import * as React from 'react' ; import { observer } from 'mobx-react' ; import DevTools from 'mobx-react-devtools' ; import { SearchBox , ContactList } from '../' ; @ observer export class App extends React . Component < { children : any ; params : any ; } , { } > { render ( ) { return ( < div className = "container" > < header className = "main-header" > < /header> < main > < aside > < SearchBox params = { this . props . params } /> < ContactList / > < /aside> { this . props . children } < /main> < footer className = "main-footer" > < /footer> < DevTools / > < /div>); } } ;