Add Styled Components

• The process for adding styled components in a nextjs is easy but the styled components take some time for the initial load.
• To remove this initial load time, these steps need to be followed
• Following this article - link

Install the styled components

npm i babel-plugin-styled-components

Add the babel configs

• Create the .babelrc file

touch .babelrc

• The final .babelrc file should look like this

{
  "presets": [
    "next/babel"
  ],
  "plugins": [
    [
      "styled-components",
      {
        "ssr": true,
        "displayName": true,
        "preprocess": false
      }
    ]
  ]
}

In the _document.js page

• Add the following code in the _document.js page.
• I wish I could understand this, however this is also recommended in the official documentation
• Link

touch pages/_document.js

import Document from "next/document";
import { ServerStyleSheet } from "styled-components";

export default class MyDocument extends Document {
  static async getInitialProps(ctx) {
    const sheet = new ServerStyleSheet();
    const originalRenderPage = ctx.renderPage;

    try {
      ctx.renderPage = () =>
        originalRenderPage({
          enhanceApp: (App) => (props) =>
            sheet.collectStyles(<App {...props} />),
        });

      const initialProps = await Document.getInitialProps(ctx);
      return {
        ...initialProps,
        styles: (
          <>
            {initialProps.styles}
            {sheet.getStyleElement()}
          </>
        ),
      };
    } finally {
      sheet.seal();
    }
  }
}