import { RecurringBillId } from '../model/recurring-bill-id' ; import { RecurringBill } from '../model/recurring-bill' ; export interface RecurringBills { find ( recurringBillId ) : Promise < RecurringBill > | null ; get ( recurringBillId ) : Promise < RecurringBill > ; save ( recurringBill ) : void ; } export const RECURRING_BILLS = 'RECURRING_BILLS' ;