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CI: Enable `experimental.isolatedDevBuild` for `test-integration` by devjiwonchoi · Pull Request #84558 · vercel/next.js · GitHub
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@devjiwonchoi devjiwonchoi commented Oct 6, 2025

Enabling experimental.isolatedDevBuild required many changes to the current workflow, so we will incrementally roll out to the tests.

Enabling on test-integration instead of test-experimental-integration because -experimental CIs are filtered via experimental-tests-manifest.json and they don't cover all tests. We want to enable this feature by default so we should ensure this incremental rollout is covered on all test cases.

  1. test-experimental-dev (link)
  2. test-dev (link)
  3. test-prod (link)
  4. test-integration (here)
  5. test-unit
  6. Enable by default, remove the flag, and update the rest

x-ref: #84043

@ijjk ijjk added the created-by: Next.js team PRs by the Next.js team. label Oct 6, 2025
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devjiwonchoi commented Oct 6, 2025

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ijjk commented Oct 6, 2025

Failing test suites

Commit: a6b32ad | About building and testing Next.js

pnpm test test/integration/next-image-new/default/test/static.test.ts (turbopack)

  • Static Image Component Tests > development mode > Should allow an image with a static src to omit height and width (DD)
Expand output

● Static Image Component Tests › development mode › Should allow an image with a static src to omit height and width

page.waitForSelector: Timeout 5000ms exceeded.
Call log:
  - waiting for locator('#basic-static') to be visible

  511 |
  512 |     return this.startChain(async () => {
> 513 |       const el = await page.waitForSelector(selector, {
      |                             ^
  514 |         timeout,
  515 |         state,
  516 |       })

  at waitForSelector (lib/browsers/playwright.ts:513:29)
  at Playwright._chain (lib/browsers/playwright.ts:643:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:624:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:512:17)
  at Playwright.waitForElementByCss [as elementByCss] (lib/browsers/playwright.ts:397:17)
  at Playwright.elementByCss [as elementById] (lib/browsers/playwright.ts:417:17)
  at Object.elementById (integration/next-image-new/default/test/static.test.ts:26:26)

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ijjk commented Oct 6, 2025

Stats from current PR

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+              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
+              {
+                href: "/",
+                children: "Go to /",
+              }
+            ),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
+
+      /***/
+    },
+
+    /***/ 4308: /***/ (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__(2223);
+      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
+
+      /***/
+    },
+
+    /***/ 4554: /***/ (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__(7740);
+      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
+
+      /***/
+    },
+
+    /***/ 6873: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -364,7 +541,7 @@
         },
       });
       const _react = __webpack_require__(2223);
-      const _requestidlecallback = __webpack_require__(1472);
+      const _requestidlecallback = __webpack_require__(6892);
       const hasIntersectionObserver =
         typeof IntersectionObserver === "function";
       const observers = new Map();
@@ -476,189 +653,12 @@
       /***/
     },
 
-    /***/ 4206: /***/ (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__(6704);
-      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
-
-      /***/
-    },
-
-    /***/ 6691: /***/ (
+    /***/ 6929: /***/ (
       module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(3262);
-
-      /***/
-    },
-
-    /***/ 6771: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/link",
-        function () {
-          return __webpack_require__(8178);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 6848: /***/ (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__(2223);
-      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
-
-      /***/
-    },
-
-    /***/ 8178: /***/ (
-      __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__(1503);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(6691);
-      /* 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;
+      module.exports = __webpack_require__(3066);
 
       /***/
     },
@@ -668,7 +668,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(6771)
+      __webpack_exec__(2025)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for routerDirect-HASH.js
@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [188],
   {
-    /***/ 286: /***/ (
+    /***/ 417: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/routerDirect",
+        function () {
+          return __webpack_require__(504);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 504: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +33,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1503);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(7798);
+        __webpack_require__(1840);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -36,29 +53,12 @@
       /***/
     },
 
-    /***/ 4283: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/routerDirect",
-        function () {
-          return __webpack_require__(286);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 7798: /***/ (
+    /***/ 1840: /***/ (
       module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(9587);
+      module.exports = __webpack_require__(1903);
 
       /***/
     },
@@ -68,7 +68,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(4283)
+      __webpack_exec__(417)
     );
     /******/ 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],
   {
-    /***/ 661: /***/ (
+    /***/ 2398: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(2397);
+
+      /***/
+    },
+
+    /***/ 4305: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(8543);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 8543: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +43,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1503);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(5964);
+        __webpack_require__(2398);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -48,40 +75,13 @@
 
       /***/
     },
-
-    /***/ 5964: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(297);
-
-      /***/
-    },
-
-    /***/ 8803: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(661);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(8803)
+      __webpack_exec__(4305)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for withRouter-HASH.js
@@ -1,24 +1,17 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 3163: /***/ (
-      __unused_webpack_module,
+    /***/ 1840: /***/ (
+      module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/withRouter",
-        function () {
-          return __webpack_require__(3295);
-        },
-      ]);
-      if (false) {
-      }
+      module.exports = __webpack_require__(1903);
 
       /***/
     },
 
-    /***/ 3295: /***/ (
+    /***/ 2037: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -33,7 +26,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1503);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(7798);
+        __webpack_require__(1840);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -52,12 +45,19 @@
       /***/
     },
 
-    /***/ 7798: /***/ (
-      module,
+    /***/ 4041: /***/ (
+      __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(9587);
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/withRouter",
+        function () {
+          return __webpack_require__(2037);
+        },
+      ]);
+      if (false) {
+      }
 
       /***/
     },
@@ -67,7 +67,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(3163)
+      __webpack_exec__(4041)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for 4498-HASH.js

Diff too large to display

Diff for 9225-HASH.js
@@ -1,32 +1,81 @@
 "use strict";
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
-  [9225],
+  [8439],
   {
-    /***/ 2: /***/ (__unused_webpack_module, exports, __webpack_require__) => {
+    /***/ 405: /***/ (
+      __unused_webpack_module,
+      exports,
+      __webpack_require__
+    ) => {
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
-      Object.defineProperty(exports, "ImageConfigContext", {
+      Object.defineProperty(exports, "default", {
         enumerable: true,
         get: function () {
-          return ImageConfigContext;
+          return SideEffect;
         },
       });
-      const _interop_require_default = __webpack_require__(9010);
-      const _react = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(8879)
-      );
-      const _imageconfig = __webpack_require__(1686);
-      const ImageConfigContext = _react.default.createContext(
-        _imageconfig.imageConfigDefault
-      );
-      if (false) {
-      } //# sourceMappingURL=image-config-context.shared-runtime.js.map
+      const _react = __webpack_require__(1774);
+      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));
+          }
+        }
+        if (isServer) {
+          headManager?.mountedInstances?.add(props.children);
+          emitChange();
+        }
+        useClientOnlyLayoutEffect(() => {
+          headManager?.mountedInstances?.add(props.children);
+          return () => {
+            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
 
       /***/
     },
 
-    /***/ 1169: /***/ (
+    /***/ 1155: /***/ (
       __unused_webpack_module,
       exports,
       __webpack_require__
@@ -40,9 +89,9 @@
           return getImgProps;
         },
       });
-      const _warnonce = __webpack_require__(4352);
-      const _imageblursvg = __webpack_require__(2314);
-      const _imageconfig = __webpack_require__(1686);
+      const _warnonce = __webpack_require__(5358);
+      const _imageblursvg = __webpack_require__(6924);
+      const _imageconfig = __webpack_require__(9712);
       const VALID_LOADING_VALUES =
         /* unused pure expression or super */ null && [
           "lazy",
@@ -473,241 +522,40 @@
       /***/
     },
 
-    /***/ 1666: /***/ (module, exports, __webpack_require__) => {
-      /* __next_internal_client_entry_do_not_use__  cjs */
+    /***/ 1417: /***/ (
+      __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, {
-        default: function () {
+      Object.defineProperty(exports, "default", {
+        enumerable: true,
+        get: function () {
           return _default;
         },
-        defaultHead: function () {
-          return defaultHead;
-        },
       });
-      const _interop_require_default = __webpack_require__(9010);
-      const _interop_require_wildcard = __webpack_require__(2275);
-      const _jsxruntime = __webpack_require__(1024);
-      const _react = /*#__PURE__*/ _interop_require_wildcard._(
-        __webpack_require__(8879)
-      );
-      const _sideeffect = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(2543)
-      );
-      const _headmanagercontextsharedruntime = __webpack_require__(5428);
-      const _warnonce = __webpack_require__(4352);
-      function defaultHead() {
-        const head = [
-          /*#__PURE__*/ (0, _jsxruntime.jsx)(
-            "meta",
-            {
-              charSet: "utf-8",
-            },
-            "charset"
-          ),
-          /*#__PURE__*/ (0, _jsxruntime.jsx)(
-            "meta",
-            {
-              name: "viewport",
-              content: "width=device-width",
-            },
-            "viewport"
-          ),
-        ];
-        return head;
-      }
-      function onlyReactElement(list, child) {
-        // React children can be "string" or "number" in this case we ignore them for backwards compat
-        if (typeof child === "string" || typeof child === "number") {
-          return list;
-        }
-        // Adds support for React.Fragment
-        if (child.type === _react.default.Fragment) {
-          return list.concat(
-            _react.default.Children.toArray(child.props.children).reduce(
-              (fragmentList, fragmentChild) => {
-                if (
-                  typeof fragmentChild === "string" ||
-                  typeof fragmentChild === "number"
-                ) {
-                  return fragmentList;
-                }
-                return fragmentList.concat(fragmentChild);
-              },
-              []
-            )
-          );
+      const _findclosestquality = __webpack_require__(1639);
+      function defaultLoader({ config, src, width, quality }) {
+        if (false) {
         }
-        return list.concat(child);
-      }
-      const METATYPES = ["name", "httpEquiv", "charSet", "itemProp"];
-      /*
- returns a function for filtering head child elements
- which shouldn't be duplicated, like <title/>
- Also adds support for deduplicated `key` properties
-*/ function unique() {
-        const keys = new Set();
-        const tags = new Set();
-        const metaTypes = new Set();
-        const metaCategories = {};
-        return (h) => {
-          let isUnique = true;
-          let hasKey = false;
-          if (h.key && typeof h.key !== "number" && h.key.indexOf("$") > 0) {
-            hasKey = true;
-            const key = h.key.slice(h.key.indexOf("$") + 1);
-            if (keys.has(key)) {
-              isUnique = false;
-            } else {
-              keys.add(key);
-            }
-          }
-          // eslint-disable-next-line default-case
-          switch (h.type) {
-            case "title":
-            case "base":
-              if (tags.has(h.type)) {
-                isUnique = false;
-              } else {
-                tags.add(h.type);
-              }
-              break;
-            case "meta":
-              for (let i = 0, len = METATYPES.length; i < len; i++) {
-                const metatype = METATYPES[i];
-                if (!h.props.hasOwnProperty(metatype)) continue;
-                if (metatype === "charSet") {
-                  if (metaTypes.has(metatype)) {
-                    isUnique = false;
-                  } else {
-                    metaTypes.add(metatype);
-                  }
-                } else {
-                  const category = h.props[metatype];
-                  const categories = metaCategories[metatype] || new Set();
-                  if (
-                    (metatype !== "name" || !hasKey) &&
-                    categories.has(category)
-                  ) {
-                    isUnique = false;
-                  } else {
-                    categories.add(category);
-                    metaCategories[metatype] = categories;
-                  }
-                }
-              }
-              break;
-          }
-          return isUnique;
-        };
-      }
-      /**
-       *
-       * @param headChildrenElements List of children of <Head>
-       */ function reduceComponents(headChildrenElements) {
-        return headChildrenElements
-          .reduce(onlyReactElement, [])
-          .reverse()
-          .concat(defaultHead().reverse())
-          .filter(unique())
-          .reverse()
-          .map((c, i) => {
-            const key = c.key || i;
-            if (false) {
-            }
-            return /*#__PURE__*/ _react.default.cloneElement(c, {
-              key,
-            });
-          });
-      }
-      /**
-       * This component injects elements to `<head>` of your page.
-       * To avoid duplicated `tags` in `<head>` you can use the `key` property, which will make sure every tag is only rendered once.
-       */ function Head({ children }) {
-        const headManager = (0, _react.useContext)(
-          _headmanagercontextsharedruntime.HeadManagerContext
-        );
-        return /*#__PURE__*/ (0, _jsxruntime.jsx)(_sideeffect.default, {
-          reduceComponentsToState: reduceComponents,
-          headManager: headManager,
-          children: children,
-        });
-      }
-      const _default = Head;
-      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=head.js.map
-
-      /***/
-    },
-
-    /***/ 1686: /***/ (__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],
-          });
+        const q = (0, _findclosestquality.findClosestQuality)(quality, config);
+        return `${config.path}?url=${encodeURIComponent(
+          src
+        )}&w=${width}&q=${q}${
+          src.startsWith("/_next/static/media/") && false ? 0 : ""
+        }`;
       }
-      _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: 14400,
-        formats: ["image/webp"],
-        dangerouslyAllowSVG: false,
-        contentSecurityPolicy: `script-src 'none'; frame-src 'none'; sandbox;`,
-        contentDispositionType: "attachment",
-        localPatterns: undefined,
-        remotePatterns: [],
-        qualities: [75],
-        unoptimized: false,
-      }; //# sourceMappingURL=image-config.js.map
+      // 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
 
       /***/
     },
 
-    /***/ 2285: /***/ (__unused_webpack_module, exports) => {
+    /***/ 1639: /***/ (__unused_webpack_module, exports) => {
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
@@ -731,7 +579,35 @@
       /***/
     },
 
-    /***/ 2314: /***/ (__unused_webpack_module, exports) => {
+    /***/ 2896: /***/ (
+      __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__(2570);
+      const _react = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(1774)
+      );
+      const _imageconfig = __webpack_require__(9712);
+      const ImageConfigContext = _react.default.createContext(
+        _imageconfig.imageConfigDefault
+      );
+      if (false) {
+      } //# sourceMappingURL=image-config-context.shared-runtime.js.map
+
+      /***/
+    },
+
+    /***/ 6924: /***/ (__unused_webpack_module, exports) => {
       /**
        * A shared function, used on both client and server, to generate a SVG blur placeholder.
        */
@@ -770,113 +646,7 @@
       /***/
     },
 
-    /***/ 2543: /***/ (
-      __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__(8879);
-      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));
-          }
-        }
-        if (isServer) {
-          headManager?.mountedInstances?.add(props.children);
-          emitChange();
-        }
-        useClientOnlyLayoutEffect(() => {
-          headManager?.mountedInstances?.add(props.children);
-          return () => {
-            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
-
-      /***/
-    },
-
-    /***/ 8035: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "default", {
-        enumerable: true,
-        get: function () {
-          return _default;
-        },
-      });
-      const _findclosestquality = __webpack_require__(2285);
-      function defaultLoader({ config, src, width, quality }) {
-        if (false) {
-        }
-        const q = (0, _findclosestquality.findClosestQuality)(quality, config);
-        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
-
-      /***/
-    },
-
-    /***/ 8848: /***/ (module, exports, __webpack_require__) => {
+    /***/ 7614: /***/ (module, exports, __webpack_require__) => {
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
@@ -886,7 +656,7 @@
           return useMergedRef;
         },
       });
-      const _react = __webpack_require__(8879);
+      const _react = __webpack_require__(1774);
       function useMergedRef(refA, refB) {
         const cleanupA = (0, _react.useRef)(null);
         const cleanupB = (0, _react.useRef)(null);
@@ -952,32 +722,7 @@
       /***/
     },
 
-    /***/ 9059: /***/ (
-      __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__(9010);
-      const _react = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(8879)
-      );
-      const RouterContext = _react.default.createContext(null);
-      if (false) {
-      } //# sourceMappingURL=router-context.shared-runtime.js.map
-
-      /***/
-    },
-
-    /***/ 9225: /***/ (module, exports, __webpack_require__) => {
+    /***/ 8439: /***/ (module, exports, __webpack_require__) => {
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
         value: true,
@@ -988,27 +733,27 @@
           return Image;
         },
       });
-      const _interop_require_default = __webpack_require__(9010);
-      const _interop_require_wildcard = __webpack_require__(2275);
-      const _jsxruntime = __webpack_require__(1024);
+      const _interop_require_default = __webpack_require__(2570);
+      const _interop_require_wildcard = __webpack_require__(5643);
+      const _jsxruntime = __webpack_require__(2014);
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
-        __webpack_require__(8879)
+        __webpack_require__(1774)
       );
       const _reactdom = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(3869)
+        __webpack_require__(7499)
       );
       const _head = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(1666)
+        __webpack_require__(9452)
       );
-      const _getimgprops = __webpack_require__(1169);
-      const _imageconfig = __webpack_require__(1686);
-      const _imageconfigcontextsharedruntime = __webpack_require__(2);
-      const _warnonce = __webpack_require__(4352);
-      const _routercontextsharedruntime = __webpack_require__(9059);
+      const _getimgprops = __webpack_require__(1155);
+      const _imageconfig = __webpack_require__(9712);
+      const _imageconfigcontextsharedruntime = __webpack_require__(2896);
+      const _warnonce = __webpack_require__(5358);
+      const _routercontextsharedruntime = __webpack_require__(9813);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(8035)
+        __webpack_require__(1417)
       );
-      const _usemergedref = __webpack_require__(8848);
+      const _usemergedref = __webpack_require__(7614);
       // This is replaced by webpack define plugin
       const configEnv = {
         deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
@@ -1329,5 +1074,264 @@
 
       /***/
     },
+
+    /***/ 9452: /***/ (module, exports, __webpack_require__) => {
+      /* __next_internal_client_entry_do_not_use__  cjs */
+      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, {
+        default: function () {
+          return _default;
+        },
+        defaultHead: function () {
+          return defaultHead;
+        },
+      });
+      const _interop_require_default = __webpack_require__(2570);
+      const _interop_require_wildcard = __webpack_require__(5643);
+      const _jsxruntime = __webpack_require__(2014);
+      const _react = /*#__PURE__*/ _interop_require_wildcard._(
+        __webpack_require__(1774)
+      );
+      const _sideeffect = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(405)
+      );
+      const _headmanagercontextsharedruntime = __webpack_require__(5326);
+      const _warnonce = __webpack_require__(5358);
+      function defaultHead() {
+        const head = [
+          /*#__PURE__*/ (0, _jsxruntime.jsx)(
+            "meta",
+            {
+              charSet: "utf-8",
+            },
+            "charset"
+          ),
+          /*#__PURE__*/ (0, _jsxruntime.jsx)(
+            "meta",
+            {
+              name: "viewport",
+              content: "width=device-width",
+            },
+            "viewport"
+          ),
+        ];
+        return head;
+      }
+      function onlyReactElement(list, child) {
+        // React children can be "string" or "number" in this case we ignore them for backwards compat
+        if (typeof child === "string" || typeof child === "number") {
+          return list;
+        }
+        // Adds support for React.Fragment
+        if (child.type === _react.default.Fragment) {
+          return list.concat(
+            _react.default.Children.toArray(child.props.children).reduce(
+              (fragmentList, fragmentChild) => {
+                if (
+                  typeof fragmentChild === "string" ||
+                  typeof fragmentChild === "number"
+                ) {
+                  return fragmentList;
+                }
+                return fragmentList.concat(fragmentChild);
+              },
+              []
+            )
+          );
+        }
+        return list.concat(child);
+      }
+      const METATYPES = ["name", "httpEquiv", "charSet", "itemProp"];
+      /*
+ returns a function for filtering head child elements
+ which shouldn't be duplicated, like <title/>
+ Also adds support for deduplicated `key` properties
+*/ function unique() {
+        const keys = new Set();
+        const tags = new Set();
+        const metaTypes = new Set();
+        const metaCategories = {};
+        return (h) => {
+          let isUnique = true;
+          let hasKey = false;
+          if (h.key && typeof h.key !== "number" && h.key.indexOf("$") > 0) {
+            hasKey = true;
+            const key = h.key.slice(h.key.indexOf("$") + 1);
+            if (keys.has(key)) {
+              isUnique = false;
+            } else {
+              keys.add(key);
+            }
+          }
+          // eslint-disable-next-line default-case
+          switch (h.type) {
+            case "title":
+            case "base":
+              if (tags.has(h.type)) {
+                isUnique = false;
+              } else {
+                tags.add(h.type);
+              }
+              break;
+            case "meta":
+              for (let i = 0, len = METATYPES.length; i < len; i++) {
+                const metatype = METATYPES[i];
+                if (!h.props.hasOwnProperty(metatype)) continue;
+                if (metatype === "charSet") {
+                  if (metaTypes.has(metatype)) {
+                    isUnique = false;
+                  } else {
+                    metaTypes.add(metatype);
+                  }
+                } else {
+                  const category = h.props[metatype];
+                  const categories = metaCategories[metatype] || new Set();
+                  if (
+                    (metatype !== "name" || !hasKey) &&
+                    categories.has(category)
+                  ) {
+                    isUnique = false;
+                  } else {
+                    categories.add(category);
+                    metaCategories[metatype] = categories;
+                  }
+                }
+              }
+              break;
+          }
+          return isUnique;
+        };
+      }
+      /**
+       *
+       * @param headChildrenElements List of children of <Head>
+       */ function reduceComponents(headChildrenElements) {
+        return headChildrenElements
+          .reduce(onlyReactElement, [])
+          .reverse()
+          .concat(defaultHead().reverse())
+          .filter(unique())
+          .reverse()
+          .map((c, i) => {
+            const key = c.key || i;
+            if (false) {
+            }
+            return /*#__PURE__*/ _react.default.cloneElement(c, {
+              key,
+            });
+          });
+      }
+      /**
+       * This component injects elements to `<head>` of your page.
+       * To avoid duplicated `tags` in `<head>` you can use the `key` property, which will make sure every tag is only rendered once.
+       */ function Head({ children }) {
+        const headManager = (0, _react.useContext)(
+          _headmanagercontextsharedruntime.HeadManagerContext
+        );
+        return /*#__PURE__*/ (0, _jsxruntime.jsx)(_sideeffect.default, {
+          reduceComponentsToState: reduceComponents,
+          headManager: headManager,
+          children: children,
+        });
+      }
+      const _default = Head;
+      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=head.js.map
+
+      /***/
+    },
+
+    /***/ 9712: /***/ (__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: 14400,
+        formats: ["image/webp"],
+        dangerouslyAllowSVG: false,
+        contentSecurityPolicy: `script-src 'none'; frame-src 'none'; sandbox;`,
+        contentDispositionType: "attachment",
+        localPatterns: undefined,
+        remotePatterns: [],
+        qualities: [75],
+        unoptimized: false,
+      }; //# sourceMappingURL=image-config.js.map
+
+      /***/
+    },
+
+    /***/ 9813: /***/ (
+      __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__(2570);
+      const _react = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(1774)
+      );
+      const RouterContext = _react.default.createContext(null);
+      if (false) {
+      } //# sourceMappingURL=router-context.shared-runtime.js.map
+
+      /***/
+    },
   },
 ]);
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Diff for pages-api.runtime.dev.js

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Commit: a6b32ad

@devjiwonchoi devjiwonchoi marked this pull request as ready for review October 6, 2025 10:28
@devjiwonchoi devjiwonchoi requested review from bgw, ijjk and ztanner October 6, 2025 10:32
@devjiwonchoi devjiwonchoi changed the title CI: Enable experimental.isolatedDevBuild for test-experimental-integration CI: Enable experimental.isolatedDevBuild for test-integration Oct 6, 2025
@ijjk ijjk added the tests label Oct 6, 2025
}

export function getDistDir(isNextDev?: boolean): '.next' | '.next/dev' {
export function getDistDir(): '.next' | '.next/dev' {
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@vercel vercel bot Oct 6, 2025

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The getDistDir() function cannot detect development mode for integration tests, causing it to return .next instead of .next/dev when __NEXT_EXPERIMENTAL_ISOLATED_DEV_BUILD=true. This will break integration tests that read files from the dist directory in development mode.

View Details
📝 Patch Details
diff --git a/test/lib/next-test-utils.ts b/test/lib/next-test-utils.ts
index 740ea159e1..7bfe889eff 100644
--- a/test/lib/next-test-utils.ts
+++ b/test/lib/next-test-utils.ts
@@ -470,6 +470,13 @@ export function launchApp(
   const options = opts ?? {}
   const useTurbo = shouldUseTurbopack()
 
+  // Set NEXT_TEST_MODE for integration tests so getDistDir() can detect dev mode
+  // This is needed when __NEXT_EXPERIMENTAL_ISOLATED_DEV_BUILD is enabled,
+  // to ensure getDistDir() returns '.next/dev' matching the server's distDir
+  if (!process.env.NEXT_TEST_MODE) {
+    process.env.NEXT_TEST_MODE = 'dev'
+  }
+
   return runNextCommandDev(
     [
       useTurbo ? '--turbopack' : undefined,
@@ -525,6 +532,10 @@ export function nextStart(
   port: string | number,
   opts: NextDevOptions = {}
 ) {
+  // Set NEXT_TEST_MODE for production tests so getDistDir() returns '.next' not '.next/dev'
+  // This is important when tests mix launchApp() and nextStart() calls
+  process.env.NEXT_TEST_MODE = 'start'
+
   return runNextCommandDev(
     ['start', '-p', port as string, '--hostname', '::', dir],
     undefined,

Analysis

getDistDir() returns wrong path for integration tests with isolated dev build

What fails: In test/lib/next-test-utils.ts, the getDistDir() function returns .next instead of .next/dev when integration tests run with __NEXT_EXPERIMENTAL_ISOLATED_DEV_BUILD=true and call launchApp() to start a dev server.

How to reproduce:

  1. Set export __NEXT_EXPERIMENTAL_ISOLATED_DEV_BUILD=true (as CI does for integration tests)
  2. Run an integration test that uses launchApp() and then calls getDistDir() to read files
  3. Example: test/integration/externals-pages-bundle/test/externals.test.js lines 25 and 41

Result: Tests fail with ENOENT errors when trying to read files. The Next.js dev server creates files in .next/dev/server/pages/index.js but getDistDir() returns .next, causing tests to look in .next/server/pages/index.js (which doesn't exist).

Expected: getDistDir() should return .next/dev to match the server's actual distDir, which is set to .next/dev when PHASE_DEVELOPMENT_SERVER is active with isolatedDevBuild=true (see packages/next/src/server/config.ts:1199-1204).

Root cause: getDistDir() checks global.isNextDev and process.env.NEXT_TEST_MODE to detect dev mode, but integration tests don't set either. E2e tests set global.isNextDev via test/lib/e2e-utils/index.ts, but integration tests use launchApp() which doesn't set any dev mode indicator visible to the test process.

Fix: Modified launchApp() to set process.env.NEXT_TEST_MODE = 'dev' and nextStart() to set process.env.NEXT_TEST_MODE = 'start' so getDistDir() can correctly detect which mode is active.

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Ah, yes, tests that use launchApp are exceptions for NEXT_TEST_MODE

@devjiwonchoi devjiwonchoi changed the base branch from canary to graphite-base/84558 October 6, 2025 13:59
@devjiwonchoi devjiwonchoi force-pushed the jiwon/10-06-ci_enable_experimental.isolateddevbuild_for_test-experimental-integration_ branch from f1fd649 to 1157d5a Compare October 6, 2025 13:59
@devjiwonchoi devjiwonchoi changed the base branch from graphite-base/84558 to jiwon/10-06-add_.next_dev_types_to_cna_templates_tsconfig_include October 6, 2025 13:59
@devjiwonchoi devjiwonchoi force-pushed the jiwon/10-06-ci_enable_experimental.isolateddevbuild_for_test-experimental-integration_ branch from 1157d5a to 71fc0c7 Compare October 6, 2025 14:29
@devjiwonchoi devjiwonchoi marked this pull request as draft October 6, 2025 15:39
@devjiwonchoi devjiwonchoi force-pushed the jiwon/10-06-ci_enable_experimental.isolateddevbuild_for_test-experimental-integration_ branch 2 times, most recently from 1b2f08f to 95a94e2 Compare October 6, 2025 17:30
@devjiwonchoi devjiwonchoi marked this pull request as ready for review October 6, 2025 18:10
devjiwonchoi added a commit that referenced this pull request Oct 6, 2025
Enabling `experimental.isolatedDevBuild` required many changes to the
current workflow, so we will incrementally roll out to the tests.

1. ~~test-experimental-dev
([link](#84099
2. test-dev ([link](#84562))
2. test-prod ([link](#84556))
3. test-integration
([link](#84558))
4. test-unit (here)
5. Enable by default, remove the flag, and update the rest

x-ref: #84043
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devjiwonchoi commented Oct 6, 2025

Merge activity

  • Oct 6, 7:21 PM UTC: A user started a stack merge that includes this pull request via Graphite.
  • Oct 6, 7:24 PM UTC: Graphite rebased this pull request as part of a merge.

@devjiwonchoi devjiwonchoi changed the base branch from jiwon/10-06-add_.next_dev_types_to_cna_templates_tsconfig_include to graphite-base/84558 October 6, 2025 19:22
@devjiwonchoi devjiwonchoi changed the base branch from graphite-base/84558 to canary October 6, 2025 19:22
@devjiwonchoi devjiwonchoi force-pushed the jiwon/10-06-ci_enable_experimental.isolateddevbuild_for_test-experimental-integration_ branch from 95a94e2 to a6b32ad Compare October 6, 2025 19:23
@devjiwonchoi devjiwonchoi merged commit f9ca4b5 into canary Oct 6, 2025
157 of 160 checks passed
@devjiwonchoi devjiwonchoi deleted the jiwon/10-06-ci_enable_experimental.isolateddevbuild_for_test-experimental-integration_ branch October 6, 2025 19:41
devjiwonchoi added a commit that referenced this pull request Oct 8, 2025
### Why?

This PR cleans up the incremental rollout of enabling `isolatedDevBuild`
throughout the CI, as it required many test changes (x-ref:
#84043).

- #84556
- #84558
- #84559
- #84562

This PR enables `experimental.isolatedDevBuild` by default so that users
can run `next dev` and `next build` in the same directory, and they
would not conflict. This occasionally happens when developing with AI
tools, where you have a running dev server, but the Agent runs `next
build`.

### How?

- Removed `__NEXT_EXPERIMENTAL_ISOLATED_DEV_BUILD` flag and its usage
from CI and tests
- Updated tests that were not caught via rollout (e.g., missed out on
test-*-windows)
- Moved `isolatedDevBuild` option out of experimental
- Added Telemetry

Will follow up with docs.
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