express server

const express=require("express");
const path=require("path");

require("babel-register")({
    presets: ["env", "stage-0", "react"]
});

const React=require("react");
const {renderToString}=require("react-dom/server");
const {pageTemplate} = require("./pageTemplate");
const App=require("./client/src/App.jsx").default;

const app=express();
const port=3001;

app.use(express.json());
app.use(express.urlencoded({extended:true}));

app.use(express.static(path.join(__dirname,"./client/public")));

const renderPage=(reactComponent) => {
    const renderedComponent=renderToString(reactComponent);
    return pageTemplate.replace('<div id="root"></div>', `<div id="root">${renderedComponent}</div>`);
};

app.get("*", (req,res) => {
    console.warn("caught request");
    try{
        const context = {};
        const reactApp = renderPage(<App ssrLocation={req.url} />);
        res.send(reactApp);
    }catch(error){
        const result = [error.message, error.stack].join('\r\n');
        console.error(result);
        res.send(result);
    }
});

app.listen(port, () => console.log(`server is up on ${port}`));