Turbopack: Add a custom serde_self_describing Serializer/Deserializer #86885

bgw · 2025-12-05T21:57:46Z

Implements a minimal custom serde Serializer and Deserializer on top of bincode with a custom self-describing format. The API is exposed as functions that can be used in #[bincode(with = "...")] attributes.

This doesn't encode as efficiently as pot, but it lets us get rid of that dependency entirely. It also gives us a more efficient option than serde_json for certain values.

bgw · 2025-12-05T21:58:02Z

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mischnic · 2025-12-05T22:10:09Z

crates/next-core/src/next_config.rs

    cache_handlers: Option<FxIndexMap<RcStr, RcStr>>,
-    #[bincode(with = "turbo_bincode::serde_json")]
+    #[bincode(with = "turbo_bincode::serde_self_describing")]
    env: FxIndexMap<String, JsonValue>,


We already declare FxIndexMap as an alias ourself.

Could we turn it into a proper newtype that derefs to FxIndexMap and automatically derives the right thing without needing bincode(with at every use site?

This specific one would still need the with because it uses JsonValue.

I'd much rather get rid of FxIndexMap in 99% of turbo_task::values and replace them with an immutable map implementation that stores it as a sorted Box<[K, V]>. Most of these cases don't care specifically about insertion order, just that there is some deterministic order.

nextjs-bot · 2025-12-05T22:13:58Z

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js bgw/bincode-self-describing	Change
buildDuration	17.6s	15.1s	N/A
buildDurationCached	14.1s	11.1s	N/A
nodeModulesSize	456 MB	456 MB	✓
nextStartRea..uration (ms)	695ms	692ms	N/A

Client Bundles (main, webpack) Overall increase ⚠️

	vercel/next.js canary	vercel/next.js bgw/bincode-self-describing	Change
4951-HASH.js gzip	5.37 kB	5.38 kB	N/A
68680909-HASH.js gzip	62.3 kB	62.3 kB	N/A
8034-HASH.js gzip	52.8 kB	53 kB	⚠️ +205 B
9564.HASH.js gzip	170 B	168 B	N/A
9565-HASH.js gzip	4.46 kB	4.48 kB	N/A
framework-HASH.js gzip	59.7 kB	59.7 kB	N/A
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main-HASH.js gzip	38.6 kB	38.5 kB	N/A
webpack-HASH.js gzip	1.69 kB	1.69 kB	N/A
Overall change	52.8 kB	53 kB	⚠️ +205 B

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js bgw/bincode-self-describing	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

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_error-HASH.js gzip	183 B	182 B	N/A
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Client Build Manifests

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Rendered Page Sizes

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index.html gzip	524 B	522 B	N/A
link.html gzip	540 B	538 B	N/A
withRouter.html gzip	521 B	518 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size Overall increase ⚠️

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edge-ssr.js gzip	124 kB	124 kB	⚠️ +128 B
page.js gzip	235 kB	235 kB	N/A
Overall change	124 kB	124 kB	⚠️ +128 B

Middleware size

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middleware-b..fest.js gzip	652 B	654 B	N/A
middleware-r..fest.js gzip	156 B	156 B	✓
middleware.js gzip	32.8 kB	32.9 kB	N/A
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Overall change	1 kB	1 kB	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js bgw/bincode-self-describing	Change
app-page-exp...dev.js gzip	301 kB	301 kB	N/A
app-page-exp..prod.js gzip	155 kB	155 kB	✓
app-page-tur...dev.js gzip	300 kB	300 kB	✓
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app-page-tur..prod.js gzip	153 kB	153 kB	✓
app-page.run...dev.js gzip	297 kB	297 kB	N/A
app-page.run..prod.js gzip	153 kB	153 kB	✓
app-route-ex...dev.js gzip	68.5 kB	68.5 kB	✓
app-route-ex..prod.js gzip	47.4 kB	47.4 kB	✓
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dist_client_...dev.js gzip	328 B	328 B	✓
dist_client_...dev.js gzip	320 B	320 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
pages-api-tu...dev.js gzip	40.9 kB	40.9 kB	✓
pages-api-tu..prod.js gzip	31 kB	31 kB	✓
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pages-api.ru..prod.js gzip	31 kB	31 kB	✓
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pages.runtim..prod.js gzip	37.9 kB	37.9 kB	✓
server.runti..prod.js gzip	59.8 kB	59.8 kB	✓
Overall change	2.06 MB	2.06 MB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js bgw/bincode-self-describing	Change
0.pack gzip	3.1 MB	3.1 MB	N/A
index.pack gzip	93 kB	93.8 kB	⚠️ +762 B
Overall change	93 kB	93.8 kB	⚠️ +762 B

Diff details

Diff for page.js

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Diff for middleware.js

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Diff for edge-ssr.js

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Diff for _buildManifest.js

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@@ -502,7 +342,167 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
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+      const _react = /*#__PURE__*/ _interop_require_default._(
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+
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+      _export(exports, {
+        /**
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+         * It uses [React.lazy()](https://react.dev/reference/react/lazy) with [Suspense](https://react.dev/reference/react/Suspense) under the hood.
+         *
+         * Read more: [Next.js Docs: `next/dynamic`](https://nextjs.org/docs/app/building-your-application/optimizing/lazy-loading#nextdynamic)
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+      const isServerSide = "object" === "undefined";
+      // Normalize loader to return the module as form { default: Component } for `React.lazy`.
+      // Also for backward compatible since next/dynamic allows to resolve a component directly with loader
+      // Client component reference proxy need to be converted to a module.
+      function convertModule(mod) {
+        return {
+          default: mod?.default || mod,
+        };
+      }
+      function noSSR(LoadableInitializer, loadableOptions) {
+        // Removing webpack and modules means react-loadable won't try preloading
+        delete loadableOptions.webpack;
+        delete loadableOptions.modules;
+        // This check is necessary to prevent react-loadable from initializing on the server
+        if (!isServerSide) {
+          return LoadableInitializer(loadableOptions);
+        }
+        const Loading = loadableOptions.loading;
+        // This will only be rendered on the server side
+        return () =>
+          /*#__PURE__*/ (0, _jsxruntime.jsx)(Loading, {
+            error: null,
+            isLoading: true,
+            pastDelay: false,
+            timedOut: false,
+          });
+      }
+      function dynamic(dynamicOptions, options) {
+        let loadableFn = _loadablesharedruntime.default;
+        let loadableOptions = {
+          // A loading component is not required, so we default it
+          loading: ({ error, isLoading, pastDelay }) => {
+            if (!pastDelay) return null;
+            if (false) {
+            }
+            return null;
+          },
+        };
+        // Support for direct import(), eg: dynamic(import('../hello-world'))
+        // Note that this is only kept for the edge case where someone is passing in a promise as first argument
+        // The react-loadable babel plugin will turn dynamic(import('../hello-world')) into dynamic(() => import('../hello-world'))
+        // To make sure we don't execute the import without rendering first
+        if (dynamicOptions instanceof Promise) {
+          loadableOptions.loader = () => dynamicOptions;
+          // Support for having import as a function, eg: dynamic(() => import('../hello-world'))
+        } else if (typeof dynamicOptions === "function") {
+          loadableOptions.loader = dynamicOptions;
+          // Support for having first argument being options, eg: dynamic({loader: import('../hello-world')})
+        } else if (typeof dynamicOptions === "object") {
+          loadableOptions = {
+            ...loadableOptions,
+            ...dynamicOptions,
+          };
+        }
+        // Support for passing options, eg: dynamic(import('../hello-world'), {loading: () => <p>Loading something</p>})
+        loadableOptions = {
+          ...loadableOptions,
+          ...options,
+        };
+        const loaderFn = loadableOptions.loader;
+        const loader = () =>
+          loaderFn != null
+            ? loaderFn().then(convertModule)
+            : Promise.resolve(convertModule(() => null));
+        // coming from build/babel/plugins/react-loadable-plugin.js
+        if (loadableOptions.loadableGenerated) {
+          loadableOptions = {
+            ...loadableOptions,
+            ...loadableOptions.loadableGenerated,
+          };
+          delete loadableOptions.loadableGenerated;
+        }
+        // support for disabling server side rendering, eg: dynamic(() => import('../hello-world'), {ssr: false}).
+        if (typeof loadableOptions.ssr === "boolean" && !loadableOptions.ssr) {
+          delete loadableOptions.webpack;
+          delete loadableOptions.modules;
+          return noSSR(loadableFn, loadableOptions);
+        }
+        return loadableFn({
+          ...loadableOptions,
+          loader: loader,
+        });
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=dynamic.js.map
+
+      /***/
+    },
+
+    /***/ 8258: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -510,7 +510,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/dynamic",
         function () {
-          return __webpack_require__(2907);
+          return __webpack_require__(4773);
         },
       ]);
       if (false) {
@@ -524,7 +524,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(4236)
+      __webpack_exec__(8258)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for head-HASH.js

@@ -1,24 +1,13 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [5350],
   {
-    /***/ 2366: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/head",
-        function () {
-          return __webpack_require__(8140);
-        },
-      ]);
-      if (false) {
-      }
+    /***/ 48: /***/ (module, __unused_webpack_exports, __webpack_require__) => {
+      module.exports = __webpack_require__(8141);
 
       /***/
     },
 
-    /***/ 8140: /***/ (
+    /***/ 2682: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -33,7 +22,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(7002);
       /* harmony import */ var next_head__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(9386);
+        __webpack_require__(48);
       /* harmony import */ var next_head__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_head__WEBPACK_IMPORTED_MODULE_1__
@@ -67,12 +56,19 @@
       /***/
     },
 
-    /***/ 9386: /***/ (
-      module,
+    /***/ 2956: /***/ (
+      __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(1649);
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/head",
+        function () {
+          return __webpack_require__(2682);
+        },
+      ]);
+      if (false) {
+      }
 
       /***/
     },
@@ -82,7 +78,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(2366)
+      __webpack_exec__(2956)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for image-HASH.js

@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [2983],
   {
-    /***/ 497: /***/ (
+    /***/ 8114: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/image",
+        function () {
+          return __webpack_require__(9180);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9180: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -18,8 +35,8 @@
 
       // EXTERNAL MODULE: ./node_modules/.pnpm/react@19.2.1/node_modules/react/jsx-runtime.js
       var jsx_runtime = __webpack_require__(7002);
-      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+main-repo+packages+next+next-packed.tgz_react-dom@19.2.1_react@19.2.1__react@19.2.1/node_modules/next/image.js
-      var next_image = __webpack_require__(9565);
+      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+diff-repo+packages+next+next-packed.tgz_react-dom@19.2.1_react@19.2.1__react@19.2.1/node_modules/next/image.js
+      var next_image = __webpack_require__(5467);
       var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
       /* harmony default export */ const nextjs = {
         src: "/_next/static/media/nextjs.cae0b805.png",
@@ -48,30 +65,13 @@
 
       /***/
     },
-
-    /***/ 5748: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/image",
-        function () {
-          return __webpack_require__(497);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
-    /******/ __webpack_require__.O(0, [9565, 636, 6593, 8792], () =>
-      __webpack_exec__(5748)
+    /******/ __webpack_require__.O(0, [5467, 636, 6593, 8792], () =>
+      __webpack_exec__(8114)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for link-HASH.js

@@ -1,7 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 1182: /***/ (
+    /***/ 2156: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -9,7 +9,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/link",
         function () {
-          return __webpack_require__(4610);
+          return __webpack_require__(8272);
         },
       ]);
       if (false) {
@@ -18,7 +18,220 @@
       /***/
     },
 
-    /***/ 1557: /***/ (module, exports, __webpack_require__) => {
+    /***/ 4581: /***/ (module, exports, __webpack_require__) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "useIntersection", {
+        enumerable: true,
+        get: function () {
+          return useIntersection;
+        },
+      });
+      const _react = __webpack_require__(6466);
+      const _requestidlecallback = __webpack_require__(7441);
+      const hasIntersectionObserver =
+        typeof IntersectionObserver === "function";
+      const observers = new Map();
+      const idList = [];
+      function createObserver(options) {
+        const id = {
+          root: options.root || null,
+          margin: options.rootMargin || "",
+        };
+        const existing = idList.find(
+          (obj) => obj.root === id.root && obj.margin === id.margin
+        );
+        let instance;
+        if (existing) {
+          instance = observers.get(existing);
+          if (instance) {
+            return instance;
+          }
+        }
+        const elements = new Map();
+        const observer = new IntersectionObserver((entries) => {
+          entries.forEach((entry) => {
+            const callback = elements.get(entry.target);
+            const isVisible =
+              entry.isIntersecting || entry.intersectionRatio > 0;
+            if (callback && isVisible) {
+              callback(isVisible);
+            }
+          });
+        }, options);
+        instance = {
+          id,
+          observer,
+          elements,
+        };
+        idList.push(id);
+        observers.set(id, instance);
+        return instance;
+      }
+      function observe(element, callback, options) {
+        const { id, observer, elements } = createObserver(options);
+        elements.set(element, callback);
+        observer.observe(element);
+        return function unobserve() {
+          elements.delete(element);
+          observer.unobserve(element);
+          // Destroy observer when there's nothing left to watch:
+          if (elements.size === 0) {
+            observer.disconnect();
+            observers.delete(id);
+            const index = idList.findIndex(
+              (obj) => obj.root === id.root && obj.margin === id.margin
+            );
+            if (index > -1) {
+              idList.splice(index, 1);
+            }
+          }
+        };
+      }
+      function useIntersection({ rootRef, rootMargin, disabled }) {
+        const isDisabled = disabled || !hasIntersectionObserver;
+        const [visible, setVisible] = (0, _react.useState)(false);
+        const elementRef = (0, _react.useRef)(null);
+        const setElement = (0, _react.useCallback)((element) => {
+          elementRef.current = element;
+        }, []);
+        (0, _react.useEffect)(() => {
+          if (hasIntersectionObserver) {
+            if (isDisabled || visible) return;
+            const element = elementRef.current;
+            if (element && element.tagName) {
+              const unobserve = observe(
+                element,
+                (isVisible) => isVisible && setVisible(isVisible),
+                {
+                  root: rootRef?.current,
+                  rootMargin,
+                }
+              );
+              return unobserve;
+            }
+          } else {
+            if (!visible) {
+              const idleCallback = (0,
+              _requestidlecallback.requestIdleCallback)(() => setVisible(true));
+              return () =>
+                (0, _requestidlecallback.cancelIdleCallback)(idleCallback);
+            }
+          }
+          // eslint-disable-next-line react-hooks/exhaustive-deps
+        }, [isDisabled, rootMargin, rootRef, visible, elementRef.current]);
+        const resetVisible = (0, _react.useCallback)(() => {
+          setVisible(false);
+        }, []);
+        return [setElement, visible, resetVisible];
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=use-intersection.js.map
+
+      /***/
+    },
+
+    /***/ 6155: /***/ (module, exports, __webpack_require__) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "useMergedRef", {
+        enumerable: true,
+        get: function () {
+          return useMergedRef;
+        },
+      });
+      const _react = __webpack_require__(6466);
+      function useMergedRef(refA, refB) {
+        const cleanupA = (0, _react.useRef)(null);
+        const cleanupB = (0, _react.useRef)(null);
+        // NOTE: In theory, we could skip the wrapping if only one of the refs is non-null.
+        // (this happens often if the user doesn't pass a ref to Link/Form/Image)
+        // But this can cause us to leak a cleanup-ref into user code (previously via `<Link legacyBehavior>`),
+        // and the user might pass that ref into ref-merging library that doesn't support cleanup refs
+        // (because it hasn't been updated for React 19)
+        // which can then cause things to blow up, because a cleanup-returning ref gets called with `null`.
+        // So in practice, it's safer to be defensive and always wrap the ref, even on React 19.
+        return (0, _react.useCallback)(
+          (current) => {
+            if (current === null) {
+              const cleanupFnA = cleanupA.current;
+              if (cleanupFnA) {
+                cleanupA.current = null;
+                cleanupFnA();
+              }
+              const cleanupFnB = cleanupB.current;
+              if (cleanupFnB) {
+                cleanupB.current = null;
+                cleanupFnB();
+              }
+            } else {
+              if (refA) {
+                cleanupA.current = applyRef(refA, current);
+              }
+              if (refB) {
+                cleanupB.current = applyRef(refB, current);
+              }
+            }
+          },
+          [refA, refB]
+        );
+      }
+      function applyRef(refA, current) {
+        if (typeof refA === "function") {
+          const cleanup = refA(current);
+          if (typeof cleanup === "function") {
+            return cleanup;
+          } else {
+            return () => refA(null);
+          }
+        } else {
+          refA.current = current;
+          return () => {
+            refA.current = null;
+          };
+        }
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=use-merged-ref.js.map
+
+      /***/
+    },
+
+    /***/ 7046: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(8113);
+
+      /***/
+    },
+
+    /***/ 8113: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -45,17 +258,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(6466)
       );
-      const _resolvehref = __webpack_require__(5475);
-      const _islocalurl = __webpack_require__(6475);
-      const _formaturl = __webpack_require__(9998);
-      const _utils = __webpack_require__(3084);
-      const _addlocale = __webpack_require__(3921);
-      const _routercontextsharedruntime = __webpack_require__(7726);
-      const _useintersection = __webpack_require__(4806);
-      const _getdomainlocale = __webpack_require__(3219);
-      const _addbasepath = __webpack_require__(5498);
-      const _usemergedref = __webpack_require__(3255);
-      const _erroronce = __webpack_require__(1685);
+      const _resolvehref = __webpack_require__(2399);
+      const _islocalurl = __webpack_require__(6687);
+      const _formaturl = __webpack_require__(4802);
+      const _utils = __webpack_require__(9208);
+      const _addlocale = __webpack_require__(9845);
+      const _routercontextsharedruntime = __webpack_require__(3466);
+      const _useintersection = __webpack_require__(4581);
+      const _getdomainlocale = __webpack_require__(8319);
+      const _addbasepath = __webpack_require__(4126);
+      const _usemergedref = __webpack_require__(6155);
+      const _erroronce = __webpack_require__(8305);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -434,140 +647,7 @@
       /***/
     },
 
-    /***/ 1685: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "errorOnce", {
-        enumerable: true,
-        get: function () {
-          return errorOnce;
-        },
-      });
-      let errorOnce = (_) => {};
-      if (false) {
-      } //# sourceMappingURL=error-once.js.map
-
-      /***/
-    },
-
-    /***/ 3219: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "getDomainLocale", {
-        enumerable: true,
-        get: function () {
-          return getDomainLocale;
-        },
-      });
-      const _normalizetrailingslash = __webpack_require__(1059);
-      const basePath =
-        /* unused pure expression or super */ null && (false || "");
-      function getDomainLocale(path, locale, locales, domainLocales) {
-        if (false) {
-        } else {
-          return false;
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=get-domain-locale.js.map
-
-      /***/
-    },
-
-    /***/ 3255: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "useMergedRef", {
-        enumerable: true,
-        get: function () {
-          return useMergedRef;
-        },
-      });
-      const _react = __webpack_require__(6466);
-      function useMergedRef(refA, refB) {
-        const cleanupA = (0, _react.useRef)(null);
-        const cleanupB = (0, _react.useRef)(null);
-        // NOTE: In theory, we could skip the wrapping if only one of the refs is non-null.
-        // (this happens often if the user doesn't pass a ref to Link/Form/Image)
-        // But this can cause us to leak a cleanup-ref into user code (previously via `<Link legacyBehavior>`),
-        // and the user might pass that ref into ref-merging library that doesn't support cleanup refs
-        // (because it hasn't been updated for React 19)
-        // which can then cause things to blow up, because a cleanup-returning ref gets called with `null`.
-        // So in practice, it's safer to be defensive and always wrap the ref, even on React 19.
-        return (0, _react.useCallback)(
-          (current) => {
-            if (current === null) {
-              const cleanupFnA = cleanupA.current;
-              if (cleanupFnA) {
-                cleanupA.current = null;
-                cleanupFnA();
-              }
-              const cleanupFnB = cleanupB.current;
-              if (cleanupFnB) {
-                cleanupB.current = null;
-                cleanupFnB();
-              }
-            } else {
-              if (refA) {
-                cleanupA.current = applyRef(refA, current);
-              }
-              if (refB) {
-                cleanupB.current = applyRef(refB, current);
-              }
-            }
-          },
-          [refA, refB]
-        );
-      }
-      function applyRef(refA, current) {
-        if (typeof refA === "function") {
-          const cleanup = refA(current);
-          if (typeof cleanup === "function") {
-            return cleanup;
-          } else {
-            return () => refA(null);
-          }
-        } else {
-          refA.current = current;
-          return () => {
-            refA.current = null;
-          };
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=use-merged-ref.js.map
-
-      /***/
-    },
-
-    /***/ 4610: /***/ (
+    /***/ 8272: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -582,7 +662,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(7002);
       /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(9056);
+        __webpack_require__(7046);
       /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_link__WEBPACK_IMPORTED_MODULE_1__
@@ -613,115 +693,45 @@
       /***/
     },
 
-    /***/ 4806: /***/ (module, exports, __webpack_require__) => {
+    /***/ 8305: /***/ (__unused_webpack_module, exports) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
-      Object.defineProperty(exports, "useIntersection", {
+      Object.defineProperty(exports, "errorOnce", {
         enumerable: true,
         get: function () {
-          return useIntersection;
+          return errorOnce;
         },
       });
-      const _react = __webpack_require__(6466);
-      const _requestidlecallback = __webpack_require__(805);
-      const hasIntersectionObserver =
-        typeof IntersectionObserver === "function";
-      const observers = new Map();
-      const idList = [];
-      function createObserver(options) {
-        const id = {
-          root: options.root || null,
-          margin: options.rootMargin || "",
-        };
-        const existing = idList.find(
-          (obj) => obj.root === id.root && obj.margin === id.margin
-        );
-        let instance;
-        if (existing) {
-          instance = observers.get(existing);
-          if (instance) {
-            return instance;
-          }
+      let errorOnce = (_) => {};
+      if (false) {
+      } //# sourceMappingURL=error-once.js.map
+
+      /***/
+    },
+
+    /***/ 8319: /***/ (module, exports, __webpack_require__) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "getDomainLocale", {
+        enumerable: true,
+        get: function () {
+          return getDomainLocale;
+        },
+      });
+      const _normalizetrailingslash = __webpack_require__(6063);
+      const basePath =
+        /* unused pure expression or super */ null && (false || "");
+      function getDomainLocale(path, locale, locales, domainLocales) {
+        if (false) {
+        } else {
+          return false;
         }
-        const elements = new Map();
-        const observer = new IntersectionObserver((entries) => {
-          entries.forEach((entry) => {
-            const callback = elements.get(entry.target);
-            const isVisible =
-              entry.isIntersecting || entry.intersectionRatio > 0;
-            if (callback && isVisible) {
-              callback(isVisible);
-            }
-          });
-        }, options);
-        instance = {
-          id,
-          observer,
-          elements,
-        };
-        idList.push(id);
-        observers.set(id, instance);
-        return instance;
-      }
-      function observe(element, callback, options) {
-        const { id, observer, elements } = createObserver(options);
-        elements.set(element, callback);
-        observer.observe(element);
-        return function unobserve() {
-          elements.delete(element);
-          observer.unobserve(element);
-          // Destroy observer when there's nothing left to watch:
-          if (elements.size === 0) {
-            observer.disconnect();
-            observers.delete(id);
-            const index = idList.findIndex(
-              (obj) => obj.root === id.root && obj.margin === id.margin
-            );
-            if (index > -1) {
-              idList.splice(index, 1);
-            }
-          }
-        };
-      }
-      function useIntersection({ rootRef, rootMargin, disabled }) {
-        const isDisabled = disabled || !hasIntersectionObserver;
-        const [visible, setVisible] = (0, _react.useState)(false);
-        const elementRef = (0, _react.useRef)(null);
-        const setElement = (0, _react.useCallback)((element) => {
-          elementRef.current = element;
-        }, []);
-        (0, _react.useEffect)(() => {
-          if (hasIntersectionObserver) {
-            if (isDisabled || visible) return;
-            const element = elementRef.current;
-            if (element && element.tagName) {
-              const unobserve = observe(
-                element,
-                (isVisible) => isVisible && setVisible(isVisible),
-                {
-                  root: rootRef?.current,
-                  rootMargin,
-                }
-              );
-              return unobserve;
-            }
-          } else {
-            if (!visible) {
-              const idleCallback = (0,
-              _requestidlecallback.requestIdleCallback)(() => setVisible(true));
-              return () =>
-                (0, _requestidlecallback.cancelIdleCallback)(idleCallback);
-            }
-          }
-          // eslint-disable-next-line react-hooks/exhaustive-deps
-        }, [isDisabled, rootMargin, rootRef, visible, elementRef.current]);
-        const resetVisible = (0, _react.useCallback)(() => {
-          setVisible(false);
-        }, []);
-        return [setElement, visible, resetVisible];
       }
       if (
         (typeof exports.default === "function" ||
@@ -733,17 +743,7 @@
         });
         Object.assign(exports.default, exports);
         module.exports = exports.default;
-      } //# sourceMappingURL=use-intersection.js.map
-
-      /***/
-    },
-
-    /***/ 9056: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(1557);
+      } //# sourceMappingURL=get-domain-locale.js.map
 
       /***/
     },
@@ -753,7 +753,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(1182)
+      __webpack_exec__(2156)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for script-HASH.js

@@ -1,13 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 15: /***/ (module, __unused_webpack_exports, __webpack_require__) => {
-      module.exports = __webpack_require__(5258);
-
-      /***/
-    },
-
-    /***/ 6853: /***/ (
+    /***/ 2895: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -22,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(7002);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(15);
+        __webpack_require__(3489);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -55,7 +49,17 @@
       /***/
     },
 
-    /***/ 9264: /***/ (
+    /***/ 3489: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(3102);
+
+      /***/
+    },
+
+    /***/ 9884: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -63,7 +67,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/script",
         function () {
-          return __webpack_require__(6853);
+          return __webpack_require__(2895);
         },
       ]);
       if (false) {
@@ -77,7 +81,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9264)
+      __webpack_exec__(9884)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for withRouter-HASH.js

@@ -1,34 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 1593: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(372);
-
-      /***/
-    },
-
-    /***/ 4550: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/withRouter",
-        function () {
-          return __webpack_require__(8527);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 8527: /***/ (
+    /***/ 69: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(7002);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(1593);
+        __webpack_require__(2027);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -61,13 +34,40 @@
 
       /***/
     },
+
+    /***/ 2027: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(1536);
+
+      /***/
+    },
+
+    /***/ 2268: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/withRouter",
+        function () {
+          return __webpack_require__(69);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(4550)
+      __webpack_exec__(2268)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for 4951-HASH.js

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Diff for 8034-HASH.js

failed to diff

Diff for 9565-HASH.js

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Diff for main-HASH.js

Diff too large to display

Diff for main-app-HASH.js

@@ -1,64 +1,64 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4977],
   {
-    /***/ 1012: /***/ (
+    /***/ 905: /***/ () => {
+      /* (ignored) */
+      /***/
+    },
+
+    /***/ 8128: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5065, 23)
+        __webpack_require__.t.bind(__webpack_require__, 2467, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 8974, 23)
+        __webpack_require__.t.bind(__webpack_require__, 8296, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 6506, 23)
+        __webpack_require__.t.bind(__webpack_require__, 488, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 1, 23)
+        __webpack_require__.t.bind(__webpack_require__, 6887, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 8239, 23)
+        __webpack_require__.t.bind(__webpack_require__, 1753, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 1187, 23)
+        __webpack_require__.t.bind(__webpack_require__, 3265, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 7790, 23)
+        __webpack_require__.t.bind(__webpack_require__, 1848, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 6543, 23)
+        __webpack_require__.t.bind(__webpack_require__, 565, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5802, 23)
+        __webpack_require__.t.bind(__webpack_require__, 6732, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 2809, 23)
+        __webpack_require__.t.bind(__webpack_require__, 6439, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5738, 23)
+        __webpack_require__.t.bind(__webpack_require__, 228, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.bind(__webpack_require__, 5455)
+        __webpack_require__.bind(__webpack_require__, 3013)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 4731, 23)
+        __webpack_require__.t.bind(__webpack_require__, 8253, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 3753, 23)
+        __webpack_require__.t.bind(__webpack_require__, 3772, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 2816, 23)
+        __webpack_require__.t.bind(__webpack_require__, 5846, 23)
       );
 
       /***/
     },
-
-    /***/ 3643: /***/ () => {
-      /* (ignored) */
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
@@ -66,8 +66,8 @@
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(
       0,
-      [119, 8034],
-      () => (__webpack_exec__(5111), __webpack_exec__(1012))
+      [4246, 2914],
+      () => (__webpack_exec__(1429), __webpack_exec__(8128))
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Commit: ac60040

codspeed-hq · 2025-12-05T22:27:38Z

CodSpeed Performance Report

Merging #86885 will not alter performance

_{Comparing bgw/bincode-self-describing (ac60040) with canary (3c2fc61)}

Summary

✅ 17 untouched
⏩ 3 skipped¹

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

nextjs-bot · 2025-12-05T23:54:52Z

Failing test suites

Commit: ac60040 | About building and testing Next.js

pnpm test-start-turbo test/e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts (turbopack) (job)

runtime prefetching > cache stale time handling > includes public caches with cacheLife("seconds") (DD)

Expand output

● runtime prefetching › cache stale time handling › includes public caches with cacheLife("seconds")

thrown: "Exceeded timeout of 120000 ms for a test.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  739 |         path: '/caches/private-seconds',
  740 |       },
> 741 |     ])('$description', async ({ path, staticContent }) => {
      |      ^
  742 |       let page: Playwright.Page
  743 |       const browser = await next.browser('/', {
  744 |         beforePageLoad(p: Playwright.Page) {

  at ../node_modules/.pnpm/jest-each@29.7.0/node_modules/jest-each/build/bind.js:47:15
      at Array.forEach (<anonymous>)
  at e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts:741:6
  at describe (e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts:715:3)
  at Object.describe (e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts:6:1)

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Dec 5, 2025

bgw force-pushed the bgw/bincode-self-describing branch from 4b75e7e to 1295048 Compare December 5, 2025 22:03

vercel deleted a comment from nextjs-bot Dec 5, 2025

bgw requested a review from a team December 5, 2025 22:04

mischnic reviewed Dec 5, 2025

View reviewed changes

bgw force-pushed the bgw/bincode-self-describing branch from 1295048 to ec083f9 Compare December 5, 2025 23:36

bgw mentioned this pull request Dec 5, 2025

Turbopack: bincode: Remove automatic serde derives from #[turbo_tasks::value] macro #86634

Draft

bgw added 2 commits December 5, 2025 15:56

Turbopack: Add a custom serde_self_describing Serializer/Deserializer

b65b326

Use the new self-describing format, remove serde_json wrapper

ac60040

bgw force-pushed the bgw/bincode-self-describing branch from ec083f9 to ac60040 Compare December 5, 2025 23:56

bgw marked this pull request as ready for review December 6, 2025 00:05

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Turbopack: Add a custom serde_self_describing Serializer/Deserializer #86885

Turbopack: Add a custom serde_self_describing Serializer/Deserializer #86885

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Turbopack: Add a custom serde_self_describing Serializer/Deserializer #86885

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CodSpeed Performance Report

Merging #86885 will not alter performance

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bgw commented Dec 5, 2025 •

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