I have seen these questions a few times about where to find a type definitions file (trello.d.ts) for Trello Power-Ups and have also tried to BTS (Bing…), all for not. There might be others out there, but I have yet to find one. So here goes…
I have had a deep need to generate something like this as each Power-Up I create sets me back to the documentation over and over and over again for the most trivial of details. This is the first stab, open source to the community and if you have any issues, please feel free to create an issue or a pull request.