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Add support for passing ref to next/link with new behavior enabled #36537

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merged 1 commit into from Apr 28, 2022

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timneutkens
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Found this case on the vercel.com app after running the codemod. A TypeScript error surfaced for ref on next/link as unsupported.

Current code:

const ref = useRef()

<Link href="/">
  <a ref={ref}>
    Home
  </a>
</Link>

Code after codemod:

const ref = useRef()

<Link href="/" ref={ref}> // Results in a TS error, also does not work as expected.
  Home
</Link>

This PR makes the code after running the codemod work.

Bug

  • Related issues linked using fixes #number
  • Integration tests added
  • Errors have helpful link attached, see contributing.md

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.
  • Errors have helpful link attached, see contributing.md

Documentation / Examples

  • Make sure the linting passes by running yarn lint

@ijjk
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ijjk commented Apr 28, 2022

Stats from current PR

Default Build (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
buildDuration 15.8s 14.8s -1s
buildDurationCached 5.9s 6.1s ⚠️ +149ms
nodeModulesSize 463 MB 463 MB ⚠️ +177 B
Page Load Tests Overall increase ✓
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
/ failed reqs 0 0
/ total time (seconds) 3.24 3.145 -0.1
/ avg req/sec 771.58 794.84 +23.26
/error-in-render failed reqs 0 0
/error-in-render total time (seconds) 1.327 1.33 0
/error-in-render avg req/sec 1883.57 1880.15 ⚠️ -3.42
Client Bundles (main, webpack)
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
925.HASH.js gzip 179 B 179 B
framework-HASH.js gzip 42 kB 42 kB
main-HASH.js gzip 28.6 kB 28.6 kB
webpack-HASH.js gzip 1.44 kB 1.44 kB
Overall change 72.3 kB 72.3 kB
Legacy Client Bundles (polyfills)
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
polyfills-HASH.js gzip 31 kB 31 kB
Overall change 31 kB 31 kB
Client Pages Overall increase ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
_app-HASH.js gzip 1.36 kB 1.36 kB
_error-HASH.js gzip 193 B 193 B
amp-HASH.js gzip 308 B 308 B
css-HASH.js gzip 327 B 327 B
dynamic-HASH.js gzip 3.08 kB 3.08 kB
head-HASH.js gzip 359 B 359 B
hooks-HASH.js gzip 920 B 920 B
image-HASH.js gzip 5.71 kB 5.71 kB
index-HASH.js gzip 263 B 263 B
link-HASH.js gzip 2.63 kB 2.64 kB ⚠️ +15 B
routerDirect..HASH.js gzip 320 B 320 B
script-HASH.js gzip 391 B 391 B
withRouter-HASH.js gzip 318 B 318 B
85e02e95b279..7e3.css gzip 107 B 107 B
Overall change 16.3 kB 16.3 kB ⚠️ +15 B
Client Build Manifests
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
_buildManifest.js gzip 459 B 459 B
Overall change 459 B 459 B
Rendered Page Sizes Overall decrease ✓
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
index.html gzip 531 B 531 B
link.html gzip 545 B 544 B -1 B
withRouter.html gzip 526 B 526 B
Overall change 1.6 kB 1.6 kB -1 B

Diffs

Diff for _buildManifest.js
@@ -13,7 +13,7 @@ self.__BUILD_MANIFEST = {
   "/head": ["static\u002Fchunks\u002Fpages\u002Fhead-544bb68363445a0e.js"],
   "/hooks": ["static\u002Fchunks\u002Fpages\u002Fhooks-c1372eeb4916d32c.js"],
   "/image": ["static\u002Fchunks\u002Fpages\u002Fimage-75136b1767faacf3.js"],
-  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-b2c86b9b6041c9a3.js"],
+  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-ca5e63d57db66cd2.js"],
   "/routerDirect": [
     "static\u002Fchunks\u002Fpages\u002FrouterDirect-113a7082ae16fbcb.js"
   ],
Diff for link-HASH.js
@@ -191,7 +191,10 @@
           scroll: scroll
         });
       }
-      function Link(props) {
+      var Link = /*#__PURE__*/ _react.default.forwardRef(function(
+        props,
+        forwardedRef
+      ) {
         var _legacyBehavior = props.legacyBehavior,
           legacyBehavior =
             _legacyBehavior === void 0
@@ -269,8 +272,9 @@
             child = _react.default.Children.only(children);
           }
         }
-        var childRef =
-          legacyBehavior && child && typeof child === "object" && child.ref;
+        var childRef = legacyBehavior
+          ? child && typeof child === "object" && child.ref
+          : forwardedRef;
         var ref1 = _slicedToArray(
             (0, _useIntersection).useIntersection({
               rootMargin: "200px"
@@ -289,14 +293,14 @@
               previousHref.current = href;
             }
             setIntersectionRef(el);
-            if (legacyBehavior && childRef) {
+            if (childRef) {
               if (typeof childRef === "function") childRef(el);
               else if (typeof childRef === "object") {
                 childRef.current = el;
               }
             }
           },
-          [as, childRef, href, resetVisible, setIntersectionRef, legacyBehavior]
+          [as, childRef, href, resetVisible, setIntersectionRef]
         );
         _react.default.useEffect(
           function() {
@@ -397,7 +401,7 @@
               Object.assign({}, restProps, childProps),
               children
             );
-      }
+      });
       var _default = Link;
       exports["default"] = _default;
       if (
Diff for link.html
@@ -27,7 +27,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/pages/link-b2c86b9b6041c9a3.js"
+      src="/_next/static/chunks/pages/link-ca5e63d57db66cd2.js"
       defer=""
     ></script>
     <script src="/_next/static/BUILD_ID/_buildManifest.js" defer=""></script>

Default Build with SWC (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
buildDuration 17.2s 16.8s -397ms
buildDurationCached 6.2s 6s -199ms
nodeModulesSize 463 MB 463 MB ⚠️ +177 B
Page Load Tests Overall decrease ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
/ failed reqs 0 0
/ total time (seconds) 3.236 3.302 ⚠️ +0.07
/ avg req/sec 772.44 757.12 ⚠️ -15.32
/error-in-render failed reqs 0 0
/error-in-render total time (seconds) 1.374 1.373 0
/error-in-render avg req/sec 1819.87 1820.42 +0.55
Client Bundles (main, webpack)
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
925.HASH.js gzip 178 B 178 B
framework-HASH.js gzip 42.2 kB 42.2 kB
main-HASH.js gzip 29.1 kB 29.1 kB
webpack-HASH.js gzip 1.45 kB 1.45 kB
Overall change 72.9 kB 72.9 kB
Legacy Client Bundles (polyfills)
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
polyfills-HASH.js gzip 31 kB 31 kB
Overall change 31 kB 31 kB
Client Pages Overall increase ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
_app-HASH.js gzip 1.35 kB 1.35 kB
_error-HASH.js gzip 179 B 179 B
amp-HASH.js gzip 312 B 312 B
css-HASH.js gzip 324 B 324 B
dynamic-HASH.js gzip 3.08 kB 3.08 kB
head-HASH.js gzip 357 B 357 B
hooks-HASH.js gzip 921 B 921 B
image-HASH.js gzip 5.76 kB 5.76 kB
index-HASH.js gzip 261 B 261 B
link-HASH.js gzip 2.74 kB 2.76 kB ⚠️ +23 B
routerDirect..HASH.js gzip 322 B 322 B
script-HASH.js gzip 392 B 392 B
withRouter-HASH.js gzip 317 B 317 B
85e02e95b279..7e3.css gzip 107 B 107 B
Overall change 16.4 kB 16.5 kB ⚠️ +23 B
Client Build Manifests Overall increase ⚠️
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
_buildManifest.js gzip 457 B 458 B ⚠️ +1 B
Overall change 457 B 458 B ⚠️ +1 B
Rendered Page Sizes
vercel/next.js canary timneutkens/next.js add/ref-passing-new-link Change
index.html gzip 527 B 527 B
link.html gzip 541 B 541 B
withRouter.html gzip 525 B 525 B
Overall change 1.59 kB 1.59 kB

Diffs

Diff for _buildManifest.js
@@ -13,7 +13,7 @@ self.__BUILD_MANIFEST = {
   "/head": ["static\u002Fchunks\u002Fpages\u002Fhead-544bb68363445a0e.js"],
   "/hooks": ["static\u002Fchunks\u002Fpages\u002Fhooks-c1372eeb4916d32c.js"],
   "/image": ["static\u002Fchunks\u002Fpages\u002Fimage-75136b1767faacf3.js"],
-  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-b2c86b9b6041c9a3.js"],
+  "/link": ["static\u002Fchunks\u002Fpages\u002Flink-ca5e63d57db66cd2.js"],
   "/routerDirect": [
     "static\u002Fchunks\u002Fpages\u002FrouterDirect-113a7082ae16fbcb.js"
   ],
Diff for link-HASH.js
@@ -191,7 +191,10 @@
           scroll: scroll
         });
       }
-      function Link(props) {
+      var Link = /*#__PURE__*/ _react.default.forwardRef(function(
+        props,
+        forwardedRef
+      ) {
         var _legacyBehavior = props.legacyBehavior,
           legacyBehavior =
             _legacyBehavior === void 0
@@ -269,8 +272,9 @@
             child = _react.default.Children.only(children);
           }
         }
-        var childRef =
-          legacyBehavior && child && typeof child === "object" && child.ref;
+        var childRef = legacyBehavior
+          ? child && typeof child === "object" && child.ref
+          : forwardedRef;
         var ref1 = _slicedToArray(
             (0, _useIntersection).useIntersection({
               rootMargin: "200px"
@@ -289,14 +293,14 @@
               previousHref.current = href;
             }
             setIntersectionRef(el);
-            if (legacyBehavior && childRef) {
+            if (childRef) {
               if (typeof childRef === "function") childRef(el);
               else if (typeof childRef === "object") {
                 childRef.current = el;
               }
             }
           },
-          [as, childRef, href, resetVisible, setIntersectionRef, legacyBehavior]
+          [as, childRef, href, resetVisible, setIntersectionRef]
         );
         _react.default.useEffect(
           function() {
@@ -397,7 +401,7 @@
               Object.assign({}, restProps, childProps),
               children
             );
-      }
+      });
       var _default = Link;
       exports["default"] = _default;
       if (
Diff for link.html
@@ -27,7 +27,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/pages/link-b2c86b9b6041c9a3.js"
+      src="/_next/static/chunks/pages/link-ca5e63d57db66cd2.js"
       defer=""
     ></script>
     <script src="/_next/static/BUILD_ID/_buildManifest.js" defer=""></script>
Commit: 867292b

@timneutkens timneutkens merged commit 2451f52 into vercel:canary Apr 28, 2022
@timneutkens timneutkens deleted the add/ref-passing-new-link branch April 28, 2022 09:32
@github-actions github-actions bot locked as resolved and limited conversation to collaborators May 28, 2022
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3 participants