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Merged
merged 1 commit into from
Apr 10, 2025
Merged

Move unhandled rejection handling to shared path #77997

merged 1 commit into from
Apr 10, 2025
+99 −17

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acdlite
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@acdlite acdlite commented Apr 10, 2025

The conventional wisdom of Node.js and other runtimes is to treat unhandled errors as fatal and exit the process.

But Next.js is not a generic JS runtime — it's a specialized runtime for React Server Components.

Many unhandled rejections are due to the late-awaiting pattern for prefetching data. In Next.js it's OK to call an async function without immediately awaiting it, to start the request as soon as possible without blocking unncessarily on the result. These can end up triggering an "unhandledRejection" if it later turns out that the data is not needed to render the page. Example:

const promise = fetchData()
const shouldShow = await checkCondition()
if (shouldShow) {
  return <Component promise={promise} />
}

In this example, fetchData is called immediately to start the request as soon as possible, but if shouldShow is false, then it will be discarded without unwrapping its result. If it errors, it will trigger an "unhandledRejection" event.

Ideally, we would suppress these rejections completely without warning, because we don't consider them real errors. But regardless of whether we do or don't warn, we definitely shouldn't crash the entire process.

Even a "legit" unhandled error unrelated to prefetching shouldn't prevent the rest of the page from rendering.

So, we intentionally override the default error handling behavior of the outer JS runtime to be more forgiving.

This was already the behavior of Next.js for self-hosted deployments — i.e. next start — but the rejection listeners were being installed in a code path that does not run for other deployment targets, like Vercel.

So what this PR does is move the rejection handling code to a path that's common to all deployement targets.

One possibly controversial aspect that is new to this PR is that it removes all existing "unhandledRejection" handlers, before Next.js installs its own. This is to override any handlers that exit the process. Generally we think this is fine because it's unlikely that Next.js will be deployed in such a way that it's sharing a process with non-Next.js applications; however, if we get feedback to the contrary, we'll figure out a strategy to deal with it.

@ijjk ijjk added created-by: Next.js team PRs by the Next.js team. type: next labels Apr 10, 2025
@acdlite acdlite force-pushed the move-unhandled-rejection-handling branch from 80ae5f3 to 4f8c4a2 Compare April 10, 2025 02:50
@ijjk
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ijjk commented Apr 10, 2025 •
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Default Build (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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nextStartRea..uration (ms) 502ms 528ms N/A
Client Bundles (main, webpack) Overall increase ⚠️
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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Overall change 39.4 kB 39.4 kB ✓
Client Pages
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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Client Build Manifests
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Overall change 0 B 0 B ✓
Rendered Page Sizes
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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Overall change 0 B 0 B ✓
Edge SSR bundle Size
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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Overall change 0 B 0 B ✓
Middleware size
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Next Runtimes Overall increase ⚠️
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build cache Overall increase ⚠️
vercel/next.js canary vercel/next.js move-unhandled-rejection-handling Change
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+        // 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
+
+      /***/
+    },
+
+    /***/ 3353: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5526);
+
+      /***/
+    },
+
+    /***/ 3594: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      // ESM COMPAT FLAG
+      __webpack_require__.r(__webpack_exports__);
+
+      // EXPORTS
+      __webpack_require__.d(__webpack_exports__, {
+        __N_SSP: () => /* binding */ __N_SSP,
+        default: () => /* binding */ pages_image,
+      });
+
+      // EXTERNAL MODULE: ./node_modules/.pnpm/react@19.1.0/node_modules/react/jsx-runtime.js
+      var jsx_runtime = __webpack_require__(5640);
+      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+diff-repo+packages+next+next-packed.tgz_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/image.js
+      var next_image = __webpack_require__(3353);
+      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
+      /* harmony default export */ const nextjs = {
+        src: "/_next/static/media/nextjs.cae0b805.png",
+        height: 1347,
+        width: 1626,
+        blurDataURL:
+          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
+        blurWidth: 8,
+        blurHeight: 7,
+      }; // ./pages/image.js
+      function ImagePage(props) {
+        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
+          children: [
+            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
+              children: "next/image example",
+            }),
+            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
+              src: nextjs,
+              placeholder: "blur",
+            }),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const pages_image = ImagePage;
+
+      /***/
+    },
+
+    /***/ 3854: /***/ (
       __unused_webpack_module,
       exports,
       __webpack_require__
@@ -34,9 +217,9 @@
           return getImgProps;
         },
       });
-      const _warnonce = __webpack_require__(5127);
-      const _imageblursvg = __webpack_require__(4287);
-      const _imageconfig = __webpack_require__(2795);
+      const _warnonce = __webpack_require__(3603);
+      const _imageblursvg = __webpack_require__(7835);
+      const _imageconfig = __webpack_require__(6799);
       const VALID_LOADING_VALUES =
         /* unused pure expression or super */ null && [
           "lazy",
@@ -463,55 +646,69 @@
       /***/
     },
 
-    /***/ 3444: /***/ (
+    /***/ 5526: /***/ (
       __unused_webpack_module,
-      __webpack_exports__,
+      exports,
       __webpack_require__
     ) => {
       "use strict";
-      // ESM COMPAT FLAG
-      __webpack_require__.r(__webpack_exports__);
 
-      // EXPORTS
-      __webpack_require__.d(__webpack_exports__, {
-        __N_SSP: () => /* binding */ __N_SSP,
-        default: () => /* binding */ pages_image,
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
       });
-
-      // EXTERNAL MODULE: ./node_modules/.pnpm/react@19.1.0/node_modules/react/jsx-runtime.js
-      var jsx_runtime = __webpack_require__(5640);
-      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+main-repo+packages+next+next-packed.tgz_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/next/image.js
-      var next_image = __webpack_require__(6359);
-      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
-      /* harmony default export */ const nextjs = {
-        src: "/_next/static/media/nextjs.cae0b805.png",
-        height: 1347,
-        width: 1626,
-        blurDataURL:
-          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
-        blurWidth: 8,
-        blurHeight: 7,
-      }; // ./pages/image.js
-      function ImagePage(props) {
-        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
-          children: [
-            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
-              children: "next/image example",
-            }),
-            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
-              src: nextjs,
-              placeholder: "blur",
-            }),
-          ],
+      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;
+        },
+        getImageProps: function () {
+          return getImageProps;
+        },
+      });
+      const _interop_require_default = __webpack_require__(1532);
+      const _getimgprops = __webpack_require__(3854);
+      const _imagecomponent = __webpack_require__(8350);
+      const _imageloader = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(1206)
+      );
+      function getImageProps(imgProps) {
+        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
+          defaultLoader: _imageloader.default,
+          // This is replaced by webpack define plugin
+          imgConf: {
+            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
+            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
+            path: "/_next/image",
+            loader: "default",
+            dangerouslyAllowSVG: false,
+            unoptimized: false,
+          },
         });
+        // Normally we don't care about undefined props because we pass to JSX,
+        // but this exported function could be used by the end user for anything
+        // so we delete undefined props to clean it up a little.
+        for (const [key, value] of Object.entries(props)) {
+          if (value === undefined) {
+            delete props[key];
+          }
+        }
+        return {
+          props,
+        };
       }
-      var __N_SSP = true;
-      /* harmony default export */ const pages_image = ImagePage;
+      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
 
       /***/
     },
 
-    /***/ 4287: /***/ (__unused_webpack_module, exports) => {
+    /***/ 7835: /***/ (__unused_webpack_module, exports) => {
       "use strict";
       /**
        * A shared function, used on both client and server, to generate a SVG blur placeholder.
@@ -566,85 +763,7 @@
       /***/
     },
 
-    /***/ 4985: /***/ (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__(148);
-      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 (e.g. 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
-
-      /***/
-    },
-
-    /***/ 5898: /***/ (module, exports, __webpack_require__) => {
+    /***/ 8350: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -666,17 +785,17 @@
         __webpack_require__(7897)
       );
       const _head = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5207)
+        __webpack_require__(8843)
       );
-      const _getimgprops = __webpack_require__(2514);
-      const _imageconfig = __webpack_require__(2795);
-      const _imageconfigcontextsharedruntime = __webpack_require__(2349);
-      const _warnonce = __webpack_require__(5127);
-      const _routercontextsharedruntime = __webpack_require__(3556);
+      const _getimgprops = __webpack_require__(3854);
+      const _imageconfig = __webpack_require__(6799);
+      const _imageconfigcontextsharedruntime = __webpack_require__(3905);
+      const _warnonce = __webpack_require__(3603);
+      const _routercontextsharedruntime = __webpack_require__(6712);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
+        __webpack_require__(1206)
       );
-      const _usemergedref = __webpack_require__(4985);
+      const _usemergedref = __webpack_require__(1765);
       // This is replaced by webpack define plugin
       const configEnv = {
         deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
@@ -1002,132 +1121,13 @@
 
       /***/
     },
-
-    /***/ 5970: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      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
-
-      /***/
-    },
-
-    /***/ 6359: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(8986);
-
-      /***/
-    },
-
-    /***/ 8986: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      "use strict";
-
-      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;
-        },
-        getImageProps: function () {
-          return getImageProps;
-        },
-      });
-      const _interop_require_default = __webpack_require__(1532);
-      const _getimgprops = __webpack_require__(2514);
-      const _imagecomponent = __webpack_require__(5898);
-      const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
-      );
-      function getImageProps(imgProps) {
-        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
-          defaultLoader: _imageloader.default,
-          // This is replaced by webpack define plugin
-          imgConf: {
-            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
-            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
-            path: "/_next/image",
-            loader: "default",
-            dangerouslyAllowSVG: false,
-            unoptimized: false,
-          },
-        });
-        // Normally we don't care about undefined props because we pass to JSX,
-        // but this exported function could be used by the end user for anything
-        // so we delete undefined props to clean it up a little.
-        for (const [key, value] of Object.entries(props)) {
-          if (value === undefined) {
-            delete props[key];
-          }
-        }
-        return {
-          props,
-        };
-      }
-      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(2198)
+      __webpack_exec__(264)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for index-HASH.js 
@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3332],
   {
-    /***/ 9418: /***/ (
+    /***/ 8230: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/",
+        function () {
+          return __webpack_require__(8696);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 8696: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -19,30 +36,13 @@
 
       /***/
     },
-
-    /***/ 9532: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/",
-        function () {
-          return __webpack_require__(9418);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9532)
+      __webpack_exec__(8230)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for link-HASH.js 
@@ -1,125 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 1854: /***/ (
-      __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__(5640);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8770);
-      /* 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;
-
-      /***/
-    },
-
-    /***/ 3199: /***/ (__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
-
-      /***/
-    },
-
-    /***/ 3568: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/link",
-        function () {
-          return __webpack_require__(1854);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 3857: /***/ (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__(4869);
-      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
-
-      /***/
-    },
-
-    /***/ 3947: /***/ (module, exports, __webpack_require__) => {
+    /***/ 591: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -146,17 +28,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(148)
       );
-      const _resolvehref = __webpack_require__(3161);
-      const _islocalurl = __webpack_require__(2309);
-      const _formaturl = __webpack_require__(3768);
-      const _utils = __webpack_require__(5554);
-      const _addlocale = __webpack_require__(7591);
-      const _routercontextsharedruntime = __webpack_require__(3556);
-      const _useintersection = __webpack_require__(5624);
-      const _getdomainlocale = __webpack_require__(3857);
-      const _addbasepath = __webpack_require__(4356);
-      const _usemergedref = __webpack_require__(4985);
-      const _erroronce = __webpack_require__(3199);
+      const _resolvehref = __webpack_require__(5837);
+      const _islocalurl = __webpack_require__(5953);
+      const _formaturl = __webpack_require__(6212);
+      const _utils = __webpack_require__(6950);
+      const _addlocale = __webpack_require__(6467);
+      const _routercontextsharedruntime = __webpack_require__(6712);
+      const _useintersection = __webpack_require__(9692);
+      const _getdomainlocale = __webpack_require__(6850);
+      const _addbasepath = __webpack_require__(4928);
+      const _usemergedref = __webpack_require__(1765);
+      const _erroronce = __webpack_require__(8659);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -545,7 +427,17 @@
       /***/
     },
 
-    /***/ 4985: /***/ (module, exports, __webpack_require__) => {
+    /***/ 1148: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(591);
+
+      /***/
+    },
+
+    /***/ 1765: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -623,7 +515,125 @@
       /***/
     },
 
-    /***/ 5624: /***/ (module, exports, __webpack_require__) => {
+    /***/ 5436: /***/ (
+      __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__(5640);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
+        __webpack_require__(1148);
+      /* 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;
+
+      /***/
+    },
+
+    /***/ 6850: /***/ (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__(6457);
+      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
+
+      /***/
+    },
+
+    /***/ 8659: /***/ (__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
+
+      /***/
+    },
+
+    /***/ 9666: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/link",
+        function () {
+          return __webpack_require__(5436);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9692: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -636,7 +646,7 @@
         },
       });
       const _react = __webpack_require__(148);
-      const _requestidlecallback = __webpack_require__(3543);
+      const _requestidlecallback = __webpack_require__(315);
       const hasIntersectionObserver =
         typeof IntersectionObserver === "function";
       const observers = new Map();
@@ -748,23 +758,13 @@
 
       /***/
     },
-
-    /***/ 8770: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(3947);
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(3568)
+      __webpack_exec__(9666)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for routerDirect-HASH.js 
@@ -1,7 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [188],
   {
-    /***/ 3618: /***/ (
+    /***/ 76: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -36,17 +36,7 @@
       /***/
     },
 
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 7824: /***/ (
+    /***/ 1810: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -54,7 +44,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/routerDirect",
         function () {
-          return __webpack_require__(3618);
+          return __webpack_require__(76);
         },
       ]);
       if (false) {
@@ -62,13 +52,23 @@
 
       /***/
     },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(7824)
+      __webpack_exec__(1810)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for script-HASH.js 
@@ -1,24 +1,17 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 1984: /***/ (
-      __unused_webpack_module,
+    /***/ 2227: /***/ (
+      module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(5769);
-        },
-      ]);
-      if (false) {
-      }
+      module.exports = __webpack_require__(5984);
 
       /***/
     },
 
-    /***/ 5769: /***/ (
+    /***/ 3043: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -33,7 +26,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8293);
+        __webpack_require__(2227);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -66,12 +59,19 @@
       /***/
     },
 
-    /***/ 8293: /***/ (
-      module,
+    /***/ 3642: /***/ (
+      __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(900);
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(3043);
+        },
+      ]);
+      if (false) {
+      }
 
       /***/
     },
@@ -81,7 +81,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(1984)
+      __webpack_exec__(3642)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for withRouter-HASH.js 
@@ -1,34 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 9216: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/withRouter",
-        function () {
-          return __webpack_require__(9803);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 9803: /***/ (
+    /***/ 1089: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -61,13 +34,40 @@
 
       /***/
     },
+
+    /***/ 3962: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/withRouter",
+        function () {
+          return __webpack_require__(1089);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9216)
+      __webpack_exec__(3962)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
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Diff for 4719-HASH.js

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Diff for main-HASH.js

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Diff for main-app-HASH.js 
@@ -1,61 +1,61 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4977],
   {
-    /***/ 985: /***/ (
+    /***/ 3579: /***/ () => {
+      /* (ignored) */
+      /***/
+    },
+
+    /***/ 6883: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 8790, 23)
+        __webpack_require__.t.bind(__webpack_require__, 5356, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 7382, 23)
+        __webpack_require__.t.bind(__webpack_require__, 4304, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 9442, 23)
+        __webpack_require__.t.bind(__webpack_require__, 3152, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 94, 23)
+        __webpack_require__.t.bind(__webpack_require__, 9464, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 2439, 23)
+        __webpack_require__.t.bind(__webpack_require__, 7601, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5083, 23)
+        __webpack_require__.t.bind(__webpack_require__, 2553, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 8103, 23)
+        __webpack_require__.t.bind(__webpack_require__, 1925, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5625, 23)
+        __webpack_require__.t.bind(__webpack_require__, 959, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 4247, 23)
+        __webpack_require__.t.bind(__webpack_require__, 9389, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 5602, 23)
+        __webpack_require__.t.bind(__webpack_require__, 8628, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 227, 23)
+        __webpack_require__.t.bind(__webpack_require__, 3077, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 6734, 23)
+        __webpack_require__.t.bind(__webpack_require__, 7812, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.t.bind(__webpack_require__, 4120, 23)
+        __webpack_require__.t.bind(__webpack_require__, 5774, 23)
       );
       Promise.resolve(/* import() eager */).then(
-        __webpack_require__.bind(__webpack_require__, 6104)
+        __webpack_require__.bind(__webpack_require__, 750)
       );
 
       /***/
     },
-
-    /***/ 3505: /***/ () => {
-      /* (ignored) */
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
@@ -63,8 +63,8 @@
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(
       0,
-      [1305, 1733],
-      () => (__webpack_exec__(9679), __webpack_exec__(985))
+      [9910, 965],
+      () => (__webpack_exec__(1389), __webpack_exec__(6883))
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for server.runtime.prod.js

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Commit: bb20468

@ijjk
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ijjk commented Apr 10, 2025 •
edited
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Tests Passed

@acdlite acdlite marked this pull request as ready for review April 10, 2025 03:13
@acdlite acdlite requested review from gnoff and ijjk April 10, 2025 03:13
@eps1lon
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eps1lon commented Apr 10, 2025

One possibly controversial aspect that is new to this PR is that it removes all existing "unhandledRejection" handlers

Does this interfere with 3rd party error o11y tools like Sentry? I think they don't listen to console.error by default so this may result in errors being missed until they start listening to console.error by default.

@acdlite
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acdlite commented Apr 10, 2025 •
edited
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@eps1lon #77997 (comment)

Does this interfere with 3rd party error o11y tools like Sentry?

Yeah it might. I think what I'll do is wrap this in a feature flag for now so we can test it out on Vercel, and meanwhile we'll reach out to Sentry et al to figure out if/how to get some version of this to stable.

@acdlite
Move unhandled rejection handling to shared path
bb20468 
The conventional wisdom of Node.js and other runtimes is to treat
unhandled errors as fatal and exit the process.

But Next.js is not a generic JS runtime — it's a specialized runtime
for React Server Components.

Many unhandled rejections are due to the late-awaiting pattern for
prefetching data. In Next.js it's OK to call an async function without
immediately awaiting it, to start the request as soon as possible
without blocking unncessarily on the result. These can end up triggering
an "unhandledRejection" if it later turns out that the data is not
needed to render the page. Example:

```js
const promise = fetchData()
const shouldShow = await checkCondition()
if (shouldShow) {
  return <Component promise={promise} />
}
```

In this example, `fetchData` is called immediately to start the request
as soon as possible, but if `shouldShow` is false, then it will be
discarded without unwrapping its result. If it errors, it will trigger
an "unhandledRejection" event.

Ideally, we would suppress these rejections completely without warning,
because we don't consider them real errors. But regardless of whether we
do or don't warn, we definitely shouldn't crash the entire process.

Even a "legit" unhandled error unrelated to prefetching shouldn't
prevent the rest of the page from rendering.

So, we intentionally override the default error handling behavior of
the outer JS runtime to be more forgiving.

---

This was already the behavior of Next.js for self-hosted deployments
— i.e. `next start` — but the rejection listeners were being installed
in a code path that does not run for other deployment targets,
like Vercel.

So what this PR does is move the rejection handling code to a path
that's common to all deployement targets.

One possibly controversial aspect that is new to this PR is that it
removes all existing "unhandledRejection" handlers, before Next.js
installs its own. This is to override any handlers that exit the
process. Generally we think this is fine because it's unlikely that
Next.js will be deployed in such a way that it's sharing a process with
non-Next.js applications; however, if we get feedback to the contrary,
we'll figure out a strategy to deal with it.
@acdlite acdlite force-pushed the move-unhandled-rejection-handling branch from 4f8c4a2 to bb20468 Compare April 10, 2025 17:59
@acdlite acdlite merged commit 0b17ac3 into canary Apr 10, 2025
233 of 239 checks passed
@acdlite acdlite deleted the move-unhandled-rejection-handling branch April 10, 2025 20:31
acdlite added a commit to acdlite/next.js that referenced this pull request Apr 10, 2025
@acdlite
Uninstall uncaughtException listeners, too
e366500 
This broadens the scope of the `removeUnhandledRejectionListeners`
flag to also remove `uncaughtException` listeners.

The motivation is the same: uncaught exceptions in one part of the
page should not prevent the rest of the page from rendering.

See vercel#77997 for more context.

I renamed the experimental flag to `removeUncaughtErrorAndRejectionListeners`
to better reflect increased scope but the name isn't really that
important since at this stage we just need to try out the behavior; it
isn't documented anywhere.
@acdlite acdlite mentioned this pull request Apr 10, 2025
Merged
acdlite added a commit that referenced this pull request Apr 10, 2025
@acdlite
Uninstall existing uncaughtException listeners to prevent the process…
9cac73c 
… from crashing (#78042)

This broadens the scope of the `removeUnhandledRejectionListeners` flag
to also remove `uncaughtException` listeners.

The motivation is the same: uncaught exceptions in one part of the page
should not prevent the rest of the page from rendering.

See #77997 for more context.

I renamed the experimental flag to
`removeUncaughtErrorAndRejectionListeners` to better reflect increased
scope but the name isn't really that important since at this stage we
just need to try out the behavior; it isn't documented anywhere.
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@acdlite @ijjk @eps1lon @gnoff