[Cache Components] Error for Sync IO in Server Components during Static Prerender #82500

gnoff · 2025-08-09T19:25:56Z

Currently we error if you cannot produce a shell unless you have a Suspense boundary above the root. This is fine for normal IO but sync IO like Math.random() and new Date() have much more significant bad consequences for prerendering. Instead of treating these errors as another flavor of "must have a shell" validation we should instead treat them like they must be guarded behind something else dynamic like await connection().

In addition to unconditionally erroring for Sync IO in Server Components when prerendering this change also removes the Sync IO warning for runtime prefetches. This is because at the moment there is no way to debug these errors in dev. In the future we will add validation for prefetches and need to add back in some ability to warn for these cases but until then we will leave this case as a silent deopt.

ijjk · 2025-08-09T19:30:19Z

Failing test suites

Commit: e97b58a

pnpm test-start test/e2e/app-dir/cache-components/cache-components.node-crypto.test.ts

cache-components > should prerender pages with cached require('node:crypto').randomInt(min, max) calls

Expand output

● cache-components › should prerender pages with cached require('node:crypto').randomInt(min, max) calls

expect(received).not.toEqual(expected) // deep equality

Expected: not "168"

  90 |       expect($('#layout').text()).toBe('at buildtime')
  91 |       expect($('#page').text()).toBe('at buildtime')
> 92 |       expect($('#first').text()).not.toEqual($('#second').text())
     |                                      ^
  93 |     }
  94 |   })
  95 |

  at Object.toEqual (e2e/app-dir/cache-components/cache-components.node-crypto.test.ts:92:38)

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

vercel

Additional Comments:

packages/next/src/client/components/client-page.tsx (lines 45-49):

Client components are calling async functions but expecting synchronous return values, which will cause runtime errors.

View Details

Analysis

The functions createSearchParamsFromClient and createParamsFromClient were changed from returning synchronous values to returning Promise<SearchParams> and Promise<Params> respectively. However, the client components in client-page.tsx and client-segment.tsx are still calling these functions and immediately passing the results as props to React components:

clientSearchParams = createSearchParamsFromClient(searchParams, store) // Now returns Promise<SearchParams>
clientParams = createParamsFromClient(params, store) // Now returns Promise<Params>

return <Component params={clientParams} searchParams={clientSearchParams} />

This means the React components will receive Promise objects instead of the actual params/searchParams data. When the components try to access properties (like params.id), they'll be accessing promise properties instead of the expected parameter values, causing runtime errors.

The same issue exists in client-segment.tsx on line 43 where createParamsFromClient is called but the result is used synchronously.

Recommendation

Update the client components to properly handle the async nature of these functions. This likely requires either:

Making the client components async and awaiting the function calls before rendering
Using React's use() hook or Suspense boundaries to handle the Promise resolution
Or reverting these specific functions to remain synchronous for client-side usage while creating separate async versions for server-side usage

The exact solution depends on the intended architecture, but the current code will definitely fail at runtime.

packages/next/src/server/request/search-params.ts

ijjk · 2025-08-09T19:33:15Z

Stats from current PR

Default Build (Increase detected ⚠️)

General

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Diff details

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           next_head__WEBPACK_IMPORTED_MODULE_1__
@@ -76,13 +59,30 @@
 
       /***/
     },
+
+    /***/ 8751: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/head",
+        function () {
+          return __webpack_require__(1992);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(3829)
+      __webpack_exec__(8751)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for hooks-HASH.js

@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [9804],
   {
-    /***/ 2452: /***/ (
+    /***/ 2227: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/hooks",
+        function () {
+          return __webpack_require__(2770);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 2770: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -59,30 +76,13 @@
 
       /***/
     },
-
-    /***/ 6105: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/hooks",
-        function () {
-          return __webpack_require__(2452);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(6105)
+      __webpack_exec__(2227)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for image-HASH.js

Diff too large to display

Diff for link-HASH.js

@@ -1,143 +1,82 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 1585: /***/ (module, exports, __webpack_require__) => {
+    /***/ 2346: /***/ (__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__(5977);
-      const _requestidlecallback = __webpack_require__(356);
-      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(param) {
-        let { rootRef, rootMargin, disabled } = param;
-        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 == null ? void 0 : 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
+      let errorOnce = (_) => {};
+      if (false) {
+      } //# sourceMappingURL=error-once.js.map
 
       /***/
     },
 
-    /***/ 2621: /***/ (
+    /***/ 2783: /***/ (
       module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(5410);
+      module.exports = __webpack_require__(5926);
 
       /***/
     },
 
-    /***/ 5410: /***/ (module, exports, __webpack_require__) => {
+    /***/ 4174: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      __webpack_require__.r(__webpack_exports__);
+      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
+        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
+        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
+        /* harmony export */
+      });
+      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
+        __webpack_require__(7765);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
+        __webpack_require__(2783);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
+        /*#__PURE__*/ __webpack_require__.n(
+          next_link__WEBPACK_IMPORTED_MODULE_1__
+        );
+
+      function aLink(props) {
+        return /*#__PURE__*/ (0,
+        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
+          children: [
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
+              children: "A Link page!",
+            }),
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
+              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
+              {
+                href: "/",
+                children: "Go to /",
+              }
+            ),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
+
+      /***/
+    },
+
+    /***/ 5926: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -164,17 +103,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(5977)
       );
-      const _resolvehref = __webpack_require__(224);
-      const _islocalurl = __webpack_require__(7746);
-      const _formaturl = __webpack_require__(315);
-      const _utils = __webpack_require__(8709);
-      const _addlocale = __webpack_require__(6358);
-      const _routercontextsharedruntime = __webpack_require__(4095);
-      const _useintersection = __webpack_require__(1585);
-      const _getdomainlocale = __webpack_require__(8802);
-      const _addbasepath = __webpack_require__(6151);
-      const _usemergedref = __webpack_require__(9100);
-      const _erroronce = __webpack_require__(9574);
+      const _resolvehref = __webpack_require__(6708);
+      const _islocalurl = __webpack_require__(6526);
+      const _formaturl = __webpack_require__(5575);
+      const _utils = __webpack_require__(3497);
+      const _addlocale = __webpack_require__(722);
+      const _routercontextsharedruntime = __webpack_require__(1235);
+      const _useintersection = __webpack_require__(8069);
+      const _getdomainlocale = __webpack_require__(9734);
+      const _addbasepath = __webpack_require__(4419);
+      const _usemergedref = __webpack_require__(6136);
+      const _erroronce = __webpack_require__(2346);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -563,43 +502,7 @@
       /***/
     },
 
-    /***/ 8802: /***/ (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__(1652);
-      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
-
-      /***/
-    },
-
-    /***/ 9100: /***/ (module, exports, __webpack_require__) => {
+    /***/ 6136: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -677,26 +580,7 @@
       /***/
     },
 
-    /***/ 9574: /***/ (__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
-
-      /***/
-    },
-
-    /***/ 9693: /***/ (
+    /***/ 7047: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -704,7 +588,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/link",
         function () {
-          return __webpack_require__(9948);
+          return __webpack_require__(4174);
         },
       ]);
       if (false) {
@@ -713,48 +597,164 @@
       /***/
     },
 
-    /***/ 9948: /***/ (
-      __unused_webpack_module,
-      __webpack_exports__,
-      __webpack_require__
-    ) => {
+    /***/ 8069: /***/ (module, exports, __webpack_require__) => {
       "use strict";
-      __webpack_require__.r(__webpack_exports__);
-      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
-        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
-        /* harmony export */
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
       });
-      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
-        __webpack_require__(7765);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(2621);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
-        /*#__PURE__*/ __webpack_require__.n(
-          next_link__WEBPACK_IMPORTED_MODULE_1__
+      Object.defineProperty(exports, "useIntersection", {
+        enumerable: true,
+        get: function () {
+          return useIntersection;
+        },
+      });
+      const _react = __webpack_require__(5977);
+      const _requestidlecallback = __webpack_require__(3432);
+      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
         );
-
-      function aLink(props) {
-        return /*#__PURE__*/ (0,
-        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
-          children: [
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
-              children: "A Link page!",
-            }),
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
-              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
-              {
-                href: "/",
-                children: "Go to /",
-              }
-            ),
-          ],
+        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(param) {
+        let { rootRef, rootMargin, disabled } = param;
+        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 == null ? void 0 : 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
+
+      /***/
+    },
+
+    /***/ 9734: /***/ (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__(504);
+      const basePath =
+        /* unused pure expression or super */ null && (false || "");
+      function getDomainLocale(path, locale, locales, domainLocales) {
+        if (false) {
+        } else {
+          return false;
+        }
       }
-      var __N_SSP = true;
-      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
+      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
 
       /***/
     },
@@ -764,7 +764,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9693)
+      __webpack_exec__(7047)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for script-HASH.js

@@ -1,7 +1,34 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 3699: /***/ (
+    /***/ 1008: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(2817);
+
+      /***/
+    },
+
+    /***/ 6951: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(8889);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 8889: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +43,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(7765);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4802);
+        __webpack_require__(1008);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -48,40 +75,13 @@
 
       /***/
     },
-
-    /***/ 4802: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(8661);
-
-      /***/
-    },
-
-    /***/ 7861: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(3699);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(7861)
+      __webpack_exec__(6951)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for 8863-HASH.js

@@ -1,8 +1,33 @@
 "use strict";
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
-  [8863],
+  [7009],
   {
-    /***/ 22: /***/ (module, exports, __webpack_require__) => {
+    /***/ 414: /***/ (
+      __unused_webpack_module,
+      exports,
+      __webpack_require__
+    ) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "AmpStateContext", {
+        enumerable: true,
+        get: function () {
+          return AmpStateContext;
+        },
+      });
+      const _interop_require_default = __webpack_require__(2726);
+      const _react = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(2224)
+      );
+      const AmpStateContext = _react.default.createContext({});
+      if (false) {
+      } //# sourceMappingURL=amp-context.shared-runtime.js.map
+
+      /***/
+    },
+
+    /***/ 1912: /***/ (module, exports, __webpack_require__) => {
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
@@ -12,7 +37,7 @@
           return useMergedRef;
         },
       });
-      const _react = __webpack_require__(2786);
+      const _react = __webpack_require__(2224);
       function useMergedRef(refA, refB) {
         const cleanupA = (0, _react.useRef)(null);
         const cleanupB = (0, _react.useRef)(null);
@@ -78,56 +103,99 @@
       /***/
     },
 
-    /***/ 936: /***/ (__unused_webpack_module, exports) => {
+    /***/ 2843: /***/ (
+      __unused_webpack_module,
+      exports,
+      __webpack_require__
+    ) => {
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
-      0 && 0;
-      function _export(target, all) {
-        for (var name in all)
-          Object.defineProperty(target, name, {
-            enumerable: true,
-            get: all[name],
-          });
-      }
-      _export(exports, {
-        VALID_LOADERS: function () {
-          return VALID_LOADERS;
+      Object.defineProperty(exports, "RouterContext", {
+        enumerable: true,
+        get: function () {
+          return RouterContext;
         },
-        imageConfigDefault: function () {
-          return imageConfigDefault;
+      });
+      const _interop_require_default = __webpack_require__(2726);
+      const _react = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(2224)
+      );
+      const RouterContext = _react.default.createContext(null);
+      if (false) {
+      } //# sourceMappingURL=router-context.shared-runtime.js.map
+
+      /***/
+    },
+
+    /***/ 3003: /***/ (__unused_webpack_module, exports) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "default", {
+        enumerable: true,
+        get: function () {
+          return _default;
         },
       });
-      const VALID_LOADERS = [
-        "default",
-        "imgix",
-        "cloudinary",
-        "akamai",
-        "custom",
-      ];
-      const imageConfigDefault = {
-        deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
-        imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
-        path: "/_next/image",
-        loader: "default",
-        loaderFile: "",
-        domains: [],
-        disableStaticImages: false,
-        minimumCacheTTL: 60,
-        formats: ["image/webp"],
-        dangerouslyAllowSVG: false,
-        contentSecurityPolicy: "script-src 'none'; frame-src 'none'; sandbox;",
-        contentDispositionType: "attachment",
-        localPatterns: undefined,
-        remotePatterns: [],
-        qualities: undefined,
-        unoptimized: false,
-      }; //# sourceMappingURL=image-config.js.map
+      const DEFAULT_Q = 75;
+      function defaultLoader(param) {
+        let { config, src, width, quality } = param;
+        var _config_qualities;
+        if (false) {
+        }
+        const q =
+          quality ||
+          ((_config_qualities = config.qualities) == null
+            ? void 0
+            : _config_qualities.reduce((prev, cur) =>
+                Math.abs(cur - DEFAULT_Q) < Math.abs(prev - DEFAULT_Q)
+                  ? cur
+                  : prev
+              )) ||
+          DEFAULT_Q;
+        return (
+          config.path +
+          "?url=" +
+          encodeURIComponent(src) +
+          "&w=" +
+          width +
+          "&q=" +
+          q +
+          (src.startsWith("/_next/static/media/") && false ? 0 : "")
+        );
+      }
+      // We use this to determine if the import is the default loader
+      // or a custom loader defined by the user in next.config.js
+      defaultLoader.__next_img_default = true;
+      const _default = defaultLoader; //# sourceMappingURL=image-loader.js.map
 
       /***/
     },
 
-    /***/ 1268: /***/ (__unused_webpack_module, exports) => {
+    /***/ 3810: /***/ (__unused_webpack_module, exports) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "isInAmpMode", {
+        enumerable: true,
+        get: function () {
+          return isInAmpMode;
+        },
+      });
+      function isInAmpMode(param) {
+        let {
+          ampFirst = false,
+          hybrid = false,
+          hasQuery = false,
+        } = param === void 0 ? {} : param;
+        return ampFirst || (hybrid && hasQuery);
+      } //# sourceMappingURL=amp-mode.js.map
+
+      /***/
+    },
+
+    /***/ 5218: /***/ (__unused_webpack_module, exports) => {
       /**
        * A shared function, used on both client and server, to generate a SVG blur placeholder.
        */
@@ -181,7 +249,7 @@
       /***/
     },
 
-    /***/ 1796: /***/ (module, exports, __webpack_require__) => {
+    /***/ 5402: /***/ (module, exports, __webpack_require__) => {
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
         value: true,
@@ -202,19 +270,19 @@
           return defaultHead;
         },
       });
-      const _interop_require_default = __webpack_require__(8182);
-      const _interop_require_wildcard = __webpack_require__(8319);
-      const _jsxruntime = __webpack_require__(1050);
+      const _interop_require_default = __webpack_require__(2726);
+      const _interop_require_wildcard = __webpack_require__(2527);
+      const _jsxruntime = __webpack_require__(8204);
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
-        __webpack_require__(2786)
+        __webpack_require__(2224)
       );
       const _sideeffect = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5581)
+        __webpack_require__(9319)
       );
-      const _ampcontextsharedruntime = __webpack_require__(3800);
-      const _headmanagercontextsharedruntime = __webpack_require__(4950);
-      const _ampmode = __webpack_require__(7824);
-      const _warnonce = __webpack_require__(2854);
+      const _ampcontextsharedruntime = __webpack_require__(414);
+      const _headmanagercontextsharedruntime = __webpack_require__(3100);
+      const _ampmode = __webpack_require__(3810);
+      const _warnonce = __webpack_require__(4504);
       function defaultHead(inAmpMode) {
         if (inAmpMode === void 0) inAmpMode = false;
         const head = [
@@ -379,7 +447,7 @@
       /***/
     },
 
-    /***/ 2843: /***/ (
+    /***/ 6745: /***/ (
       __unused_webpack_module,
       exports,
       __webpack_require__
@@ -393,9 +461,9 @@
           return getImgProps;
         },
       });
-      const _warnonce = __webpack_require__(2854);
-      const _imageblursvg = __webpack_require__(1268);
-      const _imageconfig = __webpack_require__(936);
+      const _warnonce = __webpack_require__(4504);
+      const _imageblursvg = __webpack_require__(5218);
+      const _imageconfig = __webpack_require__(9278);
       const VALID_LOADING_VALUES =
         /* unused pure expression or super */ null && [
           "lazy",
@@ -823,245 +891,7 @@
       /***/
     },
 
-    /***/ 3800: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "AmpStateContext", {
-        enumerable: true,
-        get: function () {
-          return AmpStateContext;
-        },
-      });
-      const _interop_require_default = __webpack_require__(8182);
-      const _react = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(2786)
-      );
-      const AmpStateContext = _react.default.createContext({});
-      if (false) {
-      } //# sourceMappingURL=amp-context.shared-runtime.js.map
-
-      /***/
-    },
-
-    /***/ 5581: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "default", {
-        enumerable: true,
-        get: function () {
-          return SideEffect;
-        },
-      });
-      const _react = __webpack_require__(2786);
-      const isServer = "object" === "undefined";
-      const useClientOnlyLayoutEffect = isServer
-        ? () => {}
-        : _react.useLayoutEffect;
-      const useClientOnlyEffect = isServer ? () => {} : _react.useEffect;
-      function SideEffect(props) {
-        const { headManager, reduceComponentsToState } = props;
-        function emitChange() {
-          if (headManager && headManager.mountedInstances) {
-            const headElements = _react.Children.toArray(
-              Array.from(headManager.mountedInstances).filter(Boolean)
-            );
-            headManager.updateHead(
-              reduceComponentsToState(headElements, props)
-            );
-          }
-        }
-        if (isServer) {
-          var _headManager_mountedInstances;
-          headManager == null
-            ? void 0
-            : (_headManager_mountedInstances = headManager.mountedInstances) ==
-              null
-            ? void 0
-            : _headManager_mountedInstances.add(props.children);
-          emitChange();
-        }
-        useClientOnlyLayoutEffect(() => {
-          var _headManager_mountedInstances;
-          headManager == null
-            ? void 0
-            : (_headManager_mountedInstances = headManager.mountedInstances) ==
-              null
-            ? void 0
-            : _headManager_mountedInstances.add(props.children);
-          return () => {
-            var _headManager_mountedInstances;
-            headManager == null
-              ? void 0
-              : (_headManager_mountedInstances =
-                  headManager.mountedInstances) == null
-              ? void 0
-              : _headManager_mountedInstances.delete(props.children);
-          };
-        });
-        // We need to call `updateHead` method whenever the `SideEffect` is trigger in all
-        // life-cycles: mount, update, unmount. However, if there are multiple `SideEffect`s
-        // being rendered, we only trigger the method from the last one.
-        // This is ensured by keeping the last unflushed `updateHead` in the `_pendingUpdate`
-        // singleton in the layout effect pass, and actually trigger it in the effect pass.
-        useClientOnlyLayoutEffect(() => {
-          if (headManager) {
-            headManager._pendingUpdate = emitChange;
-          }
-          return () => {
-            if (headManager) {
-              headManager._pendingUpdate = emitChange;
-            }
-          };
-        });
-        useClientOnlyEffect(() => {
-          if (headManager && headManager._pendingUpdate) {
-            headManager._pendingUpdate();
-            headManager._pendingUpdate = null;
-          }
-          return () => {
-            if (headManager && headManager._pendingUpdate) {
-              headManager._pendingUpdate();
-              headManager._pendingUpdate = null;
-            }
-          };
-        });
-        return null;
-      } //# sourceMappingURL=side-effect.js.map
-
-      /***/
-    },
-
-    /***/ 7053: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "RouterContext", {
-        enumerable: true,
-        get: function () {
-          return RouterContext;
-        },
-      });
-      const _interop_require_default = __webpack_require__(8182);
-      const _react = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(2786)
-      );
-      const RouterContext = _react.default.createContext(null);
-      if (false) {
-      } //# sourceMappingURL=router-context.shared-runtime.js.map
-
-      /***/
-    },
-
-    /***/ 7281: /***/ (__unused_webpack_module, exports) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "default", {
-        enumerable: true,
-        get: function () {
-          return _default;
-        },
-      });
-      const DEFAULT_Q = 75;
-      function defaultLoader(param) {
-        let { config, src, width, quality } = param;
-        var _config_qualities;
-        if (false) {
-        }
-        const q =
-          quality ||
-          ((_config_qualities = config.qualities) == null
-            ? void 0
-            : _config_qualities.reduce((prev, cur) =>
-                Math.abs(cur - DEFAULT_Q) < Math.abs(prev - DEFAULT_Q)
-                  ? cur
-                  : prev
-              )) ||
-          DEFAULT_Q;
-        return (
-          config.path +
-          "?url=" +
-          encodeURIComponent(src) +
-          "&w=" +
-          width +
-          "&q=" +
-          q +
-          (src.startsWith("/_next/static/media/") && false ? 0 : "")
-        );
-      }
-      // We use this to determine if the import is the default loader
-      // or a custom loader defined by the user in next.config.js
-      defaultLoader.__next_img_default = true;
-      const _default = defaultLoader; //# sourceMappingURL=image-loader.js.map
-
-      /***/
-    },
-
-    /***/ 7480: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "ImageConfigContext", {
-        enumerable: true,
-        get: function () {
-          return ImageConfigContext;
-        },
-      });
-      const _interop_require_default = __webpack_require__(8182);
-      const _react = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(2786)
-      );
-      const _imageconfig = __webpack_require__(936);
-      const ImageConfigContext = _react.default.createContext(
-        _imageconfig.imageConfigDefault
-      );
-      if (false) {
-      } //# sourceMappingURL=image-config-context.shared-runtime.js.map
-
-      /***/
-    },
-
-    /***/ 7824: /***/ (__unused_webpack_module, exports) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "isInAmpMode", {
-        enumerable: true,
-        get: function () {
-          return isInAmpMode;
-        },
-      });
-      function isInAmpMode(param) {
-        let {
-          ampFirst = false,
-          hybrid = false,
-          hasQuery = false,
-        } = param === void 0 ? {} : param;
-        return ampFirst || (hybrid && hasQuery);
-      } //# sourceMappingURL=amp-mode.js.map
-
-      /***/
-    },
-
-    /***/ 8863: /***/ (module, exports, __webpack_require__) => {
+    /***/ 7009: /***/ (module, exports, __webpack_require__) => {
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
         value: true,
@@ -1072,27 +902,27 @@
           return Image;
         },
       });
-      const _interop_require_default = __webpack_require__(8182);
-      const _interop_require_wildcard = __webpack_require__(8319);
-      const _jsxruntime = __webpack_require__(1050);
+      const _interop_require_default = __webpack_require__(2726);
+      const _interop_require_wildcard = __webpack_require__(2527);
+      const _jsxruntime = __webpack_require__(8204);
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
-        __webpack_require__(2786)
+        __webpack_require__(2224)
       );
       const _reactdom = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(1407)
+        __webpack_require__(1345)
       );
       const _head = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(1796)
+        __webpack_require__(5402)
       );
-      const _getimgprops = __webpack_require__(2843);
-      const _imageconfig = __webpack_require__(936);
-      const _imageconfigcontextsharedruntime = __webpack_require__(7480);
-      const _warnonce = __webpack_require__(2854);
-      const _routercontextsharedruntime = __webpack_require__(7053);
+      const _getimgprops = __webpack_require__(6745);
+      const _imageconfig = __webpack_require__(9278);
+      const _imageconfigcontextsharedruntime = __webpack_require__(9690);
+      const _warnonce = __webpack_require__(4504);
+      const _routercontextsharedruntime = __webpack_require__(2843);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(7281)
+        __webpack_require__(3003)
       );
-      const _usemergedref = __webpack_require__(22);
+      const _usemergedref = __webpack_require__(1912);
       // This is replaced by webpack define plugin
       const configEnv = {
         deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
@@ -1417,5 +1247,175 @@
 
       /***/
     },
+
+    /***/ 9278: /***/ (__unused_webpack_module, exports) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      0 && 0;
+      function _export(target, all) {
+        for (var name in all)
+          Object.defineProperty(target, name, {
+            enumerable: true,
+            get: all[name],
+          });
+      }
+      _export(exports, {
+        VALID_LOADERS: function () {
+          return VALID_LOADERS;
+        },
+        imageConfigDefault: function () {
+          return imageConfigDefault;
+        },
+      });
+      const VALID_LOADERS = [
+        "default",
+        "imgix",
+        "cloudinary",
+        "akamai",
+        "custom",
+      ];
+      const imageConfigDefault = {
+        deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
+        imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
+        path: "/_next/image",
+        loader: "default",
+        loaderFile: "",
+        domains: [],
+        disableStaticImages: false,
+        minimumCacheTTL: 60,
+        formats: ["image/webp"],
+        dangerouslyAllowSVG: false,
+        contentSecurityPolicy: "script-src 'none'; frame-src 'none'; sandbox;",
+        contentDispositionType: "attachment",
+        localPatterns: undefined,
+        remotePatterns: [],
+        qualities: undefined,
+        unoptimized: false,
+      }; //# sourceMappingURL=image-config.js.map
+
+      /***/
+    },
+
+    /***/ 9319: /***/ (
+      __unused_webpack_module,
+      exports,
+      __webpack_require__
+    ) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "default", {
+        enumerable: true,
+        get: function () {
+          return SideEffect;
+        },
+      });
+      const _react = __webpack_require__(2224);
+      const isServer = "object" === "undefined";
+      const useClientOnlyLayoutEffect = isServer
+        ? () => {}
+        : _react.useLayoutEffect;
+      const useClientOnlyEffect = isServer ? () => {} : _react.useEffect;
+      function SideEffect(props) {
+        const { headManager, reduceComponentsToState } = props;
+        function emitChange() {
+          if (headManager && headManager.mountedInstances) {
+            const headElements = _react.Children.toArray(
+              Array.from(headManager.mountedInstances).filter(Boolean)
+            );
+            headManager.updateHead(
+              reduceComponentsToState(headElements, props)
+            );
+          }
+        }
+        if (isServer) {
+          var _headManager_mountedInstances;
+          headManager == null
+            ? void 0
+            : (_headManager_mountedInstances = headManager.mountedInstances) ==
+              null
+            ? void 0
+            : _headManager_mountedInstances.add(props.children);
+          emitChange();
+        }
+        useClientOnlyLayoutEffect(() => {
+          var _headManager_mountedInstances;
+          headManager == null
+            ? void 0
+            : (_headManager_mountedInstances = headManager.mountedInstances) ==
+              null
+            ? void 0
+            : _headManager_mountedInstances.add(props.children);
+          return () => {
+            var _headManager_mountedInstances;
+            headManager == null
+              ? void 0
+              : (_headManager_mountedInstances =
+                  headManager.mountedInstances) == null
+              ? void 0
+              : _headManager_mountedInstances.delete(props.children);
+          };
+        });
+        // We need to call `updateHead` method whenever the `SideEffect` is trigger in all
+        // life-cycles: mount, update, unmount. However, if there are multiple `SideEffect`s
+        // being rendered, we only trigger the method from the last one.
+        // This is ensured by keeping the last unflushed `updateHead` in the `_pendingUpdate`
+        // singleton in the layout effect pass, and actually trigger it in the effect pass.
+        useClientOnlyLayoutEffect(() => {
+          if (headManager) {
+            headManager._pendingUpdate = emitChange;
+          }
+          return () => {
+            if (headManager) {
+              headManager._pendingUpdate = emitChange;
+            }
+          };
+        });
+        useClientOnlyEffect(() => {
+          if (headManager && headManager._pendingUpdate) {
+            headManager._pendingUpdate();
+            headManager._pendingUpdate = null;
+          }
+          return () => {
+            if (headManager && headManager._pendingUpdate) {
+              headManager._pendingUpdate();
+              headManager._pendingUpdate = null;
+            }
+          };
+        });
+        return null;
+      } //# sourceMappingURL=side-effect.js.map
+
+      /***/
+    },
+
+    /***/ 9690: /***/ (
+      __unused_webpack_module,
+      exports,
+      __webpack_require__
+    ) => {
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "ImageConfigContext", {
+        enumerable: true,
+        get: function () {
+          return ImageConfigContext;
+        },
+      });
+      const _interop_require_default = __webpack_require__(2726);
+      const _react = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(2224)
+      );
+      const _imageconfig = __webpack_require__(9278);
+      const ImageConfigContext = _react.default.createContext(
+        _imageconfig.imageConfigDefault
+      );
+      if (false) {
+      } //# sourceMappingURL=image-config-context.shared-runtime.js.map
+
+      /***/
+    },
   },
 ]);

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Commit: e97b58a

errors/next-prerender-current-time.mdx

test/e2e/app-dir/cache-components-errors/cache-components-errors.test.ts

errors/next-prerender-random.mdx

lubieowoce · 2025-08-20T13:00:06Z

LGTM other than the duplicate heading in the docs: https://github.com/vercel/next.js/pull/82500/files#r2286589387

Currently we error if you cannot produce a shell unless you have a Suspense boundary above the root. This is fine for normal IO but sync IO like Math.random() and new Date() have much more significant bad consequences for prerendering. Instead of treating these errors as another flavor of "must have a shell" validation we should instead treat them like they must be guarded behind something else dynamic like `await connection()`.

vercel · 2025-08-20T14:55:44Z

packages/next/src/server/app-render/dynamic-rendering.ts

+  if (serverDynamic.syncDynamicErrorWithStack) {
+    logDisallowedDynamicError(
+      workStore,
+      serverDynamic.syncDynamicErrorWithStack
+    )
+    throw new StaticGenBailoutError()
+  }


Critical behavioral change: sync dynamic errors now fail immediately even when properly wrapped in Suspense boundaries, breaking previously valid patterns.

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📝 Patch Details

diff --git a/packages/next/src/server/app-render/dynamic-rendering.ts b/packages/next/src/server/app-render/dynamic-rendering.ts index 2c88cd8e0b..492512254d 100644 --- a/packages/next/src/server/app-render/dynamic-rendering.ts +++ b/packages/next/src/server/app-render/dynamic-rendering.ts @@ -763,14 +763,6 @@ export function throwIfDisallowedDynamic( dynamicValidation: DynamicValidationState, serverDynamic: DynamicTrackingState ): void { - if (serverDynamic.syncDynamicErrorWithStack) { - logDisallowedDynamicError( - workStore, - serverDynamic.syncDynamicErrorWithStack - ) - throw new StaticGenBailoutError() - } - if (prelude !== PreludeState.Full) { if (dynamicValidation.hasSuspenseAboveBody) { // This route has opted into allowing fully dynamic rendering @@ -779,6 +771,14 @@ export function throwIfDisallowedDynamic( return } + if (serverDynamic.syncDynamicErrorWithStack) { + logDisallowedDynamicError( + workStore, + serverDynamic.syncDynamicErrorWithStack + ) + throw new StaticGenBailoutError() + } + // We didn't have any sync bailouts but there may be user code which // blocked the root. We would have captured these during the prerender // and can log them here and then terminate the build/validating render

Analysis

The logic in throwIfDisallowedDynamic was changed to check serverDynamic.syncDynamicErrorWithStack before checking the prelude state and Suspense boundaries. This is a breaking change that contradicts the intended behavior.

Previous behavior (correct): Sync dynamic errors (like Math.random()) were only treated as failures when there wasn't proper Suspense boundary coverage (prelude !== PreludeState.Full). This allowed pages with proper Suspense boundaries to use these APIs safely during prerendering.

New behavior (incorrect): Sync dynamic errors now always cause immediate failures regardless of Suspense boundary coverage, breaking pages that were previously working correctly.

The test case /sync-random-with-fallback demonstrates this - its comment explicitly states "This is fine and doesn't need to error the build" because it has proper Suspense boundaries, but the behavior change makes it fail. The test expectations were updated to match the new broken behavior instead of fixing the logic bug.

This affects real applications where developers have correctly wrapped dynamic operations in Suspense boundaries as recommended by Next.js documentation, but those patterns will now start failing after this change.

Recommendation

Move the syncDynamicErrorWithStack check back inside the if (prelude !== PreludeState.Full) block, before the hasSuspenseAboveBody check, to restore the correct behavior:

export function throwIfDisallowedDynamic( workStore: WorkStore, prelude: PreludeState, dynamicValidation: DynamicValidationState, serverDynamic: DynamicTrackingState ): void { if (prelude !== PreludeState.Full) { if (dynamicValidation.hasSuspenseAboveBody) { // This route has opted into allowing fully dynamic rendering // by including a Suspense boundary above the body. In this case // a lack of a shell is not considered disallowed so we simply return return } if (serverDynamic.syncDynamicErrorWithStack) { logDisallowedDynamicError( workStore, serverDynamic.syncDynamicErrorWithStack ) throw new StaticGenBailoutError() } // ... rest of the logic } }

Also revert the corresponding test expectations that were changed to accommodate this incorrect behavior.

ijjk added created-by: Next.js team PRs by the Next.js team. Documentation Related to Next.js' official documentation. tests type: next labels Aug 9, 2025

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austinderek mentioned this pull request Aug 9, 2025

[Cache Components] Error for sync IO in prerender in Server Components austinderek/next.js#227

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gnoff force-pushed the error-on-sync-io-in-rsc branch from 0721c48 to 8a68e1d Compare August 19, 2025 05:15

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gnoff changed the title ~~[Cache Components] Error for sync IO in prerender in Server Components~~ [Cache Components] Error for Sync IO in Server Components during Static Prerender Aug 20, 2025

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gnoff force-pushed the error-on-sync-io-in-rsc branch from ef34b67 to e97b58a Compare August 20, 2025 14:46

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gnoff merged commit ed5d085 into vercel:canary Aug 20, 2025
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gnoff deleted the error-on-sync-io-in-rsc branch August 20, 2025 15:27

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[Cache Components] Error for Sync IO in Server Components during Static Prerender #82500

[Cache Components] Error for Sync IO in Server Components during Static Prerender #82500

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[Cache Components] Error for Sync IO in Server Components during Static Prerender #82500

[Cache Components] Error for Sync IO in Server Components during Static Prerender #82500

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