How to Contribute to the jQuery Project

Contributing to the jQuery open-source project allows developers to support one of the foundational libraries of the modern web while enhancing their own development skills. This guide outlines the essential ways developers can get involved, ranging from filing reproducible bug reports and enhancing documentation to setting up the local development environment and submitting pull requests to jQuery Core.

1. Report Bugs and Validate Existing Issues

Not all contributions require writing code for the library itself. One of the most impactful ways to help is by managing issues on the official jQuery repositories on GitHub.

  • Submit reproducible bugs: When reporting a bug, provide a minimal, isolated test case using tools like JSFiddle or CodePen. Clearly state the expected behavior, actual behavior, and affected browsers.
  • Triage open tickets: Help the maintainers by reviewing unconfirmed bug reports, testing them across various operating systems and browser versions, and reporting your findings to verify if the issue still exists in the latest releases.

2. Improve the Documentation

jQuery’s API documentation is maintained in dedicated repositories and welcomes contributions from the community.

  • Fix typos, grammatical errors, and broken links in the official API docs.
  • Expand code examples to clarify complex methods or modern use cases.
  • Clarify descriptions where functionality might be ambiguous or outdated.

3. Set Up the Local Environment

To contribute code directly to jQuery Core, you must set up the project locally:

  • Fork and clone: Fork the jquery/jquery repository on GitHub and clone your fork locally.
  • Install dependencies: Ensure you have Node.js installed, then run npm install within the project directory to install the necessary build tools and dependencies.
  • Build the library: Run npm run build to compile the source code into the distribution files.

4. Write Code and Adhere to Standards

Before making modifications, ensure your work aligns with the project's established conventions:

  • Follow the style guide: jQuery adheres to strict JavaScript coding standards, enforced via ESLint. Run npm test to automatically check for style and linting issues.
  • Write unit tests: Any new feature or bug fix must include corresponding unit tests written for QUnit. Tests are located in the test/ directory and can be executed locally by running the test suite via the command line or opening the test suite in a browser.

5. Submit Pull Requests

Once changes are made and verified:

  • Create a focused branch: Keep your changes isolated to a single issue or feature per git branch.
  • Commit messages: Write clear, concise commit messages that describe the intent of the change and reference the relevant issue number.
  • Sign the CLA: The OpenJS Foundation requires all contributors to sign a Contributor License Agreement (CLA) before a pull request can be merged.
  • Engage in code review: Maintainers will review your pull request. Be prepared to address feedback, adjust code style, or add additional test coverage as requested.