_document.tsx

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

import type { DocumentContext } from 'next/document'

export default class TellMeDocument extends Document {
  static override async getInitialProps(ctx: DocumentContext) {
    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()
    }
  }
}