[turbopack] Compute transitive side effects and use them to trim imports #86675

lukesandberg · 2025-12-01T03:11:46Z

Use our new side effects analysis to statically analyze modules and integrate this into the remove unused imports (aka Inner Graph Tree Shaking) logic.

If a module and its transitive dependencies have no side effects based on either declarations or static analysis then we can drop all 'ModuleEvaluation' imports. This can enhance tree shaking and bundle optimization.

From a performance perspective this risky since we need to compute transitive side effects prior to trimming edges. That task is just aggregating a bunch of cached turbo tasks but it might still be expensive. On the other hand trimming edges will speed up chunking and code generation as we have less code to process. To see how this shakes out i built vercel-site both ways.

~/projects/front/apps/vercel-site (main *)$ hyperfine -p 'rm -rf .next' -w 2 -r 10  'TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=1 pnpm next build --turbopack --experimental-build-mode=compile' 'TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=0 pnpm next build --turbopack --experimental-build-mode=compile'
Benchmark 1: TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=1 pnpm next build --turbopack --experimental-build-mode=compile
  Time (mean ± σ):     46.122 s ±  1.453 s    [User: 316.651 s, System: 48.030 s]
  Range (min … max):   43.149 s … 48.129 s    10 runs

Benchmark 2: TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=0 pnpm next build --turbopack --experimental-build-mode=compile
  Time (mean ± σ):     45.864 s ±  1.754 s    [User: 321.621 s, System: 48.937 s]
  Range (min … max):   44.629 s … 50.647 s    10 runs

Summary
  TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=0 pnpm next build --turbopack --experimental-build-mode=compile ran
    1.01 ± 0.05 times faster than TURBOBPACK_REMOVE_UNUSED_SIDE_EFFECTS=1 pnpm next build --turbopack --experimental-build-mode=compile

So definitely a performance regression, I am adding a new 'global summary' task in the critical path

But how much does it save?

The number of unused references for vercel-site goes from 2144 to 21925 (!!), but these are mostly just trimming our parallel Evaluation edges, the real idea is number of trimmed modules which goes from 1802 -> 2165 (out of 48783 total) which is a nice if small win. From scanning the names these are mostly icons and date time helper modules.

We do tend to see large wins on benchmarks due to silly patterns they have.

lukesandberg · 2025-12-01T03:12:03Z

This stack of pull requests is managed by Graphite. Learn more about stacking.

ijjk · 2025-12-01T03:19:59Z

Tests Passed

ijjk · 2025-12-01T03:25:32Z

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
buildDuration	17.6s	14.7s	N/A
buildDurationCached	13.8s	10.8s	N/A
nodeModulesSize	457 MB	457 MB	✓
nextStartRea..uration (ms)	712ms	712ms	✓

Client Bundles (main, webpack) Overall increase ⚠️

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
4765.HASH.js gzip	169 B	169 B	✓
6566-HASH.js gzip	5.4 kB	5.38 kB	N/A
7740-HASH.js gzip	53.4 kB	52.8 kB	N/A
8258-HASH.js gzip	4.47 kB	4.48 kB	N/A
b0b1acf2-HASH.js gzip	62.3 kB	62.3 kB	N/A
framework-HASH.js gzip	59.7 kB	59.7 kB	N/A
main-app-HASH.js gzip	255 B	252 B	N/A
main-HASH.js gzip	38.5 kB	38.8 kB	⚠️ +260 B
webpack-HASH.js gzip	1.69 kB	1.69 kB	✓
Overall change	40.4 kB	40.6 kB	⚠️ +260 B

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
_app-HASH.js gzip	193 B	192 B	N/A
_error-HASH.js gzip	181 B	182 B	N/A
css-HASH.js gzip	335 B	336 B	N/A
dynamic-HASH.js gzip	1.81 kB	1.8 kB	N/A
edge-ssr-HASH.js gzip	254 B	256 B	N/A
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	385 B	383 B	N/A
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	259 B	259 B	✓
link-HASH.js gzip	2.5 kB	2.5 kB	N/A
routerDirect..HASH.js gzip	320 B	317 B	N/A
script-HASH.js gzip	386 B	384 B	N/A
withRouter-HASH.js gzip	315 B	314 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	1.29 kB	1.29 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
_buildManifest.js gzip	737 B	735 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
index.html gzip	522 B	522 B	✓
link.html gzip	536 B	537 B	N/A
withRouter.html gzip	518 B	519 B	N/A
Overall change	522 B	522 B	✓

Edge SSR bundle Size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
edge-ssr.js gzip	124 kB	125 kB	⚠️ +384 B
page.js gzip	237 kB	237 kB	⚠️ +490 B
Overall change	361 kB	362 kB	⚠️ +874 B

Middleware size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
middleware-b..fest.js gzip	657 B	657 B	✓
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	32.6 kB	32.9 kB	⚠️ +324 B
edge-runtime..pack.js gzip	846 B	846 B	✓
Overall change	34.1 kB	34.5 kB	⚠️ +324 B

Next Runtimes

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
app-page-exp...dev.js gzip	301 kB	301 kB	✓
app-page-exp..prod.js gzip	156 kB	156 kB	✓
app-page-tur...dev.js gzip	301 kB	301 kB	✓
app-page-tur..prod.js gzip	156 kB	156 kB	✓
app-page-tur...dev.js gzip	298 kB	298 kB	N/A
app-page-tur..prod.js gzip	154 kB	154 kB	✓
app-page.run...dev.js gzip	298 kB	298 kB	N/A
app-page.run..prod.js gzip	154 kB	154 kB	✓
app-route-ex...dev.js gzip	68.6 kB	68.6 kB	✓
app-route-ex..prod.js gzip	47.5 kB	47.5 kB	✓
app-route-tu...dev.js gzip	68.7 kB	68.7 kB	✓
app-route-tu..prod.js gzip	47.5 kB	47.5 kB	✓
app-route-tu...dev.js gzip	68.3 kB	68.3 kB	✓
app-route-tu..prod.js gzip	47.2 kB	47.2 kB	✓
app-route.ru...dev.js gzip	68.2 kB	68.2 kB	✓
app-route.ru..prod.js gzip	47.2 kB	47.2 kB	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	328 B	328 B	✓
dist_client_...dev.js gzip	320 B	320 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
pages-api-tu...dev.js gzip	41 kB	41 kB	✓
pages-api-tu..prod.js gzip	31.1 kB	31.1 kB	✓
pages-api.ru...dev.js gzip	41 kB	41 kB	✓
pages-api.ru..prod.js gzip	31.1 kB	31.1 kB	✓
pages-turbo....dev.js gzip	50.5 kB	50.5 kB	✓
pages-turbo...prod.js gzip	38 kB	38 kB	✓
pages.runtim...dev.js gzip	50.5 kB	50.5 kB	✓
pages.runtim..prod.js gzip	38 kB	38 kB	✓
server.runti..prod.js gzip	59.8 kB	59.8 kB	✓
Overall change	2.07 MB	2.07 MB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js use_side_effect_analysis	Change
0.pack gzip	3.1 MB	3.11 MB	⚠️ +3.61 kB
index.pack gzip	93.6 kB	93.9 kB	⚠️ +302 B
Overall change	3.2 MB	3.2 MB	⚠️ +3.91 kB

Diff details

Diff for page.js

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Diff for middleware.js

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Diff for edge-ssr.js

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Diff for _buildManifest.js

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       __webpack_exports__,
       __webpack_require__
@@ -59,30 +76,13 @@
 
       /***/
     },
-
-    /***/ 8637: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/hooks",
-        function () {
-          return __webpack_require__(1705);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
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   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(8637)
+      __webpack_exec__(1271)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for image-HASH.js

@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [2983],
   {
-    /***/ 798: /***/ (
+    /***/ 565: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/image",
+        function () {
+          return __webpack_require__(7813);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 7813: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -18,8 +35,8 @@
 
       // EXTERNAL MODULE: ./node_modules/.pnpm/react@19.2.2/node_modules/react/jsx-runtime.js
       var jsx_runtime = __webpack_require__(1329);
-      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+main-repo+packages+next+next-packed.tgz_react-dom@19.2.2_react@19.2.2__react@19.2.2/node_modules/next/image.js
-      var next_image = __webpack_require__(8258);
+      // EXTERNAL MODULE: ./node_modules/.pnpm/next@file+..+diff-repo+packages+next+next-packed.tgz_react-dom@19.2.2_react@19.2.2__react@19.2.2/node_modules/next/image.js
+      var next_image = __webpack_require__(6316);
       var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
       /* harmony default export */ const nextjs = {
         src: "/_next/static/media/nextjs.cae0b805.png",
@@ -48,30 +65,13 @@
 
       /***/
     },
-
-    /***/ 7643: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/image",
-        function () {
-          return __webpack_require__(798);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
-    /******/ __webpack_require__.O(0, [8258, 636, 6593, 8792], () =>
-      __webpack_exec__(7643)
+    /******/ __webpack_require__.O(0, [6316, 636, 6593, 8792], () =>
+      __webpack_exec__(565)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for link-HASH.js

@@ -1,43 +1,36 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 4183: /***/ (module, exports, __webpack_require__) => {
+    /***/ 443: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(2457);
+
+      /***/
+    },
+
+    /***/ 2185: /***/ (__unused_webpack_module, exports) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
         value: true,
       });
-      Object.defineProperty(exports, "getDomainLocale", {
+      Object.defineProperty(exports, "errorOnce", {
         enumerable: true,
         get: function () {
-          return getDomainLocale;
+          return errorOnce;
         },
       });
-      const _normalizetrailingslash = __webpack_require__(8887);
-      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
+      let errorOnce = (_) => {};
+      if (false) {
+      } //# sourceMappingURL=error-once.js.map
 
       /***/
     },
 
-    /***/ 5049: /***/ (module, exports, __webpack_require__) => {
+    /***/ 2457: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -64,17 +57,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(7197)
       );
-      const _resolvehref = __webpack_require__(3575);
-      const _islocalurl = __webpack_require__(4135);
-      const _formaturl = __webpack_require__(3050);
-      const _utils = __webpack_require__(6864);
-      const _addlocale = __webpack_require__(1789);
-      const _routercontextsharedruntime = __webpack_require__(1778);
-      const _useintersection = __webpack_require__(7210);
-      const _getdomainlocale = __webpack_require__(4183);
-      const _addbasepath = __webpack_require__(6518);
-      const _usemergedref = __webpack_require__(9011);
-      const _erroronce = __webpack_require__(5193);
+      const _resolvehref = __webpack_require__(5687);
+      const _islocalurl = __webpack_require__(7127);
+      const _formaturl = __webpack_require__(58);
+      const _utils = __webpack_require__(2080);
+      const _addlocale = __webpack_require__(5709);
+      const _routercontextsharedruntime = __webpack_require__(4770);
+      const _useintersection = __webpack_require__(3290);
+      const _getdomainlocale = __webpack_require__(4615);
+      const _addbasepath = __webpack_require__(8422);
+      const _usemergedref = __webpack_require__(9667);
+      const _erroronce = __webpack_require__(2185);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -453,82 +446,7 @@
       /***/
     },
 
-    /***/ 5193: /***/ (__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
-
-      /***/
-    },
-
-    /***/ 5529: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(5049);
-
-      /***/
-    },
-
-    /***/ 6887: /***/ (
-      __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__(1329);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(5529);
-      /* 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;
-
-      /***/
-    },
-
-    /***/ 7210: /***/ (module, exports, __webpack_require__) => {
+    /***/ 3290: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -541,7 +459,7 @@
         },
       });
       const _react = __webpack_require__(7197);
-      const _requestidlecallback = __webpack_require__(1785);
+      const _requestidlecallback = __webpack_require__(6809);
       const hasIntersectionObserver =
         typeof IntersectionObserver === "function";
       const observers = new Map();
@@ -653,7 +571,106 @@
       /***/
     },
 
-    /***/ 9011: /***/ (module, exports, __webpack_require__) => {
+    /***/ 4615: /***/ (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__(903);
+      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
+
+      /***/
+    },
+
+    /***/ 6745: /***/ (
+      __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__(1329);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
+        __webpack_require__(443);
+      /* 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;
+
+      /***/
+    },
+
+    /***/ 7595: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/link",
+        function () {
+          return __webpack_require__(6745);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9667: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -730,30 +747,13 @@
 
       /***/
     },
-
-    /***/ 9297: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/link",
-        function () {
-          return __webpack_require__(6887);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9297)
+      __webpack_exec__(7595)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for routerDirect-HASH.js

@@ -1,34 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [188],
   {
-    /***/ 1576: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(5704);
-
-      /***/
-    },
-
-    /***/ 7881: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/routerDirect",
-        function () {
-          return __webpack_require__(9851);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 9851: /***/ (
+    /***/ 3401: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1329);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(1576);
+        __webpack_require__(6702);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -62,13 +35,40 @@
 
       /***/
     },
+
+    /***/ 4787: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/routerDirect",
+        function () {
+          return __webpack_require__(3401);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 6702: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(728);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(7881)
+      __webpack_exec__(4787)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for script-HASH.js

@@ -1,34 +1,17 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 2777: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(9272);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 8662: /***/ (
+    /***/ 6868: /***/ (
       module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(4550);
+      module.exports = __webpack_require__(1190);
 
       /***/
     },
 
-    /***/ 9272: /***/ (
+    /***/ 7478: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +26,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1329);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8662);
+        __webpack_require__(6868);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -75,13 +58,30 @@
 
       /***/
     },
+
+    /***/ 7659: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(7478);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(2777)
+      __webpack_exec__(7659)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

Diff for withRouter-HASH.js

@@ -1,17 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 1576: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(5704);
-
-      /***/
-    },
-
-    /***/ 8478: /***/ (
+    /***/ 2528: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -26,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(1329);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(1576);
+        __webpack_require__(6702);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -45,7 +35,17 @@
       /***/
     },
 
-    /***/ 9505: /***/ (
+    /***/ 6702: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(728);
+
+      /***/
+    },
+
+    /***/ 9763: /***/ (
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       __unused_webpack_exports,
       __webpack_require__
@@ -53,7 +53,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/withRouter",
         function () {
-          return __webpack_require__(8478);
+          return __webpack_require__(2528);
         },
       ]);
       if (false) {
@@ -67,7 +67,7 @@
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       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9505)
+      __webpack_exec__(9763)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;

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Commit: 35effee

codspeed-hq · 2025-12-01T03:36:35Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing use_side_effect_analysis (255aa68) with canary (25046df)}

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

crates/next-core/src/raw_ecmascript_module.rs

turbopack/crates/turbopack-ecmascript/src/tree_shake/asset.rs

turbopack/crates/turbopack-core/src/module_graph/side_effect_module_info.rs

.../src/next_client_reference/ecmascript_client_reference/ecmascript_client_reference_module.rs

turbopack/crates/turbopack-ecmascript/src/references/external_module.rs

...cution/turbopack/resolving/tsconfig-nodenext/issues/Error evaluating Node.js code-a1070b.txt

turbopack/crates/turbopack-ecmascript/src/tree_shake/side_effect_module.rs

turbopack/crates/turbopack/src/lib.rs

turbopack/crates/turbopack-core/src/module_graph/binding_usage_info.rs

…led in canary builds (#87215) Since we are aiming for a release this week, lets flag this off since it probably won't get enough dogfooding before then. Also this will unblock landing #86675

…ports, so those can be trimmed during graph construction

…iptModule fewer globs constructed, fewer turbotasks executed

nextjs-bot · 2026-01-09T22:45:18Z

Stats from current PR

✅ No significant changes detected

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

Listen = TCP port starts accepting connections
First Request = HTTP server returns successful response
Cold = Fresh build (no cache)
Warm = With cached build artifacts

Build Metrics:

Fresh = Clean build (no .next directory)
Cached = With existing .next directory

Change Thresholds:

Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
Size: Changes < 1KB AND < 1% are insignificant
All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	455ms	✓	██▁█▁
Cold (First Request)	1.110s	1.121s	✓	▁▇███
Warm (Listen)	456ms	457ms	✓	▃▃▆▃▃
Warm (First Request)	335ms	334ms	✓	▆▄▆█▄

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	456ms	✓	▁▁▁██
Cold (First Request)	1.824s	1.812s	✓	▅▄▅▅▄
Warm (Listen)	458ms	457ms	✓	▁▅▅▅▅
Warm (First Request)	1.836s	1.830s	✓	▄▄▅▄▅

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.045s	4.031s	✓	▄▁▁▃▂
Cached Build	4.034s	4.060s	✓	▇▂▁▄▂

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.281s	14.419s	✓	▁▁▃▁▁
Cached Build	14.297s	14.402s	✓	▁▁▃▁▁
node_modules Size	457 MB	457 MB	✓	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **430 kB** → **430 kB** ✅ -26 B

82 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	788 B	792 B	✓
Total	788 B	792 B	⚠️ +4 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	448 B	450 B	✓
Total	448 B	450 B	⚠️ +2 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
2086.HASH.js gzip	169 B	N/A	-
2161-HASH.js gzip	5.41 kB	N/A	-
2747-HASH.js gzip	4.48 kB	N/A	-
4322-HASH.js gzip	52.7 kB	N/A	-
ec793fe8-HASH.js gzip	62.3 kB	N/A	-
framework-HASH.js gzip	59.8 kB	59.8 kB	✓
main-app-HASH.js gzip	251 B	254 B	🔴 +3 B (+1%)
main-HASH.js gzip	38.6 kB	39 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
1596.HASH.js gzip	N/A	169 B	-
2658-HASH.js gzip	N/A	52.5 kB	-
6349-HASH.js gzip	N/A	4.46 kB	-
7019-HASH.js gzip	N/A	5.43 kB	-
b17a3386-HASH.js gzip	N/A	62.3 kB	-
Total	225 kB	225 kB	⚠️ +157 B

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_app-HASH.js gzip	194 B	193 B	✓
_error-HASH.js gzip	182 B	182 B	✓
css-HASH.js gzip	336 B	335 B	✓
dynamic-HASH.js gzip	1.8 kB	1.8 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	352 B	349 B	✓
hooks-HASH.js gzip	385 B	384 B	✓
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	259 B	258 B	✓
link-HASH.js gzip	2.5 kB	2.51 kB	✓
routerDirect..HASH.js gzip	319 B	317 B	✓
script-HASH.js gzip	385 B	387 B	✓
withRouter-HASH.js gzip	316 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.96 kB	✅ -8 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	125 kB	125 kB	✓
page.js gzip	239 kB	239 kB	✓
Total	364 kB	364 kB	⚠️ +256 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	653 B	654 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	32.7 kB	33 kB	🔴 +340 B (+1%)
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.3 kB	34.7 kB	⚠️ +342 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	738 B	738 B	✓
Total	738 B	738 B	✓

Build Cache

	Canary	PR	Change
0.pack gzip	3.6 MB	3.61 MB	🔴 +4.51 kB (+0%)
index.pack gzip	98.9 kB	97.9 kB	✓
index.pack.old gzip	98.2 kB	98.7 kB	✓
Total	3.8 MB	3.8 MB	⚠️ +4.13 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	303 kB	303 kB	✓
app-page-exp..prod.js gzip	157 kB	157 kB	✓
app-page-tur...dev.js gzip	302 kB	302 kB	✓
app-page-tur..prod.js gzip	157 kB	157 kB	✓
app-page-tur...dev.js gzip	299 kB	299 kB	✓
app-page-tur..prod.js gzip	155 kB	155 kB	✓
app-page.run...dev.js gzip	299 kB	299 kB	✓
app-page.run..prod.js gzip	155 kB	155 kB	✓
app-route-ex...dev.js gzip	68.2 kB	68.2 kB	✓
app-route-ex..prod.js gzip	46.9 kB	46.9 kB	✓
app-route-tu...dev.js gzip	68.2 kB	68.2 kB	✓
app-route-tu..prod.js gzip	46.9 kB	46.9 kB	✓
app-route-tu...dev.js gzip	67.8 kB	67.8 kB	✓
app-route-tu..prod.js gzip	46.7 kB	46.7 kB	✓
app-route.ru...dev.js gzip	67.8 kB	67.8 kB	✓
app-route.ru..prod.js gzip	46.7 kB	46.7 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	41.1 kB	41.1 kB	✓
pages-api-tu..prod.js gzip	31.2 kB	31.2 kB	✓
pages-api.ru...dev.js gzip	41.1 kB	41.1 kB	✓
pages-api.ru..prod.js gzip	31.2 kB	31.2 kB	✓
pages-turbo....dev.js gzip	50.8 kB	50.8 kB	✓
pages-turbo...prod.js gzip	38.2 kB	38.2 kB	✓
pages.runtim...dev.js gzip	50.8 kB	50.8 kB	✓
pages.runtim..prod.js gzip	38.2 kB	38.2 kB	✓
server.runti..prod.js gzip	62 kB	62 kB	✓
Total	2.67 MB	2.67 MB	✅ -3 B

This commit adds analysis to remove imports that are only used for side effects when the target module is proven to be side-effect-free. Changes: - Integrate compute_side_effect_free_module_info() into binding_usage_info - Check ExportUsage::Evaluation to detect side-effect-only imports - Only remove imports when: 1. ImportUsage::SideEffects (no export-based tree-shaking) 2. ExportUsage::Evaluation (no exports used, only side effects) 3. Target module is in side_effect_free_modules set - Add debug logging to show which modules are side-effect-free - Fix typo: ModuleEvalutationIsSideEffectFree -> ModuleEvaluationIsSideEffectFree This enables more aggressive tree-shaking by removing unnecessary side-effect imports like 'import "./side-effect-free-module"'.

turbopack/crates/turbopack-core/src/module_graph/binding_usage_info.rs

lukesandberg · 2026-01-09T23:15:15Z

...s/execution/webpack/side-effects/type-reexports/issues/unexpected export __star__-e538b2.txt

@@ -2,9 +2,4 @@ warning - [analysis] /turbopack/crates/turbopack-tests/tests/execution/webpack/s

  export * used with module [project]/turbopack/crates/turbopack-tests/tests/execution/webpack/side-effects/type-reexports/input/empty.js [test] (ecmascript) which has no exports
  Typescript only: Did you want to export only types with `export type * from "..."`?
-  Note: Using `export type` is more efficient than `export *` as it won't emit any runtime code.
-


losing the trace here is kinda funny. we trim both of these modules early enough that they don't end up in the module graph so we cannot trace them lol

bgw

We sat together IRL and discussed this PR. LGTM!

ijjk added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Dec 1, 2025

lukesandberg mentioned this pull request Dec 1, 2025

[turbopack] Mark packages as side effect free when local analysis determines that they are. #86398

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lukesandberg force-pushed the use_side_effect_analysis branch from 1fc4fb8 to f544707 Compare December 1, 2025 21:42

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crates/next-core/src/raw_ecmascript_module.rs Outdated Show resolved Hide resolved

lukesandberg force-pushed the use_side_effect_analysis branch from f544707 to 102d370 Compare December 3, 2025 01:08

lukesandberg force-pushed the simple_side_effect_free_analysis branch from f281a83 to f6e85cd Compare December 3, 2025 01:08

lukesandberg changed the title ~~Rename side_effects and implement it everywhere~~ [turbopack] Compute transitive side effects and use them to trim imports Dec 3, 2025

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turbopack/crates/turbopack-ecmascript/src/tree_shake/asset.rs Show resolved Hide resolved

lukesandberg force-pushed the simple_side_effect_free_analysis branch from f6e85cd to ec765fe Compare December 3, 2025 02:40

lukesandberg force-pushed the use_side_effect_analysis branch from 102d370 to 2f350c2 Compare December 3, 2025 02:40

lukesandberg mentioned this pull request Dec 3, 2025

[turbopack] Avoid returning multiple requests when performing file extension substitution #86520

Merged

lukesandberg force-pushed the use_side_effect_analysis branch from 2f350c2 to 739fa8b Compare December 3, 2025 03:22