Did you miss this example from the linked post about redux-toolkit? https://github.com/reduxjs/redux-toolkit/blob/4ab8c42cb20ae1e6f7b84a8ac0070eee54775b79/packa

Did you miss this example from the linked post about redux-toolkit? https://github.com/reduxjs/redux-toolkit/blob/4ab8c42cb20ae1e6f7b84a8ac0070eee54775b79/packages/toolkit/src/createAction.ts#L58 https://github.com/reduxjs/redux-toolkit/blob/4ab8c42cb20ae1... This is what types look like when you're on the library side. The post made very clear they aren't talking about the app dev side. The library types are complex like this so that the app devs have a smoother experience.