Emotion SWC Plugin - Allow for jsxImportSource to be configurable

packages/next/build/swc/options.js

@@ -64,9 +64,9 @@ function getBaseSWCOptions({
         legacyDecorator: enableDecorators,
         decoratorMetadata: emitDecoratorMetadata,
         react: {
-          importSource: nextConfig?.experimental?.emotion
-            ? '@emotion/react'
-            : jsConfig?.compilerOptions?.jsxImportSource || 'react',
+          importSource:
+            jsConfig?.compilerOptions?.jsxImportSource ??
+            (nextConfig?.experimental?.emotion ? '@emotion/react' : 'react'),
           runtime: 'automatic',
           pragma: 'React.createElement',
           pragmaFrag: 'React.Fragment',

test/development/basic/emotion-swc.test.ts

@@ -0,0 +1,43 @@
+import { join } from 'path'
+import webdriver from 'next-webdriver'
+import { createNext, FileRef } from 'e2e-utils'
+import { NextInstance } from 'test/lib/next-modes/base'
+
+describe('emotion SWC option', () => {
+  let next: NextInstance
+
+  beforeAll(async () => {
+    next = await createNext({
+      files: {
+        'jsconfig.json': new FileRef(
+          join(__dirname, 'emotion-swc/jsconfig.json')
+        ),
+        pages: new FileRef(join(__dirname, 'emotion-swc/pages')),
+        shared: new FileRef(join(__dirname, 'emotion-swc/shared')),
+        'next.config.js': new FileRef(
+          join(__dirname, 'emotion-swc/next.config.js')
+        ),
+      },
+      dependencies: {
+        '@emotion/core': '^10.0.35',
+        '@emotion/styled': '^10.0.27',
+      },
+    })
+  })
+  afterAll(() => next.destroy())
+
+  it('should have styling from the css prop', async () => {
+    let browser
+    try {
+      browser = await webdriver(next.appPort, '/')
+      const color = await browser
+        .elementByCss('#test-element')
+        .getComputedCss('background-color')
+      expect(color).toBe('rgb(255, 192, 203)')
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+})

test/development/basic/emotion-swc/jsconfig.json

@@ -0,0 +1,5 @@
+{
+  "compilerOptions": {
+    "jsxImportSource": "@emotion/core"
+  }
+}

test/development/basic/emotion-swc/next.config.js

@@ -0,0 +1,10 @@
+/** @type {import('next').NextConfig} */
+
+const nextConfig = {
+  reactStrictMode: true,
+  experimental: {
+    emotion: true,
+  },
+}
+
+module.exports = nextConfig

test/development/basic/emotion-swc/pages/_app.js

@@ -0,0 +1,15 @@
+import createCache from '@emotion/cache'
+import { CacheProvider } from '@emotion/core'
+
+import { globalStyles } from '../shared/styles'
+
+const cache = createCache({ key: 'next' })
+
+const App = ({ Component, pageProps }) => (
+  <CacheProvider value={cache}>
+    {globalStyles}
+    <Component {...pageProps} />
+  </CacheProvider>
+)
+
+export default App

test/development/basic/emotion-swc/pages/index.js

@@ -0,0 +1,33 @@
+import { css } from '@emotion/core'
+import {
+  Animated,
+  Basic,
+  bounce,
+  Combined,
+  Pink,
+  BasicExtended,
+  ComponentSelectorsExtended,
+} from '../shared/styles'
+
+const Home = () => (
+  <div
+    id={'test-element'}
+    css={css`
+      display: flex;
+      flex-direction: column;
+      background-color: pink;
+    `}
+  >
+    <Basic>Cool Styles</Basic>
+    <Pink>Pink text</Pink>
+    <Combined>
+      With <code>:hover</code>.
+    </Combined>
+    <Animated animation={bounce}>Let's bounce.</Animated>
+    <ComponentSelectorsExtended>
+      <BasicExtended>Nested</BasicExtended>
+    </ComponentSelectorsExtended>
+  </div>
+)
+
+export default Home

test/development/basic/emotion-swc/shared/styles.js

@@ -0,0 +1,81 @@
+import { css, Global, keyframes } from '@emotion/core'
+import styled from '@emotion/styled'
+
+export const globalStyles = (
+  <Global
+    styles={css`
+      html,
+      body {
+        padding: 3rem 1rem;
+        margin: 0;
+        background: papayawhip;
+        min-height: 100%;
+        font-family: Helvetica, Arial, sans-serif;
+        font-size: 24px;
+      }
+    `}
+  />
+)
+
+export const basicStyles = css({
+  backgroundColor: 'white',
+  color: 'cornflowerblue',
+  border: '1px solid lightgreen',
+  borderRight: 'none',
+  borderBottom: 'none',
+  boxShadow: '5px 5px 0 0 lightgreen, 10px 10px 0 0 lightyellow',
+  transition: 'all 0.1s linear',
+  margin: '3rem 0',
+  padding: '1rem 0.5rem',
+})
+
+export const hoverStyles = css`
+  &:hover {
+    color: white;
+    background-color: lightgray;
+    border-color: aqua;
+    box-shadow: -15px -15px 0 0 aqua, -30px -30px 0 0 cornflowerblue;
+  }
+`
+export const bounce = keyframes`
+  from {
+    transform: scale(1.01);
+  }
+  to {
+    transform: scale(0.99);
+  }
+`
+
+export const Basic = styled.div`
+  ${basicStyles};
+`
+
+export const Combined = styled.div`
+  ${basicStyles};
+  ${hoverStyles};
+  & code {
+    background-color: linen;
+  }
+`
+
+export const Pink = styled(Basic)({
+  color: 'hotpink',
+})
+
+export const BasicExtended = styled(Basic)``
+
+export const ComponentSelectorsExtended = styled.div`
+  ${BasicExtended} {
+    color: green;
+  }
+  box-shadow: -5px -5px 0 0 green;
+`
+
+export const Animated = styled.div`
+  ${basicStyles};
+  ${hoverStyles};
+  & code {
+    background-color: linen;
+  }
+  animation: ${({ animation }) => animation} 0.2s infinite ease-in-out alternate;
+`