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rsc-basic.test.ts
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rsc-basic.test.ts
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import path from 'path'
import fs from 'fs-extra'
import webdriver from 'next-webdriver'
import { renderViaHTTP, fetchViaHTTP, check } from 'next-test-utils'
import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'test/lib/next-modes/base'
import cheerio from 'cheerio'
function getNodeBySelector(html, selector) {
const $ = cheerio.load(html)
return $(selector)
}
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 - react server components', () => {
let next: NextInstance
let distDir: string
if ((global as any).isNextDeploy) {
it('should skip for deploy mode for now', () => {})
return
}
beforeAll(async () => {
const appDir = path.join(__dirname, './rsc-basic')
next = await createNext({
files: {
node_modules_bak: new FileRef(path.join(appDir, 'node_modules_bak')),
public: new FileRef(path.join(appDir, 'public')),
components: new FileRef(path.join(appDir, 'components')),
app: new FileRef(path.join(appDir, 'app')),
'next.config.js': new FileRef(path.join(appDir, 'next.config.js')),
},
dependencies: {
'styled-components': '6.0.0-alpha.5',
react: 'experimental',
'react-dom': 'experimental',
},
packageJson: {
scripts: {
setup: `cp -r ./node_modules_bak/non-isomorphic-text ./node_modules; cp -r ./node_modules_bak/random-module-instance ./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',
})
distDir = path.join(next.testDir, '.next')
})
afterAll(() => next.destroy())
const { isNextDeploy, isNextDev } = 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 render server components correctly', async () => {
const homeHTML = await renderViaHTTP(next.url, '/', null, {
headers: {
'x-next-test-client': 'test-util',
},
})
// should have only 1 DOCTYPE
expect(homeHTML).toMatch(/^<!DOCTYPE html><html/)
// TODO: support next/head
// expect(homeHTML).toMatch('<meta name="rsc-title" content="index"/>')
expect(homeHTML).toContain('component:index.server')
// TODO: support env
// expect(homeHTML).toContain('env:env_var_test')
expect(homeHTML).toContain('header:test-util')
const inlineFlightContents = []
const $ = cheerio.load(homeHTML)
$('script').each((index, tag) => {
const content = $(tag).text()
if (content) inlineFlightContents.push(content)
})
const internalQueries = [
'__nextFallback',
'__nextLocale',
'__nextDefaultLocale',
'__nextIsNotFound',
'__flight__',
'__props__',
'__flight_router_path__',
]
const hasNextInternalQuery = inlineFlightContents.some((content) =>
internalQueries.some((query) => content.includes(query))
)
expect(hasNextInternalQuery).toBe(false)
})
it('should reuse the inline flight response without sending extra requests', async () => {
let hasFlightRequest = false
let requestsCount = 0
await webdriver(next.url, '/root', {
beforePageLoad(page) {
page.on('request', (request) => {
requestsCount++
const url = request.url()
if (/\?__flight__=1/.test(url)) {
hasFlightRequest = true
}
})
},
})
expect(requestsCount).toBeGreaterThan(0)
expect(hasFlightRequest).toBe(false)
})
it('should support multi-level server component imports', async () => {
const html = await renderViaHTTP(next.url, '/multi')
expect(html).toContain('bar.server.js:')
expect(html).toContain('foo.client')
})
it('should resolve different kinds of components correctly', async () => {
const html = await renderViaHTTP(next.url, '/shared')
const main = getNodeBySelector(html, '#main').html()
// Should have 5 occurrences of "client_component".
expect(Array.from(main.matchAll(/client_component/g)).length).toBe(5)
// Should have 2 occurrences of "shared:server", and 2 occurrences of
// "shared:client".
const sharedServerModule = Array.from(main.matchAll(/shared:server:(\d+)/g))
const sharedClientModule = Array.from(main.matchAll(/shared:client:(\d+)/g))
expect(sharedServerModule.length).toBe(2)
expect(sharedClientModule.length).toBe(2)
// Should have 2 modules created for the shared component.
expect(sharedServerModule[0][1]).toBe(sharedServerModule[1][1])
expect(sharedClientModule[0][1]).toBe(sharedClientModule[1][1])
expect(sharedServerModule[0][1]).not.toBe(sharedClientModule[0][1])
// Note: This is currently unsupported because packages from another layer
// will not be re-initialized by webpack.
// Should import 2 module instances for node_modules too.
// const modFromClient = main.match(
// /node_modules instance from \.client\.js:(\d+)/
// )
// const modFromServer = main.match(
// /node_modules instance from \.server\.js:(\d+)/
// )
// expect(modFromClient[1]).not.toBe(modFromServer[1])
})
it('should be able to navigate between rsc routes', async () => {
const browser = await webdriver(next.url, '/root')
await browser.waitForElementByCss('#goto-next-link').click()
await new Promise((res) => setTimeout(res, 1000))
await check(() => browser.url(), `${next.url}/next-api/link`)
await browser.waitForElementByCss('#goto-home').click()
await new Promise((res) => setTimeout(res, 1000))
await check(() => browser.url(), `${next.url}/root`)
const content = await browser.elementByCss('body').text()
expect(content).toContain('component:root.server')
await browser.waitForElementByCss('#goto-streaming-rsc').click()
// Wait for navigation and streaming to finish.
await check(
() => browser.elementByCss('#content').text(),
'next_streaming_data'
)
expect(await browser.url()).toBe(`${next.url}/streaming-rsc`)
})
it('should handle streaming server components correctly', async () => {
const browser = await webdriver(next.url, '/streaming-rsc')
const content = await browser.eval(
`document.querySelector('#content').innerText`
)
expect(content).toMatchInlineSnapshot('"next_streaming_data"')
})
it('should support next/link in server components', async () => {
const linkHTML = await renderViaHTTP(next.url, '/next-api/link')
const linkText = getNodeBySelector(linkHTML, 'body a[href="/root"]').text()
expect(linkText).toContain('home')
const browser = await webdriver(next.url, '/next-api/link')
// We need to make sure the app is fully hydrated before clicking, otherwise
// it will be a full redirection instead of being taken over by the next
// router. This timeout prevents it being flaky caused by fast refresh's
// rebuilding event.
await new Promise((res) => setTimeout(res, 1000))
await browser.eval('window.beforeNav = 1')
await browser.waitForElementByCss('#next_id').click()
await check(() => browser.elementByCss('#query').text(), 'query:1')
await browser.waitForElementByCss('#next_id').click()
await check(() => browser.elementByCss('#query').text(), 'query:2')
if (isNextDev) {
expect(await browser.eval('window.beforeNav')).toBe(1)
}
})
it('should refresh correctly with next/link', async () => {
// Select the button which is not hidden but rendered
const selector = '#goto-next-link'
let hasFlightRequest = false
const browser = await webdriver(next.url, '/root', {
beforePageLoad(page) {
page.on('request', (request) => {
const url = request.url()
if (/\?__flight__=1/.test(url)) {
hasFlightRequest = true
}
})
},
})
// wait for hydration
await new Promise((res) => setTimeout(res, 1000))
if (isNextDev) {
expect(hasFlightRequest).toBe(false)
}
await browser.elementByCss(selector).click()
// wait for re-hydration
if (isNextDev) {
await check(
() => (hasFlightRequest ? 'success' : hasFlightRequest),
'success'
)
}
const refreshText = await browser.elementByCss(selector).text()
expect(refreshText).toBe('next link')
})
it('should escape streaming data correctly', async () => {
const browser = await webdriver(next.url, '/escaping-rsc')
const manipulated = await browser.eval(`window.__manipulated_by_injection`)
expect(manipulated).toBe(undefined)
})
it('should render built-in 404 page for missing route if pagesDir is not presented', async () => {
const res = await fetchViaHTTP(next.url, '/does-not-exist')
expect(res.status).toBe(404)
const html = await res.text()
expect(html).toContain('This page could not be found')
})
it('should suspense next/image in server components', async () => {
const imageHTML = await renderViaHTTP(next.url, '/next-api/image')
const imageTag = getNodeBySelector(imageHTML, '#myimg')
expect(imageTag.attr('src')).toContain('data:image')
})
it('should handle external async module libraries correctly', async () => {
const html = await renderViaHTTP(next.url, '/external-imports')
expect(html).toContain('module type:esm-export')
expect(html).toContain('export named:named')
expect(html).toContain('export value:123')
expect(html).toContain('export array:4,5,6')
expect(html).toContain('export object:{x:1}')
})
it('should handle various kinds of exports correctly', async () => {
const html = await renderViaHTTP(next.url, '/various-exports')
const content = getNodeBySelector(html, 'body').text()
expect(content).toContain('abcde')
expect(content).toContain('default-export-arrow.client')
expect(content).toContain('named.client')
const browser = await webdriver(next.url, '/various-exports')
const hydratedContent = await browser.waitForElementByCss('body').text()
expect(hydratedContent).toContain('abcde')
expect(hydratedContent).toContain('default-export-arrow.client')
expect(hydratedContent).toContain('named.client')
expect(hydratedContent).toContain('cjs-shared')
expect(hydratedContent).toContain('cjs-client')
expect(hydratedContent).toContain('Export All: one, two, two')
})
it('should support native modules in server component', async () => {
const html = await renderViaHTTP(next.url, '/native-module')
const content = getNodeBySelector(html, 'body').text()
expect(content).toContain('fs: function')
expect(content).toContain('foo.client')
})
it('should support the re-export syntax in server component', async () => {
const html = await renderViaHTTP(next.url, '/shared')
const content = getNodeBySelector(html, '#bar').text()
expect(content).toContain('bar.server.js:')
})
it('should render initial styles of css-in-js in SSR correctly', async () => {
const html = await renderViaHTTP(next.url, '/css-in-js')
const head = getNodeBySelector(html, 'head').html()
// from styled-jsx
expect(head).toMatch(/{color:(\s*)purple;?}/) // styled-jsx/style
expect(head).toMatch(/{color:(\s*)hotpink;?}/) // styled-jsx/css
// from styled-components
expect(head).toMatch(/{color:(\s*)blue;?}/)
})
it('should support streaming for flight response', async () => {
await fetchViaHTTP(next.url, '/?__flight__=1').then(async (response) => {
const result = await resolveStreamResponse(response)
expect(result).toContain('component:index.server')
})
})
it('should support partial hydration with inlined server data', async () => {
await fetchViaHTTP(next.url, '/partial-hydration', null, {}).then(
async (response) => {
let gotFallback = false
let gotData = false
let gotInlinedData = false
await resolveStreamResponse(response, (_, result) => {
gotInlinedData = result.includes('self.__next_s=')
gotData = result.includes('next_streaming_data')
if (!gotFallback) {
gotFallback = result.includes('next_streaming_fallback')
if (gotFallback) {
expect(gotData).toBe(false)
expect(gotInlinedData).toBe(false)
}
}
})
expect(gotFallback).toBe(true)
expect(gotData).toBe(true)
expect(gotInlinedData).toBe(true)
}
)
})
// disable this flaky test
it.skip('should support partial hydration with inlined server data in browser', async () => {
// Should end up with "next_streaming_data".
const browser = await webdriver(next.url, '/partial-hydration', {
waitHydration: false,
})
const content = await browser.eval(`window.document.body.innerText`)
expect(content).toContain('next_streaming_data')
// Should support partial hydration: the boundary should still be pending
// while another part is hydrated already.
expect(await browser.eval(`window.partial_hydration_suspense_result`)).toBe(
'next_streaming_fallback'
)
expect(await browser.eval(`window.partial_hydration_counter_result`)).toBe(
'count: 1'
)
})
if (!isNextDev) {
it('should generate edge SSR manifests for Node.js', async () => {
const requiredServerFiles = (
await fs.readJSON(path.join(distDir, 'required-server-files.json'))
).files
const files = [
'server/middleware-build-manifest.js',
'edge/middleware-manifest.json',
'server/flight-manifest.json',
]
files.forEach((file) => {
const filepath = path.join(distDir, file)
expect(fs.existsSync(filepath)).toBe(true)
})
requiredServerFiles.forEach((file) => {
const requiredFilePath = path.join(next.testDir, file)
expect(fs.existsSync(requiredFilePath)).toBe(true)
})
})
}
})