a private security advisory or contacting the maintainer via the email listed on the GitHub profile.

I Have a Question

If you want to ask a question, we assume that you have read the available Documentation.

Before you ask a question, it is best to search for existing Issues that might help you. In case you have found a suitable issue and still need clarification, you can write your question in this issue. It is also advisable to search the internet for answers first.

If you then still feel the need to ask a question and need clarification, we recommend the following:

  • Open an Issue.
  • Provide as much context as you can about what you're running into.
  • Provide project and platform versions (nodejs, npm, etc), depending on what seems relevant.

We will then take care of the issue as soon as possible.

I Want To Contribute

Legal Notice

When contributing to this project, you must agree that you have authored 100% of the content, that you have the necessary rights to the content and that the content you contribute may be provided under the project licence.

Reporting Bugs

Before Submitting a Bug Report

A good bug report shouldn't leave others needing to chase you up for more information. Therefore, we ask you to investigate carefully, collect information and describe the issue in detail in your report. Please complete the following steps in advance to help us fix any potential bug as fast as possible.

  • Make sure that you are using the latest version.
  • Determine if your bug is really a bug and not an error on your side e.g. using incompatible environment components/versions (Make sure that you have read the documentation. If you are looking for support, you might want to check this section).
  • To see if other users have experienced (and potentially already solved) the same issue you are having, check if there is not already a bug report existing for your bug or error in the bug tracker.
  • Also make sure to search the internet (including Stack Overflow) to see if users outside of the GitHub community have discussed the issue.
  • Collect information about the bug:
    • Stack trace (Traceback)
    • OS, Platform and Version (Windows, Linux, macOS, x86, ARM)
    • Version of the interpreter, compiler, SDK, runtime environment, package manager, depending on what seems relevant.
    • Possibly your input and the output
    • Can you reliably reproduce the issue? And can you also reproduce it with older versions?

How Do I Submit a Good Bug Report?

You must never report security related issues, vulnerabilities or bugs including sensitive information to the issue tracker, or elsewhere in public. Instead, sensitive bugs must be sent by email to the maintainer (see the email on the GitHub profile), or reported via GitHub's private vulnerability reporting.

We use GitHub issues to track bugs and errors. If you run into an issue with the project:

  • Open an Issue. (Since we can't be sure at this point whether it is a bug or not, we ask you not to talk about a bug yet and not to label the issue.)
  • Explain the behavior you would expect and the actual behavior.
  • Please provide as much context as possible and describe the reproduction steps that someone else can follow to recreate the issue on their own. This usually includes your code. For good bug reports you should isolate the problem and create a reduced test case.
  • Provide the information you collected in the previous section.

Once it's filed:

  • The project team will label the issue accordingly.
  • A team member will try to reproduce the issue with your provided steps. If there are no reproduction steps or no obvious way to reproduce the issue, the team will ask you for those steps and mark the issue as needs-repro. Bugs with the needs-repro tag will not be addressed until they are reproduced.
  • If the team is able to reproduce the issue, it will be marked needs-fix, as well as possibly other tags (such as critical), and the issue will be left to be implemented by someone.

Suggesting Enhancements

This section guides you through submitting an enhancement suggestion for Mate, including completely new features and minor improvements to existing functionality. Following these guidelines will help maintainers and the community to understand your suggestion and find related suggestions.

Before Submitting an Enhancement

  • Make sure that you are using the latest version.
  • Read the documentation carefully and find out if the functionality is already covered, maybe by an individual configuration.
  • Perform a search to see if the enhancement has already been suggested. If it has, add a comment to the existing issue instead of opening a new one.
  • Find out whether your idea fits with the scope and aims of the project. It's up to you to make a strong case to convince the project's developers of the merits of this feature. Keep in mind that we want features that will be useful to the majority of our users and not just a small subset. If you're just targeting a minority of users, consider writing an add-on/plugin library.

How Do I Submit a Good Enhancement Suggestion?

Enhancement suggestions are tracked as GitHub issues.

  • Use a clear and descriptive title for the issue to identify the suggestion.
  • Provide a step-by-step description of the suggested enhancement in as many details as possible.
  • Describe the current behavior and explain which behavior you expected to see instead and why. At this point you can also tell which alternatives do not work for you.
  • You may want to include screenshots or screen recordings which help you demonstrate the steps or point out the part which the suggestion is related to. You can use LICEcap to record GIFs on macOS and Windows, and the built-in screen recorder in GNOME or SimpleScreenRecorder on Linux.
  • Explain why this enhancement would be useful to most Mate users. You may also want to point out the other projects that solved it better and which could serve as inspiration.

Your First Code Contribution

Welcome! Here's how to get a local development setup running:

  1. Clone the repository

    git clone https://github.com/nsanta/mate.git
cd mate
npm install

  2. Run the test suite

    npm test

    Tests use Vitest with jsdom. The suite has ~260 tests across 18 files.

  3. Run the demo server (optional, for manual verification)

    npm run server

    Then open http://localhost:3030 for the interactive demos (covers @request, @stream, @ws, @sse).

  4. Lint and format before pushing

    npm run lint
npm run format:check

    ESLint v9 (flat config) and Prettier are enforced. The CI pipeline will fail on lint errors.

  5. Build

    npm run build

    Bundles via Rolldown into dist/.

Improving The Documentation

The documentation lives in two places:

  • README.md — the canonical reference, shown on npm and GitHub.
  • website/docs/ — the Docusaurus site hosted at https://nsanta.github.io/mate/. Pages use Markdown with sidebar_position frontmatter; the sidebar is auto-generated from the filesystem.

To preview docs locally:

cd website
npm install
npm start

When adding a new page, place it under website/docs/usage/ and include frontmatter:

---
sidebar_position: <number>
---

Styleguides

The codebase follows the existing ESLint + Prettier configuration. A few conventions worth knowing:

  • No commented-out code or dead branches — the linter catches most of it.
  • Source files use ES modules ("type": "module").
  • Tests are colocated in tests/ and named <topic>.test.js.
  • New features should ship with tests. Aim for ≥95% coverage on touched files.

Commit Messages

This project follows Conventional Commits:

<type>(<scope>): <subject>

<body optional>

Common types:

  • feat — new feature
  • fix — bug fix
  • docs — documentation only
  • refactor — code change that neither fixes a bug nor adds a feature
  • test — adding or correcting tests
  • chore — build, tooling, dependencies

Example: feat(stream): support @stream:@append presenter

Join The Project Team

Maintainers are listed on the GitHub repository. If you'd like to become a maintainer, the best path is to consistently contribute high-quality pull requests over time. Start with issues labeled good first issue or help wanted.

Attribution

This guide is based on the contributing.md!