Documentation of the protocol, and the JS API, is in https://github.com/mozilla/hawk/blob/main/API.md.
This was once hueniverse/hawk and relased as hawk.
Then, after the 7.0.10 release, it was moved to the hapijs/hawk repository and released as @hapi/hawk.
Hapi later de-supported the library, after releasing version 8.0.0.
It has since been moved to mozilla/hawk and is again released as hawk.
All of the intermediate versions are also relased as hawk.
Changes are represented in GitHub releases on this repository.
Mozilla maintains several Hawk implementations in different langauages, so it is likely to stay at Mozilla for some time.
This library is in "maintenance mode" -- no features will be added, and only security-related bugfixes will be applied.