How to contribute to xterm-addon-ligatures

Opening issues

The preferred way to report bugs or request features is to use GitHub issues. Before opening an issue, read these pointers.

Include information about the browser in which the problem occurred. Even if you tested several browsers, and the problem occurred in all of them, mention this fact in the bug report. Also include browser version numbers and the operating system that you're on.
Mention which release of xterm.js and xterm-addon-ligatures you're using. Preferably, try also with the current HEAD of the master branch, to ensure the problem has not already been fixed.
Mention precisely what went wrong. What did you expect to happen? What happened instead? Describe the exact steps a maintainer has to take to make the problem occur.
Be polite. Issues with an indignant or belligerent tone tend to be moved to the bottom of the pile.

Make sure you have a GitHub account
Fork xterm-addon-ligatures (how to fork a repo)
Make your changes
If your changes are easy to test or likely to regress, add tests. Tests go into corresponding .test.ts files.
Follow the general code style of the rest of the project (see below).
Submit a pull request (how to create a pull request). Don't put more than one feature/fix in a single pull request.

By contributing code to xterm-addon-ligatures you

agree to license the contributed code under xterm-addon-ligatures's MIT license.
confirm that you have the right to contribute and license the code in question. (Either you hold all rights on the code, or the rights holder has explicitly granted the right to use it like this, through a compatible open source license or through a direct agreement with you.)