I developed CoprocessorJS to assist with building out these sorts apps. I used it to develop this application and one that I posted a few months ago for interacting with iMessages: https://github.com/CamHenlin/MessagesForMacintosh I have a few other ideas for classic Mac apps that I’ll use CoprocessorJS for as well

Here’s a blog post explaining my reasoning behind CoprocessorJS: https://henlin.net/2021/12/21/Introducing-CoprocessorJS/