Zápisník Josefa Rouska

Python a React.js programátor, zaměřený na Shopify integrace

Next.js - server side rendering for masses

Recently I had opportunity to use Next.js on a client project. I already heard how much work it saves but I just couldn’t believe how simple it was.

My requirements were following. Server rendered react application with jest as testing framework and styled-components as the best way to manage styles. If you aren’t interested in these be sure to checkout blogpost announcing version 2.0 of Next.js. There’s a bunch of examples showing integrations with other libraries.

To grasp the basics I followed tutorial on Learning Next.js. It got me through some early surprises. Eg. how route resolving is done on the server when using custom routes. But first lets take a look on how you define custom route. Magic is hidden behind the as attribute and everything is handled automatically.

<Link as={`/post/${show.id}`} href={`/post?id=${show.id}`}>
  <a>{show.name}</a>
</Link>

On the other hand server configuration is done on, well, server level. We need to manually define a route and then tell next.js which page is it. You can use plethora of nodejs servers as backend, but I’ve used the default one which is express.

server.get('/post/:id', (req, res) => {
  const actualPage = '/post';
  const queryParams = { id: req.params.id };
  app.render(req, res, actualPage, queryParams);
});

Please note that this is required only for server side rendering with custom routes.

Styled components

First library I want to integrate is styled-components integrating this library is pretty simple. Just copy pages/_document.js from example repo. To not break server side rendering we need to use babel plugin called babel-plugin-styled-components. Don’t forget to include .babelrc, I prefer to keep my babel configuration in package.json.

{
  "name": "hello-next",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "babel": {
    "presets": [
      "next/babel"
    ],
    "plugins": [
      [
        "styled-components",
        {
          "ssr": true
        }
      ]
    ]
  },
  "scripts": {
    "dev": "node server.js",
...

Tests using jest

To set up jest all you need to do is to add env to babel presets.

I also have a script that will automatically disable watch when run on CI server.

Want to learn more?

You can follow my progress on GitHub.com.

Školení Next.js

Vedu Next.js workshop, kde si vyzkoušíme Next.js v praxi.