refactor: auto-install `@types/react` only if `react` is installed #68928

devjiwonchoi · 2024-08-15T07:13:54Z

Why?

If react is not installed in the project, it does not require @types/react either.
This could happen when the user tries to run a headless Next.js app that does not require react.

Also, we are working on adding a create-next-app template for the case above.

x-ref: #68118

Closes NDX-220

ijjk · 2024-08-15T07:20:47Z

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js refac/install-types-react-only-if-react-is-installed	Change
buildDuration	17.3s	17.3s	N/A
buildDurationCached	8.5s	7.7s	N/A
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Client Bundles (main, webpack)

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Legacy Client Bundles (polyfills)

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polyfills-HASH.js gzip	31 kB	31 kB	✓
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_buildManifest.js gzip	747 B	749 B	N/A
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Rendered Page Sizes

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link.html gzip	538 B	538 B	✓
withRouter.html gzip	520 B	520 B	✓
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Edge SSR bundle Size

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edge-ssr.js gzip	128 kB	127 kB	N/A
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Middleware size

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Next Runtimes

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build cache Overall increase ⚠️

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Commit: bef71a0

eps1lon · 2024-08-15T07:58:39Z

Do we even support a Next.js app without React installed? This should come with a test.

ijjk · 2024-08-15T19:55:23Z

Failing test suites

Commit: bef71a0

TURBOPACK=1 pnpm test-dev test/development/middleware-errors/index.test.ts (turbopack)

middleware - development errors > when there is a compilation error after boot > logs the error correctly

Expand output

● middleware - development errors › when there is a compilation error after boot › logs the error correctly

TIMED OUT: success

undefined

Error: expect(received).toContain(expected) // indexOf

Expected substring: "Expected '{', got '}'"
Received string:    "  ▲ Next.js 15.0.0-canary.123 (turbo)
  - Local:        http://localhost:36921·
 ✓ Starting...
Creating turbopack project {
  dir: '/tmp/next-install-a8d852faf60ae470f359ecddbd9a7fdc5fb3f62cac28648c4511ca3933032ceb',
  testMode: true
}
 ✓ Compiled in 105ms
 ✓ Ready in 534ms
 ✓ Compiled in 2ms
 ○ Compiling middleware ...
 ✓ Compiled middleware in 580ms
 ✓ Compiled /_error in 77ms
 GET / 500 in 735ms
"

  718 |
  719 |   if (hardError) {
> 720 |     throw new Error('TIMED OUT: ' + regex + '\n\n' + content + '\n\n' + lastErr)
      |           ^
  721 |   }
  722 |   return false
  723 | }

  at check (lib/next-test-utils.ts:720:11)
  at Object.<anonymous> (development/middleware-errors/index.test.ts:294:7)

Read more about building and testing Next.js in contributing.md.

TURBOPACK=1 pnpm test-start test/production/ci-missing-typescript-deps/index.test.ts (turbopack)

ci-missing-typescript-deps > should not throw an error if beta version of @types/react and @types/react-dom is installed

Expand output

● ci-missing-typescript-deps › should not throw an error if beta version of @types/react and @types/react-dom is installed

expect(received).toContain(expected) // indexOf

Expected substring: "We detected TypeScript in your project and created"
Received string:    "⚠ No build cache found. Please configure build caching for faster rebuilds. Read more: https://nextjs.org/docs/messages/no-cache
  ▲ Next.js 15.0.0-canary.123 (turbo)·
   Linting and checking validity of types ...
It looks like you're trying to use TypeScript but do not have the required package(s) installed.·
Please install react and react-dom by running:·
	pnpm install --save-dev react react-dom·
If you are not trying to use TypeScript, please remove the tsconfig.json file from your package root (and any TypeScript files in your pages directory).·
"

  69 |     try {
  70 |       const nextBuild = await next.build()
> 71 |       expect(nextBuild.cliOutput).toContain(
     |                                   ^
  72 |         // matching the part of the success message that isn't colored.
  73 |         `We detected TypeScript in your project and created`
  74 |       )

  at Object.toContain (production/ci-missing-typescript-deps/index.test.ts:71:35)

Read more about building and testing Next.js in contributing.md.

TURBOPACK=1 pnpm test-start test/production/app-dir/app-fetch-build-cache/app-fetch-build-cache.test.ts (turbopack)

app fetch build cache > should not use stale data if present

Expand output

● app fetch build cache › should not use stale data if present

next build failed with code/signal 1

   98 |           if (code || signal)
   99 |             reject(
> 100 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  101 |             )
  102 |           else resolve()
  103 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:100:15)

Read more about building and testing Next.js in contributing.md.

TURBOPACK=1 pnpm test-start test/production/sharp-basic/sharp-basic.test.ts (turbopack)

sharp support with hasNextSupport > should work using cheerio

Expand output

● sharp support with hasNextSupport › should work using cheerio

next build failed with code/signal 1

   98 |           if (code || signal)
   99 |             reject(
> 100 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  101 |             )
  102 |           else resolve()
  103 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:100:15)

Read more about building and testing Next.js in contributing.md.

pnpm test-start test/production/app-dir/fetch-cache/fetch-cache.test.ts

fetch-cache > should have correct fetchUrl field for fetches and unstable_cache
fetch-cache > should retry 3 times when revalidate times out
fetch-cache > should not retry for failed fetch-cache GET

Expand output

● fetch-cache › should have correct fetchUrl field for fetches and unstable_cache

next build failed with code/signal 1

   98 |           if (code || signal)
   99 |             reject(
> 100 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  101 |             )
  102 |           else resolve()
  103 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:100:15)

● fetch-cache › should retry 3 times when revalidate times out

next build failed with code/signal 1

   98 |           if (code || signal)
   99 |             reject(
> 100 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  101 |             )
  102 |           else resolve()
  103 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:100:15)

● fetch-cache › should not retry for failed fetch-cache GET

next build failed with code/signal 1

   98 |           if (code || signal)
   99 |             reject(
> 100 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  101 |             )
  102 |           else resolve()
  103 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:100:15)

● Test suite failed to run

TypeError: Cannot read properties of undefined (reading 'destroy')

  170 |   })
  171 |   afterAll(async () => {
> 172 |     await next.destroy()
      |                ^
  173 |     if (fetchCacheServer) fetchCacheServer.close()
  174 |     if (nextInstance) await killApp(nextInstance)
  175 |   })

  at Object.destroy (production/app-dir/fetch-cache/fetch-cache.test.ts:172:16)

Read more about building and testing Next.js in contributing.md.

samcx · 2024-08-15T21:41:38Z

Curious, should we also consider @types/react-dom? Also curious whether @types/node is needed or not.

eps1lon · 2024-08-16T15:58:02Z

test/e2e/app-dir/no-react/no-react.test.ts

+  const { next } = nextTestSetup({
+    files: __dirname,
+    installCommand: 'pnpm remove react react-dom',
+  })
+
+  it('should work using cheerio without react, react-dom', async () => {
+    const $ = await next.render$('/')
+    expect($('p').text()).toBe('hello world')
+  })


How does this test work? Shouldn't it just do a regular pnpm dev and then check no react or @types/react is in dependencies or devDependencies?

Since we always install react and react-dom, this manually removes after install.

next.js/test/lib/next-modes/base.ts

Lines 167 to 176 in e101bd8

const finalDependencies = {

react: reactVersion,

'react-dom': reactVersion,

'@types/react': 'latest',

'@types/react-dom': 'latest',

typescript: 'latest',

'@types/node': 'latest',

...this.dependencies,

...this.packageJson?.dependencies,

}

But where in the assertion do I see that?

devjiwonchoi · 2024-08-17T03:26:14Z

@samcx Will add @types/react-dom on the next stack, and for @types/node, I think we should leave as is since the type is necessary for calling functions like fs.

eps1lon · 2024-08-19T08:27:17Z

test/e2e/app-dir/no-react/no-react.test.ts

+  it('should not have react or react-dom in the package.json', async () => {
+    const packageJson = await next.readJSON('package.json')
+    expect(packageJson.dependencies).toHaveProperty('next')
+    expect(packageJson.dependencies).not.toHaveProperty('react')


This isn't testing Next.js behavior. You're manually removing react and react-dom so obviously it's not in the package.json.

Let's do this by the books and add a commit testing the existing behavior and another commit making the change and updating that test so that we know what we actually changed.

When the project is using TypeScript, we auto-installed `@types/react` but not `@types/react-dom`, so we install it as well if `react` exists in the project.

devjiwonchoi · 2024-08-21T17:25:00Z

Since we have to modify route definitions (.next/types/app/...) as well, I find this inadequate to implement for Next.js where an alternate is simply installing @types/react.

ijjk added created-by: Next.js team PRs by the Next.js team. type: next labels Aug 15, 2024

devjiwonchoi marked this pull request as ready for review August 15, 2024 07:48

devjiwonchoi requested review from ztanner, huozhi, eps1lon, ijjk and samcx August 15, 2024 07:49

ijjk added the tests label Aug 15, 2024

devjiwonchoi force-pushed the refac/install-types-react-only-if-react-is-installed branch from 1f39cfc to 90181d4 Compare August 15, 2024 19:54

devjiwonchoi added 2 commits August 16, 2024 04:55

refactor: install types-react only if react is installed

8ef8985

add no react test

e3b574f

devjiwonchoi force-pushed the refac/install-types-react-only-if-react-is-installed branch from 90181d4 to e3b574f Compare August 15, 2024 19:56

devjiwonchoi mentioned this pull request Aug 15, 2024

Add --api Flag to Create Headless API App with create-next-app #68130

Open

eps1lon reviewed Aug 16, 2024

View reviewed changes

test: check if react, react-dom does not exist

1ff3135

devjiwonchoi mentioned this pull request Aug 17, 2024

chore: auto-install @types/react-dom when react is installed #69001

Merged

eps1lon reviewed Aug 19, 2024

View reviewed changes

devjiwonchoi added 3 commits August 21, 2024 19:02

chore: auto-install @types/react-dom when react is installed (#69001)

86bb991

When the project is using TypeScript, we auto-installed `@types/react` but not `@types/react-dom`, so we install it as well if `react` exists in the project.

reduce op

d5fca50

skipped dependencies

bef71a0

devjiwonchoi closed this Aug 21, 2024

devjiwonchoi deleted the refac/install-types-react-only-if-react-is-installed branch August 21, 2024 17:25

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refactor: auto-install `@types/react` only if `react` is installed #68928

refactor: auto-install `@types/react` only if `react` is installed #68928

devjiwonchoi commented Aug 15, 2024 •

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ijjk commented Aug 15, 2024 •

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eps1lon Aug 16, 2024

devjiwonchoi Aug 17, 2024

eps1lon Aug 19, 2024

devjiwonchoi commented Aug 17, 2024

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devjiwonchoi commented Aug 21, 2024

	const finalDependencies = {
	react: reactVersion,
	'react-dom': reactVersion,
	'@types/react': 'latest',
	'@types/react-dom': 'latest',
	typescript: 'latest',
	'@types/node': 'latest',
	...this.dependencies,
	...this.packageJson?.dependencies,
	}

refactor: auto-install @types/react only if react is installed #68928

refactor: auto-install @types/react only if react is installed #68928

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devjiwonchoi commented Aug 15, 2024 • edited Loading

Why?

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Failing test suites

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devjiwonchoi commented Aug 21, 2024

refactor: auto-install `@types/react` only if `react` is installed #68928

refactor: auto-install `@types/react` only if `react` is installed #68928

devjiwonchoi commented Aug 15, 2024 •

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ijjk commented Aug 15, 2024 •

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ijjk commented Aug 15, 2024 •

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samcx commented Aug 15, 2024 •

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