module.ts

type FnMapperR<T> = {
  [K in keyof T]: (...args: any[]) => T[K]
}

type FnMapper2<T, U, R> = {
  [K in keyof U]: (t: T, u: U[K]) => R
}

declare function module <S, G, A, M> (module: {
  namespaced?: boolean,
  state?: Class<S>,
  getters?: FnMapperR<G>,
  actions?: FnMapper2<ActionContext<S, G>, A, Promise<any> | void>,
  mutations?: FnMapper2<S, M, void>
}): Module<S, G, A, M>