How to inline CSS in the head tag of a NextJS project?

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I managed to successfully inline my CSS by slightly tweaking the pages/_document.jsx file. I extended the <Head> component natively provided with NextJS and added it to my custom document markup. Here’s a partial representation of my modifications:

import { readFileSync } from 'fs';
import { join } from 'path';

class InlineStylesHead extends Head {
  getCssLinks() {
    return this.__getInlineStyles();
  }

  __getInlineStyles() {
    const { assetPrefix, files } = this.context._documentProps;
    if (!files || files.length === 0) return null;

    return files.filter(file => /\.css$/.test(file)).map(file => (
      <style
        key={file}
        data-href={`${assetPrefix}/_next/${file}`}
        dangerouslySetInnerHTML={{
          __html: readFileSync(join(process.cwd(), '.build', file), 'utf-8'),
        }}
      />
    ));
  }
}

class MyDocument extends Document {
  render() {
    return (
      <Html lang="en" dir="ltr">
        <InlineStylesHead>
          <meta name="theme-color" content="#ffcc66" />
        </InlineStylesHead>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}

I owe this solution to https://github.com/zeit/next-plugins/issues/238#issuecomment-432211871.

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