I've asked this question in the old forums, and the answer was "no".
I've now seen that the Trello UI is receiving a facelift (still in beta), but the available power-up client library seems to be the same, so I'm guessing the answer's the same, as well.
If that's the case, folks may find it useful to know that I've updated the TypeScript types I created a few years ago, and they're now on DefinitelyTyped (and, as such, the npm registry). Happy to hear of any issues on GitHub Discussions.
