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hmr.test.ts
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import { join } from 'path'
import cheerio from 'cheerio'
import webdriver from 'next-webdriver'
import {
check,
getBrowserBodyText,
getRedboxHeader,
getRedboxSource,
hasRedbox,
renderViaHTTP,
waitFor,
} from 'next-test-utils'
import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'test/lib/next-modes/base'
describe('basic HMR', () => {
let next: NextInstance
beforeAll(async () => {
next = await createNext({
files: {
pages: new FileRef(join(__dirname, 'hmr/pages')),
components: new FileRef(join(__dirname, 'hmr/components')),
},
})
})
afterAll(() => next.destroy())
it('should show hydration error correctly', async () => {
const browser = await webdriver(next.url, '/hydration-error')
await check(async () => {
const logs = await browser.log()
return logs.some((log) =>
log.message.includes('messages/react-hydration-error')
)
? 'success'
: JSON.stringify(logs, null, 2)
}, 'success')
})
it('should have correct router.isReady for auto-export page', async () => {
let browser = await webdriver(next.url, '/auto-export-is-ready')
expect(await browser.elementByCss('#ready').text()).toBe('yes')
expect(JSON.parse(await browser.elementByCss('#query').text())).toEqual({})
browser = await webdriver(next.url, '/auto-export-is-ready?hello=world')
await check(async () => {
return browser.elementByCss('#ready').text()
}, 'yes')
expect(JSON.parse(await browser.elementByCss('#query').text())).toEqual({
hello: 'world',
})
})
it('should have correct router.isReady for getStaticProps page', async () => {
let browser = await webdriver(next.url, '/gsp-is-ready')
expect(await browser.elementByCss('#ready').text()).toBe('yes')
expect(JSON.parse(await browser.elementByCss('#query').text())).toEqual({})
browser = await webdriver(next.url, '/gsp-is-ready?hello=world')
await check(async () => {
return browser.elementByCss('#ready').text()
}, 'yes')
expect(JSON.parse(await browser.elementByCss('#query').text())).toEqual({
hello: 'world',
})
})
describe('Hot Module Reloading', () => {
describe('delete a page and add it back', () => {
it('should load the page properly', async () => {
const contactPagePath = join('pages', 'hmr', 'contact.js')
const newContactPagePath = join('pages', 'hmr', '_contact.js')
let browser
try {
const start = next.cliOutput.length
browser = await webdriver(next.appPort, '/hmr/contact')
const text = await browser.elementByCss('p').text()
expect(text).toBe('This is the contact page.')
// Rename the file to mimic a deleted page
await next.renameFile(contactPagePath, newContactPagePath)
await check(
() => getBrowserBodyText(browser),
/This page could not be found/
)
// Rename the file back to the original filename
await next.renameFile(newContactPagePath, contactPagePath)
// wait until the page comes back
await check(
() => getBrowserBodyText(browser),
/This is the contact page/
)
expect(next.cliOutput.slice(start)).toContain('compiling...')
expect(next.cliOutput.slice(start)).toContain(
'compiling /hmr/contact (client and server)...'
)
expect(next.cliOutput).toContain(
'compiling /_error (client and server)...'
)
} finally {
if (browser) {
await browser.close()
}
await next
.renameFile(newContactPagePath, contactPagePath)
.catch(() => {})
}
})
})
describe('editing a page', () => {
it('should detect the changes and display it', async () => {
let browser
try {
browser = await webdriver(next.appPort, '/hmr/about')
const text = await browser.elementByCss('p').text()
expect(text).toBe('This is the about page.')
const aboutPagePath = join('pages', 'hmr', 'about.js')
const originalContent = await next.readFile(aboutPagePath)
const editedContent = originalContent.replace(
'This is the about page',
'COOL page'
)
// change the content
try {
await next.patchFile(aboutPagePath, editedContent)
await check(() => getBrowserBodyText(browser), /COOL page/)
} finally {
// add the original content
await next.patchFile(aboutPagePath, originalContent)
}
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
} finally {
if (browser) {
await browser.close()
}
}
})
it('should not reload unrelated pages', async () => {
let browser
try {
browser = await webdriver(next.appPort, '/hmr/counter')
const text = await browser
.elementByCss('button')
.click()
.elementByCss('button')
.click()
.elementByCss('p')
.text()
expect(text).toBe('COUNT: 2')
const aboutPagePath = join('pages', 'hmr', 'about.js')
const originalContent = await next.readFile(aboutPagePath)
const editedContent = originalContent.replace(
'This is the about page',
'COOL page'
)
try {
// Change the about.js page
await next.patchFile(aboutPagePath, editedContent)
// Check whether the this page has reloaded or not.
await check(() => browser.elementByCss('p').text(), /COUNT: 2/)
} finally {
// restore the about page content.
await next.patchFile(aboutPagePath, originalContent)
}
} finally {
if (browser) {
await browser.close()
}
}
})
// Added because of a regression in react-hot-loader, see issues: #4246 #4273
// Also: https://github.com/vercel/styled-jsx/issues/425
it('should update styles correctly', async () => {
let browser
try {
browser = await webdriver(next.appPort, '/hmr/style')
const pTag = await browser.elementByCss('.hmr-style-page p')
const initialFontSize = await pTag.getComputedCss('font-size')
expect(initialFontSize).toBe('100px')
const pagePath = join('pages', 'hmr', 'style.js')
const originalContent = await next.readFile(pagePath)
const editedContent = originalContent.replace('100px', '200px')
// Change the page
await next.patchFile(pagePath, editedContent)
try {
// Check whether the this page has reloaded or not.
await check(async () => {
const editedPTag = await browser.elementByCss('.hmr-style-page p')
return editedPTag.getComputedCss('font-size')
}, /200px/)
} finally {
// Finally is used so that we revert the content back to the original regardless of the test outcome
// restore the about page content.
await next.patchFile(pagePath, originalContent)
}
} finally {
if (browser) {
await browser.close()
}
}
})
// Added because of a regression in react-hot-loader, see issues: #4246 #4273
// Also: https://github.com/vercel/styled-jsx/issues/425
it('should update styles in a stateful component correctly', async () => {
let browser
const pagePath = join('pages', 'hmr', 'style-stateful-component.js')
const originalContent = await next.readFile(pagePath)
try {
browser = await webdriver(
next.appPort,
'/hmr/style-stateful-component'
)
const pTag = await browser.elementByCss('.hmr-style-page p')
const initialFontSize = await pTag.getComputedCss('font-size')
expect(initialFontSize).toBe('100px')
const editedContent = originalContent.replace('100px', '200px')
// Change the page
await next.patchFile(pagePath, editedContent)
// Check whether the this page has reloaded or not.
await check(async () => {
const editedPTag = await browser.elementByCss('.hmr-style-page p')
return editedPTag.getComputedCss('font-size')
}, /200px/)
} finally {
if (browser) {
await browser.close()
}
await next.patchFile(pagePath, originalContent)
}
})
// Added because of a regression in react-hot-loader, see issues: #4246 #4273
// Also: https://github.com/vercel/styled-jsx/issues/425
it('should update styles in a dynamic component correctly', async () => {
let browser = null
let secondBrowser = null
const pagePath = join('components', 'hmr', 'dynamic.js')
const originalContent = await next.readFile(pagePath)
try {
browser = await webdriver(
next.appPort,
'/hmr/style-dynamic-component'
)
const div = await browser.elementByCss('#dynamic-component')
const initialClientClassName = await div.getAttribute('class')
const initialFontSize = await div.getComputedCss('font-size')
expect(initialFontSize).toBe('100px')
const initialHtml = await renderViaHTTP(
next.appPort,
'/hmr/style-dynamic-component'
)
expect(initialHtml.includes('100px')).toBeTruthy()
const $initialHtml = cheerio.load(initialHtml)
const initialServerClassName =
$initialHtml('#dynamic-component').attr('class')
expect(initialClientClassName === initialServerClassName).toBeTruthy()
const editedContent = originalContent.replace('100px', '200px')
// Change the page
await next.patchFile(pagePath, editedContent)
// wait for 5 seconds
await waitFor(5000)
secondBrowser = await webdriver(
next.appPort,
'/hmr/style-dynamic-component'
)
// Check whether the this page has reloaded or not.
const editedDiv = await secondBrowser.elementByCss(
'#dynamic-component'
)
const editedClientClassName = await editedDiv.getAttribute('class')
const editedFontSize = await editedDiv.getComputedCss('font-size')
const browserHtml = await secondBrowser.eval(
'document.documentElement.innerHTML'
)
expect(editedFontSize).toBe('200px')
expect(browserHtml.includes('font-size:200px')).toBe(true)
expect(browserHtml.includes('font-size:100px')).toBe(false)
const editedHtml = await renderViaHTTP(
next.appPort,
'/hmr/style-dynamic-component'
)
expect(editedHtml.includes('200px')).toBeTruthy()
const $editedHtml = cheerio.load(editedHtml)
const editedServerClassName =
$editedHtml('#dynamic-component').attr('class')
expect(editedClientClassName === editedServerClassName).toBe(true)
} finally {
// Finally is used so that we revert the content back to the original regardless of the test outcome
// restore the about page content.
await next.patchFile(pagePath, originalContent)
if (browser) {
await browser.close()
}
if (secondBrowser) {
secondBrowser.close()
}
}
})
})
})
describe('Error Recovery', () => {
it('should recover from 404 after a page has been added', async () => {
let browser
const newPage = join('pages', 'hmr', 'new-page.js')
try {
const start = next.cliOutput.length
browser = await webdriver(next.appPort, '/hmr/new-page')
expect(await browser.elementByCss('body').text()).toMatch(
/This page could not be found/
)
// Add the page
await next.patchFile(
newPage,
'export default () => (<div id="new-page">the-new-page</div>)'
)
await check(() => getBrowserBodyText(browser), /the-new-page/)
await next.deleteFile(newPage)
await check(
() => getBrowserBodyText(browser),
/This page could not be found/
)
expect(next.cliOutput.slice(start)).toContain(
'compiling /hmr/new-page (client and server)...'
)
expect(next.cliOutput).toContain(
'compiling /_error (client and server)...'
)
} catch (err) {
await next.deleteFile(newPage)
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should detect syntax errors and recover', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about2.js')
const aboutContent = await next.readFile(aboutPage)
try {
const start = next.cliOutput.length
browser = await webdriver(next.appPort, '/hmr/about2')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(aboutPage, aboutContent.replace('</div>', 'div'))
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxSource(browser)).toMatch(/Unexpected eof/)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
expect(next.cliOutput.slice(start)).toContain(
'compiling /hmr/about2 (client and server)...'
)
expect(next.cliOutput).toContain(
'compiling /_error (client and server)...'
)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should show the error on all pages', async () => {
const aboutPage = join('pages', 'hmr', 'about2.js')
const aboutContent = await next.readFile(aboutPage)
let browser
try {
await renderViaHTTP(next.appPort, '/hmr/about2')
await next.patchFile(aboutPage, aboutContent.replace('</div>', 'div'))
// Ensure dev server has time to break:
await new Promise((resolve) => setTimeout(resolve, 2000))
browser = await webdriver(next.appPort, '/hmr/contact')
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxSource(browser)).toMatch(/Unexpected eof/)
await next.patchFile(aboutPage, aboutContent)
await check(
() => getBrowserBodyText(browser),
/This is the contact page/
)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the contact page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should detect runtime errors on the module scope', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about3.js')
const aboutContent = await next.readFile(aboutPage)
try {
browser = await webdriver(next.appPort, '/hmr/about3')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(
aboutPage,
aboutContent.replace('export', 'aa=20;\nexport')
)
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxHeader(browser)).toMatch(/aa is not defined/)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
} finally {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await browser.close()
}
}
})
it('should recover from errors in the render function', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about4.js')
const aboutContent = await next.readFile(aboutPage)
try {
browser = await webdriver(next.appPort, '/hmr/about4')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(
aboutPage,
aboutContent.replace(
'return',
'throw new Error("an-expected-error");\nreturn'
)
)
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxSource(browser)).toMatch(/an-expected-error/)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should recover after exporting an invalid page', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about5.js')
const aboutContent = await next.readFile(aboutPage)
try {
browser = await webdriver(next.appPort, '/hmr/about5')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(
aboutPage,
aboutContent.replace(
'export default',
'export default {};\nexport const fn ='
)
)
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxHeader(browser)).toMatchInlineSnapshot(`
" 1 of 1 unhandled error
Server Error
Error: The default export is not a React Component in page: \\"/hmr/about5\\"
This error happened while generating the page. Any console logs will be displayed in the terminal window."
`)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should recover after a bad return from the render function', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about6.js')
const aboutContent = await next.readFile(aboutPage)
try {
browser = await webdriver(next.appPort, '/hmr/about6')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(
aboutPage,
aboutContent.replace(
'export default',
'export default () => /search/;\nexport const fn ='
)
)
const isReact17 = process.env.NEXT_TEST_REACT_VERSION === '^17'
expect(await hasRedbox(browser)).toBe(true)
// TODO: Replace this when webpack 5 is the default
expect(
(await getRedboxHeader(browser)).replace(
'__WEBPACK_DEFAULT_EXPORT__',
'Unknown'
)
).toMatch(
`Objects are not valid as a React child (found: ${
isReact17 ? '/search/' : '[object RegExp]'
}). If you meant to render a collection of children, use an array instead.`
)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should recover after undefined exported as default', async () => {
let browser
const aboutPage = join('pages', 'hmr', 'about7.js')
const aboutContent = await next.readFile(aboutPage)
try {
browser = await webdriver(next.appPort, '/hmr/about7')
await check(() => getBrowserBodyText(browser), /This is the about page/)
await next.patchFile(
aboutPage,
aboutContent.replace(
'export default',
'export default undefined;\nexport const fn ='
)
)
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxHeader(browser)).toMatchInlineSnapshot(`
" 1 of 1 unhandled error
Server Error
Error: The default export is not a React Component in page: \\"/hmr/about7\\"
This error happened while generating the page. Any console logs will be displayed in the terminal window."
`)
await next.patchFile(aboutPage, aboutContent)
await check(() => getBrowserBodyText(browser), /This is the about page/)
expect(await hasRedbox(browser, false)).toBe(false)
} catch (err) {
await next.patchFile(aboutPage, aboutContent)
if (browser) {
await check(
() => getBrowserBodyText(browser),
/This is the about page/
)
}
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should recover from errors in getInitialProps in client', async () => {
let browser
const erroredPage = join('pages', 'hmr', 'error-in-gip.js')
const errorContent = await next.readFile(erroredPage)
try {
browser = await webdriver(next.appPort, '/hmr')
await browser.elementByCss('#error-in-gip-link').click()
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxHeader(browser)).toMatchInlineSnapshot(`
" 1 of 1 unhandled error
Unhandled Runtime Error
Error: an-expected-error-in-gip"
`)
await next.patchFile(
erroredPage,
errorContent.replace('throw error', 'return {}')
)
await check(() => getBrowserBodyText(browser), /Hello/)
await next.patchFile(erroredPage, errorContent)
await check(async () => {
await browser.refresh()
await waitFor(2000)
const text = await getBrowserBodyText(browser)
if (text.includes('Hello')) {
throw new Error('waiting')
}
return getRedboxSource(browser)
}, /an-expected-error-in-gip/)
} catch (err) {
await next.patchFile(erroredPage, errorContent)
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
it('should recover after an error reported via SSR', async () => {
let browser
const erroredPage = join('pages', 'hmr', 'error-in-gip.js')
const errorContent = await next.readFile(erroredPage)
try {
browser = await webdriver(next.appPort, '/hmr/error-in-gip')
expect(await hasRedbox(browser)).toBe(true)
expect(await getRedboxHeader(browser)).toMatchInlineSnapshot(`
" 1 of 1 unhandled error
Server Error
Error: an-expected-error-in-gip
This error happened while generating the page. Any console logs will be displayed in the terminal window."
`)
const erroredPage = join('pages', 'hmr', 'error-in-gip.js')
await next.patchFile(
erroredPage,
errorContent.replace('throw error', 'return {}')
)
await check(() => getBrowserBodyText(browser), /Hello/)
await next.patchFile(erroredPage, errorContent)
await check(async () => {
await browser.refresh()
await waitFor(2000)
const text = await getBrowserBodyText(browser)
if (text.includes('Hello')) {
throw new Error('waiting')
}
return getRedboxSource(browser)
}, /an-expected-error-in-gip/)
} catch (err) {
await next.patchFile(erroredPage, errorContent)
throw err
} finally {
if (browser) {
await browser.close()
}
}
})
})
describe('Full reload', () => {
it('should warn about full reload in cli output - anonymous page function', async () => {
const start = next.cliOutput.length
const browser = await webdriver(
next.appPort,
`/hmr/anonymous-page-function`
)
expect(await browser.elementByCss('p').text()).toBe('hello world')
expect(next.cliOutput.slice(start)).not.toContain(
'Fast Refresh had to perform a full reload. Read more: https://nextjs.org/docs/basic-features/fast-refresh#how-it-works'
)
const currentFileContent = await next.readFile(
'./pages/hmr/anonymous-page-function.js'
)
const newFileContent = currentFileContent.replace(
'<p>hello world</p>',
'<p>hello world!!!</p>'
)
await next.patchFile(
'./pages/hmr/anonymous-page-function.js',
newFileContent
)
await check(() => browser.elementByCss('p').text(), 'hello world!!!')
// CLI warning and stacktrace
expect(next.cliOutput.slice(start)).toContain(
'Fast Refresh had to perform a full reload. Read more: https://nextjs.org/docs/basic-features/fast-refresh#how-it-works'
)
expect(next.cliOutput.slice(start)).toContain(
'Error: Aborted because ./pages/hmr/anonymous-page-function.js is not accepted'
)
// Browser warning
const browserLogs = await browser.log()
expect(
browserLogs.some(({ message }) =>
message.includes(
"Fast Refresh will perform a full reload when you edit a file that's imported by modules outside of the React rendering tree."
)
)
).toBeTruthy()
})
it('should warn about full reload in cli output - runtime-error', async () => {
const start = next.cliOutput.length
const browser = await webdriver(next.appPort, `/hmr/runtime-error`)
await check(
() => getRedboxHeader(browser),
/ReferenceError: whoops is not defined/
)
expect(next.cliOutput.slice(start)).not.toContain(
'Fast Refresh had to perform a full reload. Read more: https://nextjs.org/docs/basic-features/fast-refresh#how-it-works'
)
const currentFileContent = await next.readFile(
'./pages/hmr/runtime-error.js'
)
const newFileContent = currentFileContent.replace('whoops', '"whoops"')
await next.patchFile('./pages/hmr/runtime-error.js', newFileContent)
await check(() => browser.elementByCss('body').text(), 'whoops')
// CLI warning and stacktrace
expect(next.cliOutput.slice(start)).toContain(
'Fast Refresh had to perform a full reload. Read more: https://nextjs.org/docs/basic-features/fast-refresh#how-it-works'
)
expect(next.cliOutput.slice(start)).not.toContain(
'Error: Aborted because ./pages/runtime-error.js is not accepted'
)
// Browser warning
const browserLogs = await browser.log()
expect(
browserLogs.some(({ message }) =>
message.includes(
'[Fast Refresh] performing full reload because your application had an unrecoverable error'
)
)
).toBeTruthy()
})
})
it('should have client HMR events in trace file', async () => {
const traceData = await next.readFile('.next/trace')
expect(traceData).toContain('client-hmr-latency')
expect(traceData).toContain('client-error')
expect(traceData).toContain('client-success')
expect(traceData).toContain('client-full-reload')
})
it('should have correct compile timing after fixing error', async () => {
const pageName = 'pages/auto-export-is-ready.js'
const originalContent = await next.readFile(pageName)
try {
const browser = await webdriver(next.url, '/auto-export-is-ready')
const outputLength = next.cliOutput.length
await next.patchFile(
pageName,
`import hello from 'non-existent'\n` + originalContent
)
expect(await hasRedbox(browser, true)).toBe(true)
await waitFor(3000)
await next.patchFile(pageName, originalContent)
await check(
() => next.cliOutput.substring(outputLength),
/compiled.*?successfully/i
)
const compileTime = next.cliOutput
.substring(outputLength)
.match(/compiled.*?successfully in ([\d.]{1,})\s?(?:s|ms)/i)
let compileTimeMs = parseFloat(compileTime[1])
if (
next.cliOutput
.substring(outputLength)
.match(/compiled.*?successfully in ([\d.]{1,})\s?s/)
) {
compileTimeMs = compileTimeMs * 1000
}
expect(compileTimeMs).toBeLessThan(3000)
} finally {
await next.patchFile(pageName, originalContent)
}
})
})