const {
reducer,
...actionCreators,
} = generator(uniqueIdentifier, options);The uniqueIdentifier is needed by redeuce to create unique action types for its internal reducer.
It needs to be a string and can be anything as long as it is unique across all instances of simpleStore.
Technically, this can be anything. It will be useful for you as you look into the redux dev tools to see what actions are dispatched.
Each generator can have it's own specific options, see each generator doc below for more details.