duplex

type Action func() (Update, error)

type Duplexer[S State] interface {
	// Dispatch dispatches an event to the store.
	Dispatch(actions Action) tea.Cmd
}

type Reducer[S State] func(curr S, update Update) S

type State any

type StateChangeError struct{}

type StateChangeMsg[S State] interface {
	// Prev gets the previous state of the store.
	Prev() S
	// Curr gets the current state of the store.
	Curr() S
}

type Update any