text: import React from 'react'
  import PropTypes from 'prop-types'
  import Document, { Head, Main, NextScript } from 'next/document'
  import flush from 'styled-jsx/server'
  
  class MyDocument extends Document {
    render () {
      const { pageContext } = this.props
  
      return (
        <html lang="en" dir="ltr">
          <Head>
            <meta charSet="utf-8" />
            {/* Use minimum-scale=1 to enable GPU rasterization */}
            <meta
              name="viewport"
              content="minimum-scale=1, initial-scale=1, width=device-width, shrink-to-fit=no"
            />
            <link rel="shortcut icon" href="/static/favicon.ico"/>
            {/* PWA primary color */}
            <meta
              name="theme-color"
              content={pageContext ? pageContext.theme.palette.primary.main : null}
            />
            <link
              rel="stylesheet"
              href="https://fonts.googleapis.com/css?family=Roboto:300,400,500"
            />
          </Head>
          <body style={{ overflowX: 'auto', paddingBottom: 100 }}>
            <Main />
            <NextScript />
          </body>
        </html>
      )
    }
  }
  
  MyDocument.getInitialProps = ctx => {
    // Resolution order
    //
    // On the server:
    // 1. app.getInitialProps
    // 2. page.getInitialProps
    // 3. document.getInitialProps
    // 4. app.render
    // 5. page.render
    // 6. document.render
    //
    // On the server with error:
    // 1. document.getInitialProps
    // 2. app.render
    // 3. page.render
    // 4. document.render
    //
    // On the client
    // 1. app.getInitialProps
    // 2. page.getInitialProps
    // 3. app.render
    // 4. page.render
  
    // Render app and page and get the context of the page with collected side effects.
    let pageContext
    const page = ctx.renderPage(Component => {
      const WrappedComponent = props => {
        pageContext = props.pageContext
        return <Component {...props} />
      }
  
      WrappedComponent.propTypes = {
        pageContext: PropTypes.object.isRequired
      }
  
      return WrappedComponent
    })
  
    let css
    // It might be undefined, e.g. after an error.
    if (pageContext) {
      css = pageContext.sheetsRegistry.toString()
    }
  
    return {
      ...page,
      pageContext,
      // Styles fragment is rendered after the app and page rendering finish.
      styles: (
        <React.Fragment>
          <style
            id="jss-server-side"
            // eslint-disable-next-line react/no-danger
            dangerouslySetInnerHTML={{ __html: css }}
          />
          {flush() || null}
        </React.Fragment>
      )
    }
  }
  
  export default MyDocument
  