How should optional store properties be defined?

[msssk]

The approach below seems to be what the docs suggest, with the addition of some typing, which mostly works. Once compiled this code works fine, but it would be nice to avoid having TS errors everywhere:

interface MyStore {
    created?: Date;
}
const store = createStore('store')({
    created: undefined,
} as MyStore);

// TS error: Cannot invoke an object which is possibly 'undefined'.ts(2722)
store.set.created(new Date());