first commit

test/development/basic/styled-components/.gitignore

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+node_modules/

test/development/basic/styled-components/next.config.js

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+module.exports = {
+  compiler: {
+    styledComponents: {
+      displayName: true,
+    },
+  },
+}

test/development/basic/styled-components/package.json

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+{
+  "name": "styled-components",
+  "private": true,
+  "dependencies": {
+    "styled-components": "6.1.16"
+  }
+}

test/development/basic/styled-components/pages/_app.js

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+import { createGlobalStyle, ThemeProvider } from 'styled-components'
+
+const GlobalStyle = createGlobalStyle`
+  body {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+  }
+`
+
+const theme = {
+  colors: {
+    primary: '#0070f3',
+  },
+}
+
+export default function App({ Component, pageProps }) {
+  return (
+    <>
+      <GlobalStyle />
+      <ThemeProvider theme={theme}>
+        <Component {...pageProps} />
+      </ThemeProvider>
+    </>
+  )
+}

test/development/basic/styled-components/pages/_document.js

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+import Document from 'next/document'
+import { ServerStyleSheet } from 'styled-components'
+
+export default class MyDocument extends Document {
+  static async getInitialProps(ctx) {
+    const sheet = new ServerStyleSheet()
+    const originalRenderPage = ctx.renderPage
+
+    try {
+      ctx.renderPage = () =>
+        originalRenderPage({
+          enhanceApp: (App) => (props) =>
+            sheet.collectStyles(<App {...props} />),
+        })
+
+      const initialProps = await Document.getInitialProps(ctx)
+      return {
+        ...initialProps,
+        styles: (
+          <>
+            {initialProps.styles}
+            {sheet.getStyleElement()}
+          </>
+        ),
+      }
+    } finally {
+      sheet.seal()
+    }
+  }
+}

test/development/basic/styled-components/pages/index.js

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+import styled, { css } from 'styled-components'
+const Button = styled.a`
+  /* This renders the buttons above... Edit me! */
+  display: inline-block;
+  border-radius: 3px;
+  padding: 0.5rem 0;
+  margin: 0.5rem 1rem;
+  width: 11rem;
+  background: transparent;
+  color: white;
+  border: 2px solid white;
+
+  /* The GitHub button is a primary button
+   * edit this to target it specifically! */
+  ${(props) =>
+    props.$primary &&
+    css`
+      background: white;
+      color: black;
+    `}
+`
+
+export default function Home() {
+  console.log('__render__')
+  return (
+    <div
+      id="wrap-div"
+      css={`
+        background: black;
+      `}
+    >
+      <Button
+        href="https://github.com/styled-components/styled-components"
+        target="_blank"
+        rel="noopener"
+        $primary
+      >
+        GitHub
+      </Button>
+
+      <Button id="btn" href="/docs">
+        Documentation
+      </Button>
+    </div>
+  )
+}

test/development/basic/styled-components/styled-components.test.ts

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+import webdriver from 'next-webdriver'
+import { nextTestSetup } from 'e2e-utils'
+import { fetchViaHTTP, renderViaHTTP } from 'next-test-utils'
+
+describe('styled-components SWC transform', () => {
+  const { next } = nextTestSetup({
+    files: __dirname,
+    dependencies: {
+      'styled-components': '6.1.16',
+    },
+  })
+  async function matchLogs$(browser) {
+    let foundLog = false
+
+    const browserLogs = await browser.log()
+
+    browserLogs.forEach((log) => {
+      if (log.message.includes('Warning: Prop `%s` did not match.')) {
+        foundLog = true
+      }
+    })
+    return foundLog
+  }
+
+  it('should not have hydration mismatch with styled-components transform enabled', async () => {
+    let browser
+    try {
+      browser = await webdriver(next.url, '/')
+
+      // Compile /_error
+      await fetchViaHTTP(next.url, '/404')
+
+      // Try 4 times to be sure there is no mismatch
+      expect(await matchLogs$(browser)).toBe(false)
+      await browser.refresh()
+      expect(await matchLogs$(browser)).toBe(false)
+      await browser.refresh()
+      expect(await matchLogs$(browser)).toBe(false)
+      await browser.refresh()
+      expect(await matchLogs$(browser)).toBe(false)
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+
+  it('should render the page with correct styles', async () => {
+    const browser = await webdriver(next.url, '/')
+
+    expect(
+      await browser.eval(
+        `window.getComputedStyle(document.querySelector('#btn')).color`
+      )
+    ).toBe('rgb(255, 255, 255)')
+    expect(
+      await browser.eval(
+        `window.getComputedStyle(document.querySelector('#wrap-div')).color`
+      )
+    ).toBe('rgb(0, 0, 0)')
+  })
+
+  it('should enable the display name transform by default', async () => {
+    // make sure the index chunk gets generated
+    const html = await next.render('/')
+    expect(html).toContain('pages__Button')
+  })
+
+  it('should contain styles in initial HTML', async () => {
+    const html = await renderViaHTTP(next.url, '/')
+    expect(html).toContain('background:transparent')
+    expect(html).toContain('color:white')
+  })
+
+  it('should only render once on the server per request', async () => {
+    const outputs = []
+    next.on('stdout', (args) => {
+      outputs.push(args)
+    })
+    await renderViaHTTP(next.url, '/')
+    expect(
+      outputs.filter((output) => output.trim() === '__render__').length
+    ).toBe(1)
+  })
+})