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Add helpful error for link with multiple children #25657

Merged
merged 3 commits into from May 31, 2021
Merged

Add helpful error for link with multiple children #25657

merged 3 commits into from May 31, 2021

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timneutkens
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Makes sure a helpful error is shown for <Link> with multiple children

Bug

  • Related issues linked using fixes #number
  • Integration tests added

Feature

  • Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
  • Related issues linked using fixes #number
  • Integration tests added
  • Documentation added
  • Telemetry added. In case of a feature if it's used or not.

Documentation / Examples

  • Make sure the linting passes

@timneutkens timneutkens changed the title fix/add helpful error for link children Add helpful error for link with multiple children May 31, 2021
@ijjk
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ijjk commented May 31, 2021

Stats from current PR

Default Server Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
buildDuration 11.8s 11.7s -108ms
buildDurationCached 3.3s 3.4s ⚠️ +151ms
nodeModulesSize 46.7 MB 46.7 MB ⚠️ +1.21 kB
Page Load Tests Overall increase ✓
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
/ failed reqs 0 0 ✓
/ total time (seconds) 2.187 2.211 ⚠️ +0.02
/ avg req/sec 1143.08 1130.91 ⚠️ -12.17
/error-in-render failed reqs 0 0 ✓
/error-in-render total time (seconds) 1.162 1.14 -0.02
/error-in-render avg req/sec 2150.84 2193.26 +42.42
Client Bundles (main, webpack, commons)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
framework-HASH.js gzip 39.3 kB 39.3 kB ✓
main-HASH.js gzip 19.4 kB 19.4 kB ✓
webpack-HASH.js gzip 804 B 804 B ✓
Overall change 59.5 kB 59.5 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
polyfills-HASH.js gzip 31.1 kB 31.1 kB ✓
Overall change 31.1 kB 31.1 kB ✓
Client Pages Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_app-HASH.js gzip 1.02 kB 1.02 kB ✓
_error-HASH.js gzip 3.06 kB 3.06 kB ✓
amp-HASH.js gzip 526 B 526 B ✓
css-HASH.js gzip 334 B 334 B ✓
hooks-HASH.js gzip 890 B 890 B ✓
index-HASH.js gzip 262 B 262 B ✓
link-HASH.js gzip 1.64 kB 1.65 kB ⚠️ +4 B
routerDirect..HASH.js gzip 331 B 331 B ✓
withRouter-HASH.js gzip 329 B 329 B ✓
bb14e60e810b..30f.css gzip 125 B 125 B ✓
Overall change 8.52 kB 8.53 kB ⚠️ +4 B
Client Build Manifests
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_buildManifest.js gzip 392 B 392 B ✓
Overall change 392 B 392 B ✓
Rendered Page Sizes Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
index.html gzip 561 B 561 B ✓
link.html gzip 568 B 569 B ⚠️ +1 B
withRouter.html gzip 557 B 557 B ✓
Overall change 1.69 kB 1.69 kB ⚠️ +1 B

Diffs

Diff for _buildManifest.js 
@@ -12,7 +12,7 @@ self.__BUILD_MANIFEST = {
   "/hooks": [
     "static\u002Fchunks\u002Fpages\u002Fhooks-ac434c51eeb0f395a39d.js"
   ],
-  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-47f6aa1a34adbbacdbbf.js"],
+  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-4fe890c54542b20b55c4.js"],
   "/routerDirect": [
     "static\u002Fchunks\u002Fpages\u002FrouterDirect-2ffbe1bc5bc0c7d0c63f.js"
   ],
Diff for link-HASH.js 
@@ -136,7 +136,12 @@
           );
         } // This will return the first child, if multiple are provided it will throw an error
 
-        var child = _react.Children.only(children);
+        var child;
+
+        if (false) {
+        } else {
+          child = _react.Children.only(children);
+        }
 
         var childRef = child && typeof child === "object" && child.ref;
Diff for link.html 
@@ -27,7 +27,7 @@
     />
     <link
       rel="preload"
-      href="/_next/static/chunks/pages/link-47f6aa1a34adbbacdbbf.js"
+      href="/_next/static/chunks/pages/link-4fe890c54542b20b55c4.js"
       as="script"
     />
   </head>
@@ -69,7 +69,7 @@
       async=""
     ></script>
     <script
-      src="/_next/static/chunks/pages/link-47f6aa1a34adbbacdbbf.js"
+      src="/_next/static/chunks/pages/link-4fe890c54542b20b55c4.js"
       async=""
     ></script>
     <script src="/_next/static/BUILD_ID/_buildManifest.js" async=""></script>
Serverless Mode
General Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
buildDuration 13.8s 13.4s -427ms
buildDurationCached 4.2s 4.2s ⚠️ +1ms
nodeModulesSize 46.7 MB 46.7 MB ⚠️ +1.21 kB
Client Bundles (main, webpack, commons)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
framework-HASH.js gzip 39.3 kB 39.3 kB ✓
main-HASH.js gzip 19.4 kB 19.4 kB ✓
webpack-HASH.js gzip 804 B 804 B ✓
Overall change 59.5 kB 59.5 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
polyfills-HASH.js gzip 31.1 kB 31.1 kB ✓
Overall change 31.1 kB 31.1 kB ✓
Client Pages Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_app-HASH.js gzip 1.02 kB 1.02 kB ✓
_error-HASH.js gzip 3.06 kB 3.06 kB ✓
amp-HASH.js gzip 526 B 526 B ✓
css-HASH.js gzip 334 B 334 B ✓
hooks-HASH.js gzip 890 B 890 B ✓
index-HASH.js gzip 262 B 262 B ✓
link-HASH.js gzip 1.64 kB 1.65 kB ⚠️ +4 B
routerDirect..HASH.js gzip 331 B 331 B ✓
withRouter-HASH.js gzip 329 B 329 B ✓
bb14e60e810b..30f.css gzip 125 B 125 B ✓
Overall change 8.52 kB 8.53 kB ⚠️ +4 B
Client Build Manifests
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_buildManifest.js gzip 392 B 392 B ✓
Overall change 392 B 392 B ✓
Serverless bundles
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_error.js 16.9 kB 16.9 kB ✓
404.html 2.42 kB 2.42 kB ✓
500.html 2.41 kB 2.41 kB ✓
amp.amp.html 10.8 kB 10.8 kB ✓
amp.html 1.61 kB 1.61 kB ✓
css.html 1.79 kB 1.79 kB ✓
hooks.html 1.67 kB 1.67 kB ✓
index.js 17.2 kB 17.2 kB ✓
link.js 17.4 kB 17.4 kB ✓
routerDirect.js 17.4 kB 17.4 kB ✓
withRouter.js 17.4 kB 17.4 kB ✓
Overall change 107 kB 107 kB ✓
Webpack 4 Mode (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
buildDuration 10.7s 10.8s ⚠️ +105ms
buildDurationCached 4.6s 4.6s ⚠️ +26ms
nodeModulesSize 46.7 MB 46.7 MB ⚠️ +1.21 kB
Page Load Tests Overall increase ✓
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
/ failed reqs 0 0 ✓
/ total time (seconds) 2.317 2.22 -0.1
/ avg req/sec 1078.97 1126.17 +47.2
/error-in-render failed reqs 0 0 ✓
/error-in-render total time (seconds) 1.216 1.149 -0.07
/error-in-render avg req/sec 2055.29 2175.52 +120.23
Client Bundles (main, webpack, commons)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
677f882d2ed8..HASH.js gzip 13.3 kB 13.3 kB ✓
framework.HASH.js gzip 39 kB 39 kB ✓
main-HASH.js gzip 7.26 kB 7.26 kB ✓
webpack-HASH.js gzip 751 B 751 B ✓
Overall change 60.3 kB 60.3 kB ✓
Legacy Client Bundles (polyfills)
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
polyfills-HASH.js gzip 31.3 kB 31.3 kB ✓
Overall change 31.3 kB 31.3 kB ✓
Client Pages Overall increase ⚠️
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_app-HASH.js gzip 1.28 kB 1.28 kB ✓
_error-HASH.js gzip 3.74 kB 3.74 kB ✓
amp-HASH.js gzip 536 B 536 B ✓
css-HASH.js gzip 339 B 339 B ✓
hooks-HASH.js gzip 887 B 887 B ✓
index-HASH.js gzip 227 B 227 B ✓
link-HASH.js gzip 1.63 kB 1.63 kB ⚠️ +2 B
routerDirect..HASH.js gzip 303 B 303 B ✓
withRouter-HASH.js gzip 302 B 302 B ✓
e025d2764813..52f.css gzip 125 B 125 B ✓
Overall change 9.37 kB 9.37 kB ⚠️ +2 B
Client Build Manifests
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
_buildManifest.js gzip 420 B 420 B ✓
Overall change 420 B 420 B ✓
Rendered Page Sizes
vercel/next.js canary timneutkens/next.js fix/add-helpful-error-for-link-children Change
index.html gzip 612 B 612 B ✓
link.html gzip 619 B 619 B ✓
withRouter.html gzip 606 B 606 B ✓
Overall change 1.84 kB 1.84 kB ✓

Diffs

Diff for _buildManifest.js 
@@ -12,7 +12,7 @@ self.__BUILD_MANIFEST = {
   "/hooks": [
     "static\u002Fchunks\u002Fpages\u002Fhooks-f1cc32851f5e866a7e78.js"
   ],
-  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-4b26731d43b4caf43737.js"],
+  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-b1edcc58b3477620bce2.js"],
   "/routerDirect": [
     "static\u002Fchunks\u002Fpages\u002FrouterDirect-e9bdf4dc22ca5dd5d885.js"
   ],
Diff for link-HASH.js 
@@ -194,7 +194,12 @@ _N_E = (window["webpackJsonp_N_E"] = window["webpackJsonp_N_E"] || []).push([
           );
         } // This will return the first child, if multiple are provided it will throw an error
 
-        var child = _react.Children.only(children);
+        var child;
+
+        if (false) {
+        } else {
+          child = _react.Children.only(children);
+        }
 
         var childRef = child && typeof child === "object" && child.ref;
Diff for link.html 
@@ -32,7 +32,7 @@
     />
     <link
       rel="preload"
-      href="/_next/static/chunks/pages/link-4b26731d43b4caf43737.js"
+      href="/_next/static/chunks/pages/link-b1edcc58b3477620bce2.js"
       as="script"
     />
   </head>
@@ -78,7 +78,7 @@
       async=""
     ></script>
     <script
-      src="/_next/static/chunks/pages/link-4b26731d43b4caf43737.js"
+      src="/_next/static/chunks/pages/link-b1edcc58b3477620bce2.js"
       async=""
     ></script>
     <script src="/_next/static/BUILD_ID/_buildManifest.js" async=""></script>
Commit: f071327

@kodiakhq kodiakhq bot merged commit 9890565 into vercel:canary May 31, 2021
@mbifulco
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mbifulco commented Jun 2, 2021

I just wanted to give @timneutkens a shout-out for this PR... he did a great job of proactively finding me asking for help on twitter (without tagging him/next/vercel/etc), put together a simple and effective PR, and patiently responded to my follow-up questions.

This is a truly outstanding experience - thank you Tim! I'm looking forward to being able to contribute to the project myself... and I'm nearly done with my site conversion! 🙌

@sync-by-unito sync-by-unito bot mentioned this pull request Jun 16, 2021
Closed
flybayer pushed a commit to blitz-js/next.js that referenced this pull request Jun 16, 2021
@timneutkens
Add helpful error for link with multiple children (vercel#25657)
9f859bb 
Makes sure a helpful error is shown for `<Link>` with multiple children



## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes
@vercel vercel locked as resolved and limited conversation to collaborators Jan 28, 2022
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@ijjk ijjk ijjk approved these changes

@divmain divmain Awaiting requested review from divmain

@lfades lfades Awaiting requested review from lfades

@shuding shuding Awaiting requested review from shuding shuding is a code owner

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@timneutkens @ijjk @mbifulco