ionian/src/client/app.tsx

import React, { useRef, useState } from 'react';
import ReactDom from 'react-dom';
import {BrowserRouter, Route, Switch as RouterSwitch} from 'react-router-dom';
import { Gallery, ContentAbout} from './page/mod';

import './css/style.css';

const FooProfile = ()=><div>test profile</div>;
const App = () => {
    return (<BrowserRouter>
            <RouterSwitch>
                <Route path="/" exact render={()=><Gallery />}></Route>
                <Route path="/search" render={()=><Gallery />}></Route>
                <Route path="/doc" render={(prop)=><ContentAbout {...prop}/>}></Route>
                <Route path="/profile" component={FooProfile}></Route>
                <Route>
                    <div>404 Not Found</div>
                </Route>
            </RouterSwitch>
    </BrowserRouter>);
};

ReactDom.render(
    <App/>,
    document.getElementById("root")
)