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next.js/examples/with-fela/pages/_document.js

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import Document, { Head, Main, NextScript } from 'next/document'
import { renderToSheetList } from 'fela-dom'
import getRenderer from '../fela'
export default class MyDocument extends Document {
static getInitialProps ({ renderPage }) {
const page = renderPage()
const renderer = getRenderer()
const sheetList = renderToSheetList(renderer)
renderer.clear()
return {
...page,
sheetList
}
}
render () {
const styleNodes = this.props.sheetList.map(({ type, media, css }) => (
<style data-fela-type={type} media={media}>{css}</style>
))
return (
<html>
<Head>
<title>My page</title>
{styleNodes}
</Head>
<body>
<Main />
<NextScript />
</body>
</html>
)
}
}