We welcome contributions from the community and have gathered guidelines here to help you get started.
While not absolutely required, it is encouraged that you first open an issue for any bug or feature request. This allows discussion on the proper course of action to take before coding begins.
yarn build
yarn test
Or in watch mode:
yarn test --watch
These commands should work if you use npm as well.
Most of the information you need to contribute code changes can be found here. In short: fork, make your changes, and submit a pull request.