upgrade webpack version

Author: yashwanth195

build-tests-samples/heft-storybook-v9-react-tutorial-storykit/package.json

@@ -28,7 +28,7 @@
     "style-loader": "~2.0.0",
     "terser-webpack-plugin": "~3.0.8",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0",
+    "webpack": "~5.104.1",
     "storybook": "~9.1.6",
     "@testing-library/dom": "~7.21.4"
   },

build-tests-samples/heft-storybook-v9-react-tutorial/package.json

@@ -40,7 +40,7 @@
     "source-map-loader": "~1.1.3",
     "style-loader": "~2.0.0",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0",
+    "webpack": "~5.104.1",
     "storybook": "~9.1.6",
     "@testing-library/dom": "~7.21.4",
     "@rushstack/module-minifier": "workspace:*",

build-tests-samples/heft-webpack-basic-tutorial/package.json

@@ -31,6 +31,6 @@
     "source-map-loader": "~3.0.1",
     "style-loader": "~3.3.1",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0"
+    "webpack": "~5.104.1"
   }
 }

build-tests/hashed-folder-copy-plugin-webpack5-test/package.json

@@ -18,6 +18,6 @@
     "html-webpack-plugin": "~5.5.0",
     "typescript": "~5.8.2",
     "webpack-bundle-analyzer": "~4.5.0",
-    "webpack": "~5.103.0"
+    "webpack": "~5.104.1"
   }
 }

build-tests/heft-webpack5-everything-test/package.json

@@ -31,6 +31,6 @@
     "source-map-loader": "~3.0.1",
     "tslint": "~5.20.1",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0"
+    "webpack": "~5.104.1"
   }
 }

build-tests/heft-webpack5-everything-test/webpack.config.js

@@ -20,7 +20,7 @@ module.exports = {
       }
     ]
   },
-  target: ['web', 'es2020'],
+  target: ['web', 'es5'],
   resolve: {
     extensions: ['.js', '.json']
   },
@@ -41,7 +41,7 @@ module.exports = {
       new ModuleMinifierPlugin({
         minifier: new WorkerPoolMinifier({
           terserOptions: {
-            ecma: 2020,
+            ecma: 5,
             mangle: true
           },
           verbose: true

build-tests/set-webpack-public-path-plugin-test/package.json

@@ -20,6 +20,6 @@
     "eslint": "~8.57.0",
     "html-webpack-plugin": "~5.5.0",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0"
+    "webpack": "~5.104.1"
   }
 }

build-tests/set-webpack-public-path-plugin-test/webpack.config.js

@@ -8,6 +8,7 @@ const { WorkerPoolMinifier } = require('@rushstack/module-minifier');
 function generateConfiguration(mode, outputFolderName) {
   return {
     mode: mode,
+    target: ['web', 'es5'],
     entry: {
       'test-bundle': `${__dirname}/lib/index.js`
     },
@@ -27,7 +28,11 @@ function generateConfiguration(mode, outputFolderName) {
     optimization: {
       minimizer: [
         new ModuleMinifierPlugin({
-          minifier: new WorkerPoolMinifier(),
+          minifier: new WorkerPoolMinifier({
+            terserOptions: {
+              ecma: 5
+            }
+          }),
           useSourceMap: true
         })
       ]

build-tests/webpack-local-version-test/package.json

@@ -17,6 +17,6 @@
     "eslint": "~9.25.1",
     "html-webpack-plugin": "~5.5.0",
     "typescript": "~5.8.2",
-    "webpack": "~5.103.0"
+    "webpack": "~5.104.1"
   }
 }

common/changes/@microsoft/rush/yverupaka-webpack-upgrade_2026-02-04-22-04.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Upgraded webpack version to 5.104.1",
+      "type": "none"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}