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Fix document styles with react 18 #35760

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Mar 31, 2022
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24 changes: 17 additions & 7 deletions packages/next/server/render.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -1431,23 +1431,33 @@ export async function renderToHTML(
})
}

const styles = jsxStyleRegistry.styles()
jsxStyleRegistry.flush()
const hasDocumentGetInitialProps = !(
isServerComponent ||
process.browser ||
!Document.getInitialProps
)

const documentInitialPropsRes =
isServerComponent || process.browser || !Document.getInitialProps
? {}
: await documentInitialProps()
const documentInitialPropsRes = hasDocumentGetInitialProps
? await documentInitialProps()
: {}
if (documentInitialPropsRes === null) return null

const { docProps } = (documentInitialPropsRes as any) || {}
const documentElement = () => {
if (isServerComponent || process.browser) {
return (Document as any)()
}

const { docProps } = (documentInitialPropsRes as any) || {}
return <Document {...htmlProps} {...docProps} />
}
let styles

if (hasDocumentGetInitialProps) {
styles = docProps.styles
} else {
styles = jsxStyleRegistry.styles()
jsxStyleRegistry.flush()
}

return {
bodyResult,
Expand Down
8 changes: 7 additions & 1 deletion test/development/basic/styled-components.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ import { join } from 'path'
import webdriver from 'next-webdriver'
import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'test/lib/next-modes/base'
import { fetchViaHTTP } from 'next-test-utils'
import { fetchViaHTTP, renderViaHTTP } from 'next-test-utils'

describe('styled-components SWC transform', () => {
let next: NextInstance
Expand Down Expand Up @@ -69,4 +69,10 @@ describe('styled-components SWC transform', () => {
)
).toBe('rgb(255, 255, 255)')
})

it('should contain styles in initial HTML', async () => {
const html = await renderViaHTTP(next.url, '/')
expect(html).toContain('background:transparent')
expect(html).toContain('color:white')
})
})