Type defintions not aligned to js code

[sentientmachin3]

Some type definitions (and specifically the ones regarding the rollback and the commit method) are not aligned to how the JS code effectively behaves, resulting in @ts-ignore annotations being inserted in the code.

Personally I still like the fluent interface approach, and would be very appreciated if the types get an update (latest version is 1.2.4, last library version is 1.3.0).