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Contributing to Cytoscape.js

Cytoscape.js is an open source project, and we greatly appreciate any and all contributions.

A blog post is available on geared towards first-time contributors with more in-depth instructions on the project's structure, the process of creating and merging changes to the code, and more.

If you'd like to contribute code to Cytoscape.js but you're not sure exactly what you'd like to implement, take a look at our current milestones to see what features we have planned in future --- or anything labelled help-wanted. Of course, we also welcome your own ideas.

Our goal is to make Cytoscape.js as comprehensive as possible. Thank you for taking the time and effort to contribute to help make that happen!

Submitting issues

Submit issues or feature requests to the issue tracker. If your issue pertains to an extension, you should file the issue on that extension's issue tracker instead.

Before submitting an issue, please ensure that the issue still exists in the latest version of the library. Because we follow semver, you can safely upgrade patch releases (x.y.z) and feature releases (x.y) without worry of breaking API changes.

Clearly describe your issue. List the steps necessary to reproduce your issue along with the corresponding code (preferably a JSBin, as that makes the issue less ambiguous and much faster to fix).

Make certain to mention the version of the library you are using and version of the browser/environment you are using.

Where to put changes

New features go in the unstable branch, which is used for the next (breaking/major or feature/minor) version. Bugfixes go in the master branch for the next bugfix/patch version. This allows us to follow semver nicely.

To propose a change, fork the cytoscape.js repository on Github, make a change, and then submit a pull request so that the proposed changes can be reviewed.

The source is organised in relatively the same as the documentation, under ./src. Try to maintain that organisation as best you can. You are free to create new files and require() them using the CommonJS/Node.js style.

Code style

Cytoscape.js is transpiled with Babel, so ES2015/ES6+ language features can be used.

Use two spaces for indentation, and single-quoted strings are preferred. The main thing is to try to keep your code neat and similarly formatted as the rest of the code. There isn't a strict styleguide. We do use eslint, so you can use eslint in the terminal or use eslint support in your editor.

You can run eslint --fix to automatically format the code to more or less match the style we use. It will only catch basic things, though.


Tests go in the ./test directory, as Mocha tests usually do. They are just a flat list of .js files that Mocha runs. If your change is a bugfix, please add a unit test that would fail without your fix. If your change is a new feature, please add unit tests accordingly. If your change is visual/rendering-related, then unit tests are not possible.

Please run gulp test or mocha to make sure all the unit tests are passing before you make your pull request.