Start using Interactor.js
First, install interactor.js using your preferred package manager.
If you're using babel and you wish to be able to use the decorator and class property syntax, you'll also need to install the appropriate babel plugins.
There are changes coming soon to the decorator syntax and the latest TC39 decorators proposal recommends using "legacy" decorators until those changes are ready. For more information, check out their FAQ.
Next, start using interactors!