This is changing pretty steadily. For example, the AWS SDK has TypeScript types packaged now and a promise interface. Compare this the boto3, the Python SDK, which has had a story open for years(?) to add async support with no official solution.

Node.js's own libraries are a mix of events and callbacks. Some of it can been "promisified", however they have yet to start a real async conversion AFAIK. I've had to wrap some of this stuff to create async interfaces for my own code.