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rsc-external.test.ts
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rsc-external.test.ts
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import path from 'path'
import { renderViaHTTP, fetchViaHTTP } from 'next-test-utils'
import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'test/lib/next-modes/base'
import webdriver from 'next-webdriver'
async function resolveStreamResponse(response: any, onData?: any) {
let result = ''
onData = onData || (() => {})
await new Promise((resolve) => {
response.body.on('data', (chunk) => {
result += chunk.toString()
onData(chunk.toString(), result)
})
response.body.on('end', resolve)
})
return result
}
describe('app dir - rsc external dependency', () => {
let next: NextInstance
if ((global as any).isNextDeploy) {
it('should skip for deploy mode for now', () => {})
return
}
beforeAll(async () => {
next = await createNext({
files: new FileRef(path.join(__dirname, './rsc-external')),
dependencies: {
'@next/font': 'canary',
react: 'latest',
'react-dom': 'latest',
swr: '2.0.0-rc.0',
},
packageJson: {
scripts: {
setup: `cp -r ./node_modules_bak/* ./node_modules`,
build: 'yarn setup && next build',
dev: 'yarn setup && next dev',
start: 'next start',
},
},
installCommand: 'yarn',
startCommand: (global as any).isNextDev ? 'yarn dev' : 'yarn start',
buildCommand: 'yarn build',
})
})
afterAll(() => next.destroy())
const { isNextDeploy } = global as any
const isReact17 = process.env.NEXT_TEST_REACT_VERSION === '^17'
if (isNextDeploy || isReact17) {
it('should skip tests for next-deploy and react 17', () => {})
return
}
it('should be able to opt-out 3rd party packages being bundled in server components', async () => {
await fetchViaHTTP(next.url, '/react-server/optout').then(
async (response) => {
const result = await resolveStreamResponse(response)
expect(result).toContain('Server: index.default')
expect(result).toContain('Server subpath: subpath.default')
expect(result).toContain('Client: index.default')
expect(result).toContain('Client subpath: subpath.default')
}
)
})
it('should handle external async module libraries correctly', async () => {
const clientHtml = await renderViaHTTP(next.url, '/external-imports/client')
const serverHtml = await renderViaHTTP(next.url, '/external-imports/server')
const sharedHtml = await renderViaHTTP(next.url, '/shared-esm-dep')
const browser = await webdriver(next.url, '/external-imports/client')
const browserClientText = await browser.elementByCss('#content').text()
function containClientContent(content) {
expect(content).toContain('module type:esm-export')
expect(content).toContain('export named:named')
expect(content).toContain('export value:123')
expect(content).toContain('export array:4,5,6')
expect(content).toContain('export object:{x:1}')
expect(content).toContain('swr-state')
}
containClientContent(clientHtml)
containClientContent(browserClientText)
// support esm module imports on server side, and indirect imports from shared components
expect(serverHtml).toContain('random-module-instance')
expect(sharedHtml).toContain(
'node_modules instance from client module random-module-instance'
)
})
it('should transpile specific external packages with the `transpilePackages` option', async () => {
const clientHtml = await renderViaHTTP(next.url, '/external-imports/client')
expect(clientHtml).toContain('transpilePackages:5')
})
it('should resolve the subset react in server components based on the react-server condition', async () => {
await fetchViaHTTP(next.url, '/react-server').then(async (response) => {
const result = await resolveStreamResponse(response)
expect(result).toContain('Server: <!-- -->subset')
expect(result).toContain('Client: <!-- -->full')
})
})
it('should resolve 3rd party package exports based on the react-server condition', async () => {
await fetchViaHTTP(next.url, '/react-server/3rd-party-package').then(
async (response) => {
const result = await resolveStreamResponse(response)
// Package should be resolved based on the react-server condition,
// as well as package's internal & external dependencies.
expect(result).toContain(
'Server: index.react-server:react.subset:dep.server'
)
expect(result).toContain('Client: index.default:react.full:dep.default')
// Subpath exports should be resolved based on the condition too.
expect(result).toContain('Server subpath: subpath.react-server')
expect(result).toContain('Client subpath: subpath.default')
}
)
})
it('should correctly collect global css imports and mark them as side effects', async () => {
await fetchViaHTTP(next.url, '/css/a').then(async (response) => {
const result = await resolveStreamResponse(response)
// It should include the global CSS import
expect(result).toMatch(/\.css/)
})
})
it('should handle external css modules', async () => {
const browser = await webdriver(next.url, '/css/modules')
expect(
await browser.eval(
`window.getComputedStyle(document.querySelector('h1')).color`
)
).toBe('rgb(255, 0, 0)')
})
it('should handle external css modules in pages', async () => {
const browser = await webdriver(next.url, '/test-pages')
expect(
await browser.eval(
`window.getComputedStyle(document.querySelector('h1')).color`
)
).toBe('rgb(255, 0, 0)')
})
it('should handle external @next/font', async () => {
const browser = await webdriver(next.url, '/font')
expect(
await browser.eval(
`window.getComputedStyle(document.querySelector('p')).fontFamily`
)
).toMatch(/^__myFont_.{6}, __myFont_Fallback_.{6}$/)
})
})