For the last 1.5 years or so I'm working quite a lot with Magewire, mainly thanks to the Hyvä Checkout. As I'm doing a lot of payment method integrations, I'm often required to use third-party javascript SDKs to do things like tokenization of credit card forms for PCI compliance.
Magewire is the technique used to build the Hyvä Checkout. Willem Poortman, the author of Magewire, is working on a big new version. In this blog post he outlines what he is working on.