export type Unsubscribe = () => void;
export type Reducer<ST, A> = (state: ST, action: A) => ST;
export type Selector<ST> = (state: any) => ST;
export type Patcher<ST> = (state: any, value: ST) => void;
export type StateInitializer<T> = () => T;
export type StateUpdater<ST> = (state: ST) => ST;
export type StateModifier<ST> = (state: ST) => void;
export type SetState<ST> = (newState: ST | StateUpdater<ST>) => void;
export type UpdateState<ST> = (updater: StateModifier<ST>) => void;