Warn in dev mode when script tags are added with next/head #33968

kara · 2022-02-04T02:29:57Z

This commit adds a development mode warning in the console
if you try to include <script> tags in next/head, e.g.

<Head>
  <script async src="..." />
</Head>

The warning message explains that this pattern will not
work well with Suspense/streaming and recommends using the
next/script component instead.

TODO in follow-up PR: add same warning for stylesheets, etc

Feature

Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
Integration tests added
Documentation added
Errors have helpful link attached, see contributing.md

ijjk · 2022-02-04T02:35:12Z

Failing test suites

Commit: ef9f1ca

test/integration/amphtml-fragment-style/test/index.test.js

AMP Fragment Styles > adds styles from fragment in AMP mode correctly

Expand output

● AMP Fragment Styles › adds styles from fragment in AMP mode correctly

expect(received).toBe(expected) // Object.is equality

Expected: "PASS"
Received: {"i": "FAIL"}

  16 |     }
  17 |   }
> 18 |   expect(result.status).toBe('PASS')
     |                         ^
  19 | }
  20 |

  at Object.validateAMP (lib/amp-test-utils.js:18:25)
  at Object.<anonymous> (integration/amphtml-fragment-style/test/index.test.js:35:5)

test/integration/amp-export-validation/test/index.test.js

AMP Validation on Export > should have shown errors during build
AMP Validation on Export > should export AMP pages

Expand output

● AMP Validation on Export › should have shown errors during build

expect(received).toMatch(expected)

Expected pattern: /error.*The mandatory attribute 'height' is missing in tag 'amp-video'\./
Received string:  "info  - Checking validity of types...
info  - Creating an optimized production build...
info  - Compiled successfully
info  - Collecting page data...
info  - Generating static pages (0/8)
info  - Generating static pages (2/8)
info  - Generating static pages (4/8)
info  - Generating static pages (6/8)
info  - Generating static pages (8/8)
Amp Validation·
/cat          warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
/dog-cat      warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
/dog          warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
/first        warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
/second       warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
/third?amp=1  warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.·
info  - Finalizing page optimization...·
Page                                       Size     First Load JS
┌ ○ /404                                   195 B          71.2 kB
├ ○ /cat (670 ms)                          AMP                AMP
├ ○ /dog                                   AMP                AMP
├ ○ /dog-cat                               AMP                AMP
├ ○ /first                                 AMP                AMP
├ ○ /second                                AMP                AMP
└ ○ /third                                 280 B          71.3 kB
+ First Load JS shared by all              71.1 kB
  ├ chunks/framework-158f450427c55907.js   41.9 kB
  ├ chunks/main-d137f23c48360464.js        27 kB
  ├ chunks/pages/_app-26477814f4b13881.js  1.37 kB
  └ chunks/webpack-fd82975a6094609f.js     727 B·
○  (Static)  automatically rendered as static HTML (uses no initial props)·
warn  - Detected next.config.js, no exported configuration found. https://nextjs.org/docs/messages/empty-configuration
warn  - The Next.js plugin was not detected in your ESLint configuration. See https://nextjs.org/docs/basic-features/eslint#migrating-existing-config
"

  24 |
  25 |   it('should have shown errors during build', async () => {
> 26 |     expect(buildOutput).toMatch(
     |                         ^
  27 |       /error.*The mandatory attribute 'height' is missing in tag 'amp-video'\./
  28 |     )
  29 |   })

  at Object.<anonymous> (integration/amp-export-validation/test/index.test.js:26:25)

● AMP Validation on Export › should export AMP pages

expect(received).toBe(expected) // Object.is equality

Expected: "PASS"
Received: {"i": "FAIL"}

  16 |     }
  17 |   }
> 18 |   expect(result.status).toBe('PASS')
     |                         ^
  19 | }
  20 |

  at Object.validateAMP (lib/amp-test-utils.js:18:25)
  at integration/amp-export-validation/test/index.test.js:36:9
      at async Promise.all (index 2)
  at Object.<anonymous> (integration/amp-export-validation/test/index.test.js:33:5)

test/integration/amphtml-custom-validator/test/index.test.js

AMP Custom Validator > should run in dev mode successfully

Expand output

● AMP Custom Validator › should run in dev mode successfully

expect(received).not.toContain(expected) // indexOf

Expected substring: not "error"
Received string:        "warn  - You have enabled experimental feature(s).
warn  - Experimental features are not covered by semver, and may cause unexpected or broken application behavior. Use them at your own risk.

warn  - Amp Validation

/  warn  The native JavaScript AMPHTML Validator (validator.js) has been turned down. If you are seeing this error, update your tooling to instead load the API compatible WebAssembly AMPHTML Validator (validator_wasm.js) instead.

"

  42 |     await killApp(app)
  43 |
> 44 |     expect(stderr).not.toContain('error')
     |                        ^
  45 |     expect(html).toContain('Hello from AMP')
  46 |   })
  47 | })

  at Object.<anonymous> (integration/amphtml-custom-validator/test/index.test.js:44:24)

This commit adds a development mode warning in the console if you try to include <script> tags in next/head, e.g. ``` <Head> <script async src="..." /> </Head> ``` The warning message explains that this pattern will not work well with Suspense/streaming and recommends using the next/script component instead.

ijjk · 2022-02-04T12:59:07Z

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	kara/next.js warning	Change
buildDuration	20.1s	20.2s	⚠️ +65ms
buildDurationCached	7.6s	7.7s	⚠️ +111ms
nodeModulesSize	359 MB	359 MB	⚠️ +511 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	kara/next.js warning	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.732	3.772	⚠️ +0.04
/ avg req/sec	669.93	662.84	⚠️ -7.09
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.817	1.803	-0.01
/error-in-render avg req/sec	1375.53	1386.94	+11.41

Client Bundles (main, webpack, commons)

	vercel/next.js canary	kara/next.js warning	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	27.3 kB	27.3 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.2 kB	71.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kara/next.js warning	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kara/next.js warning	Change
_app-HASH.js gzip	1.37 kB	1.37 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	326 B	326 B	✓
dynamic-HASH.js gzip	2.37 kB	2.37 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	919 B	919 B	✓
image-HASH.js gzip	4.94 kB	4.94 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.19 kB	2.19 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	kara/next.js warning	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	kara/next.js warning	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Diffs

Diff for main-HASH.js

@@ -3826,6 +3826,9 @@
                 return /*#__PURE__*/ _react.default.cloneElement(c, newProps);
               }
             }
+            // TODO(kara): warn for stylesheets as well as scripts
+            if (false) {
+            }
             return /*#__PURE__*/ _react.default.cloneElement(c, {
               key: key
             });

Diff for index.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Diff for link.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Diff for withRouter.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	kara/next.js warning	Change
buildDuration	24.4s	24.1s	-305ms
buildDurationCached	7.7s	7.7s	⚠️ +33ms
nodeModulesSize	359 MB	359 MB	⚠️ +511 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	kara/next.js warning	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.751	3.709	-0.04
/ avg req/sec	666.51	674.03	+7.52
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.799	1.846	⚠️ +0.05
/error-in-render avg req/sec	1389.32	1354.57	⚠️ -34.75

Client Bundles (main, webpack, commons)

	vercel/next.js canary	kara/next.js warning	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	27.4 kB	27.4 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.3 kB	71.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kara/next.js warning	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kara/next.js warning	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.36 kB	2.36 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	911 B	911 B	✓
image-HASH.js gzip	4.97 kB	4.97 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.21 kB	2.21 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	kara/next.js warning	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	kara/next.js warning	Change
index.html gzip	533 B	533 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.61 kB	1.61 kB	✓

Diffs

Diff for main-HASH.js

@@ -3826,6 +3826,9 @@
                 return /*#__PURE__*/ _react.default.cloneElement(c, newProps);
               }
             }
+            // TODO(kara): warn for stylesheets as well as scripts
+            if (false) {
+            }
             return /*#__PURE__*/ _react.default.cloneElement(c, {
               key: key
             });

Diff for index.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Diff for link.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Diff for withRouter.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-3bcc9011ce5cf468.js"
+      src="/_next/static/chunks/main-04b00b1eea9d690e.js"
       defer=""
     ></script>
     <script

Commit: 62d3aff

jakejarvis · 2022-02-05T19:10:48Z

Hey @kara and everyone, not a huge deal but it looks like I'm getting a ton of these warnings in canary 6 — not because I'm adding any script tags myself, but because I'm using next-seo's JSON-LD components (which I suppose technically does indirectly add script tags, but with type="application/ld+json" set... what a mess!)

Are these structured data "scripts" intended to be caught by this check? Happy to whip up a quick repo to reproduce this if it would be helpful. 😊

In vercel#33968, a warning was added for script tags inserted through the next/head component. This change unintentionally included application/ld+json scripts, which shouldn't be triggering the warnings (as they were originally intended to catch scripts where loading order or timing could be important). This change adds an exception for application/ld+json scripts, so they do not log the warning if they are included through next/head.

kara · 2022-02-05T19:55:37Z

Hmm, no, those types of script tags shouldn't be caught by the warning -- thanks for pointing this out! Just created a PR here to fix the issue.

jakejarvis · 2022-02-05T19:59:11Z

You are quick! Thanks so much!! 🚀

…34021) In #33968, a warning was added for script tags inserted through the next/head component. This change unintentionally included application/ld+json scripts, which shouldn't be triggering the warnings (as they were originally intended to catch scripts where loading order or timing could be important). This change adds an exception for application/ld+json scripts, so they do not log the warning if they are included through next/head.

) This commit adds a development mode warning in the console if you try to include <script> tags in next/head, e.g. ``` <Head> <script async src="..." /> </Head> ``` The warning message explains that this pattern will not work well with Suspense/streaming and recommends using the next/script component instead. TODO in follow-up PR: add same warning for stylesheets, etc ## Feature - [x] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [x] Integration tests added - [x] Documentation added - [x] Errors have helpful link attached, see `contributing.md`

…ercel#34021) In vercel#33968, a warning was added for script tags inserted through the next/head component. This change unintentionally included application/ld+json scripts, which shouldn't be triggering the warnings (as they were originally intended to catch scripts where loading order or timing could be important). This change adds an exception for application/ld+json scripts, so they do not log the warning if they are included through next/head.

ijjk added area: documentation created-by: Chrome Aurora PRs by the Google Chrome team: https://web.dev/aurora type: next labels Feb 4, 2022

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kara force-pushed the warning branch 2 times, most recently from 95bdcb9 to c22c78b Compare February 4, 2022 04:18

kara force-pushed the warning branch from c22c78b to 1538585 Compare February 4, 2022 04:36

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kara marked this pull request as ready for review February 4, 2022 06:07

kara requested review from huozhi, ijjk, shuding and timneutkens as code owners February 4, 2022 06:07

shuding approved these changes Feb 4, 2022

View reviewed changes

Merge branch 'canary' into warning

62d3aff

kodiakhq bot merged commit 61ea8ef into vercel:canary Feb 4, 2022

kara mentioned this pull request Feb 5, 2022

Do not warn when application/ld+json scripts are used with next/head #34021

Merged

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manovotny mentioned this pull request Feb 14, 2022

Adds consistency to ESLint rules. #34335

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Warn in dev mode when script tags are added with next/head #33968

Warn in dev mode when script tags are added with next/head #33968

kara commented Feb 4, 2022

ijjk commented Feb 4, 2022 •

edited

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ijjk commented Feb 4, 2022

Diffs

Diffs

jakejarvis commented Feb 5, 2022

kara commented Feb 5, 2022

jakejarvis commented Feb 5, 2022

Warn in dev mode when script tags are added with next/head #33968

Warn in dev mode when script tags are added with next/head #33968

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kara commented Feb 4, 2022

Feature

ijjk commented Feb 4, 2022 • edited Loading

Failing test suites

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ijjk commented Feb 4, 2022

Stats from current PR

Diffs

Diffs

jakejarvis commented Feb 5, 2022

kara commented Feb 5, 2022

jakejarvis commented Feb 5, 2022

ijjk commented Feb 4, 2022 •

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