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next.js/examples/with-google-analytics/pages/_document.js

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import React from 'react'
import Document, { Head, Main, NextScript } from 'next/document'
import flush from 'styled-jsx/server'
import { GA_TRACKING_ID } from '../lib/gtag'
export default class extends Document {
static getInitialProps ({ renderPage }) {
const { html, head, errorHtml, chunks } = renderPage()
const styles = flush()
return { html, head, errorHtml, chunks, styles }
}
render () {
return (
<html>
<Head>
{/* Global Site Tag (gtag.js) - Google Analytics */}
<script
async
src={`https://www.googletagmanager.com/gtag/js?id=${GA_TRACKING_ID}`}
/>
<script
dangerouslySetInnerHTML={{
__html: `
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', '${GA_TRACKING_ID}');
`
}}
/>
</Head>
<body>
<Main />
<NextScript />
</body>
</html>
)
}
}