import { Observable } from 'rxjs' ; import { OrdersChart } from './orders-chart' ; import { ProfitChart } from './profit-chart' ; export interface OrderProfitChartSummary { title : string ; value : number ; } export abstract class OrdersProfitChartData { abstract getOrderProfitChartSummary ( ) ; abstract getOrdersChartData ( period ) ; abstract getProfitChartData ( period ) ; }