[DevTools] Store Webpack stats when building extensions (#34514)

.github/workflows/devtools_regression_tests.yml

@@ -92,7 +92,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: react-devtools
-          path: build/devtools.tgz
+          path: build/devtools
           if-no-files-found: error
       # Simplifies getting the extension for local testing
       - name: Archive chrome extension

.github/workflows/runtime_build_and_test.yml

@@ -766,6 +766,11 @@ jobs:
           name: react-devtools-${{ matrix.browser }}-extension
           path: build/devtools/${{ matrix.browser }}-extension.zip
           if-no-files-found: error
+      - name: Archive ${{ matrix.browser }} metadata
+        uses: actions/upload-artifact@v4
+        with:
+          name: react-devtools-${{ matrix.browser }}-metadata
+          path: build/devtools/webpack-stats.*.json
 
   merge_devtools_artifacts:
     name: Merge DevTools artifacts
@@ -776,7 +781,7 @@ jobs:
         uses: actions/upload-artifact/merge@v4
         with:
           name: react-devtools
-          pattern: react-devtools-*-extension
+          pattern: react-devtools-*
 
   run_devtools_e2e_tests:
     name: Run DevTools e2e tests

packages/react-devtools-extensions/build.js

@@ -6,7 +6,7 @@ const archiver = require('archiver');
 const {execSync} = require('child_process');
 const {readFileSync, writeFileSync, createWriteStream} = require('fs');
 const {copy, ensureDir, move, remove, pathExistsSync} = require('fs-extra');
-const {join, resolve} = require('path');
+const {join, resolve, basename} = require('path');
 const {getGitCommit} = require('./utils');
 
 // These files are copied along with Webpack-bundled files
@@ -80,8 +80,25 @@ const build = async (tempPath, manifestPath, envExtension = {}) => {
 
   const copiedManifestPath = join(zipPath, 'manifest.json');
 
+  let webpackStatsFilePath = null;
   // Copy unbuilt source files to zip dir to be packaged:
-  await copy(binPath, join(zipPath, 'build'));
+  await copy(binPath, join(zipPath, 'build'), {
+    filter: filePath => {
+      if (basename(filePath).startsWith('webpack-stats.')) {
+        webpackStatsFilePath = filePath;
+        // The ZIP is the actual extension and doesn't need this metadata.
+        return false;
+      }
+      return true;
+    },
+  });
+  if (webpackStatsFilePath !== null) {
+    await copy(
+      webpackStatsFilePath,
+      join(tempPath, basename(webpackStatsFilePath)),
+    );
+    webpackStatsFilePath = join(tempPath, basename(webpackStatsFilePath));
+  }
   await copy(manifestPath, copiedManifestPath);
   await Promise.all(
     STATIC_FILES.map(file => copy(join(__dirname, file), join(zipPath, file))),
@@ -120,9 +137,11 @@ const build = async (tempPath, manifestPath, envExtension = {}) => {
     archive.finalize();
     zipStream.on('close', () => resolvePromise());
   });
+
+  return webpackStatsFilePath;
 };
 
-const postProcess = async (tempPath, destinationPath) => {
+const postProcess = async (tempPath, destinationPath, webpackStatsFilePath) => {
   const unpackedSourcePath = join(tempPath, 'zip');
   const packedSourcePath = join(tempPath, 'ReactDevTools.zip');
   const packedDestPath = join(destinationPath, 'ReactDevTools.zip');
@@ -130,6 +149,14 @@ const postProcess = async (tempPath, destinationPath) => {
 
   await move(unpackedSourcePath, unpackedDestPath); // Copy built files to destination
   await move(packedSourcePath, packedDestPath); // Copy built files to destination
+  if (webpackStatsFilePath !== null) {
+    await move(
+      webpackStatsFilePath,
+      join(destinationPath, basename(webpackStatsFilePath)),
+    );
+  } else {
+    console.log('No webpack-stats.json file was generated.');
+  }
   await remove(tempPath); // Clean up temp directory and files
 };
 
@@ -158,10 +185,14 @@ const main = async buildId => {
     const tempPath = join(__dirname, 'build', buildId);
     await ensureLocalBuild();
     await preProcess(destinationPath, tempPath);
-    await build(tempPath, manifestPath, envExtension);
+    const webpackStatsFilePath = await build(
+      tempPath,
+      manifestPath,
+      envExtension,
+    );
 
     const builtUnpackedPath = join(destinationPath, 'unpacked');
-    await postProcess(tempPath, destinationPath);
+    await postProcess(tempPath, destinationPath, webpackStatsFilePath);
 
     return builtUnpackedPath;
   } catch (error) {

packages/react-devtools-extensions/package.json

@@ -65,6 +65,7 @@
     "webpack": "^5.82.1",
     "webpack-cli": "^5.1.1",
     "webpack-dev-server": "^4.15.0",
+    "webpack-stats-plugin": "^1.1.3",
     "workerize-loader": "^2.0.2"
   },
   "dependencies": {

packages/react-devtools-extensions/webpack.config.js

@@ -6,6 +6,7 @@ const TerserPlugin = require('terser-webpack-plugin');
 const {GITHUB_URL, getVersionString} = require('./utils');
 const {resolveFeatureFlags} = require('react-devtools-shared/buildUtils');
 const SourceMapIgnoreListPlugin = require('react-devtools-shared/SourceMapIgnoreListPlugin');
+const {StatsWriterPlugin} = require('webpack-stats-plugin');
 
 const NODE_ENV = process.env.NODE_ENV;
 if (!NODE_ENV) {
@@ -37,6 +38,21 @@ const IS_INTERNAL_MCP_BUILD = process.env.IS_INTERNAL_MCP_BUILD === 'true';
 
 const featureFlagTarget = process.env.FEATURE_FLAG_TARGET || 'extension-oss';
 
+let statsFileName = `webpack-stats.${featureFlagTarget}.${__DEV__ ? 'development' : 'production'}`;
+if (IS_CHROME) {
+  statsFileName += `.chrome`;
+}
+if (IS_FIREFOX) {
+  statsFileName += `.firefox`;
+}
+if (IS_EDGE) {
+  statsFileName += `.edge`;
+}
+if (IS_INTERNAL_MCP_BUILD) {
+  statsFileName += `.mcp`;
+}
+statsFileName += '.json';
+
 const babelOptions = {
   configFile: resolve(
     __dirname,
@@ -213,6 +229,10 @@ module.exports = {
         );
       },
     },
+    new StatsWriterPlugin({
+      stats: 'verbose',
+      filename: statsFileName,
+    }),
   ],
   module: {
     defaultRules: [

scripts/ci/pack_and_store_devtools_artifacts.sh

@@ -20,13 +20,11 @@ cd ../react-devtools-extensions
 if [[ -n "$1" ]]; then
   yarn build:$1
   mv ./$1/build/ReactDevTools.zip ../../build/devtools/$1-extension.zip
+  mv ./$1/build/webpack-stats.*.json ../../build/devtools/
 else
   yarn build
   for browser in chrome firefox edge; do
     mv ./$browser/build/ReactDevTools.zip ../../build/devtools/$browser-extension.zip
+    mv ./$browser/build/webpack-stats.*.json ../../build/devtools/
   done
 fi
-
-# Compress all DevTools artifacts into a single tarball for easy download
-cd ../../build/devtools
-tar -zcvf ../devtools.tgz .

yarn.lock

@@ -17792,6 +17792,11 @@ webpack-sources@^3.2.0, webpack-sources@^3.2.3:
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-3.2.3.tgz#2d4daab8451fd4b240cc27055ff6a0c2ccea0cde"
   integrity sha512-/DyMEOrDgLKKIG0fmvtz+4dUX/3Ghozwgm6iPp8KRhvn+eQf9+Q7GWxVNMk3+uCPWfdXYC4ExGBckIXdFEfH1w==
 
+webpack-stats-plugin@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/webpack-stats-plugin/-/webpack-stats-plugin-1.1.3.tgz#ebcc36c8b468074ad737882e2043c1ce4b55d928"
+  integrity sha512-yUKYyy+e0iF/w31QdfioRKY+h3jDBRpthexBOWGKda99iu2l/wxYsI/XqdlP5IU58/0KB9CsJZgWNAl+/MPkRw==
+
 webpack@^5.82.1:
   version "5.82.1"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-5.82.1.tgz#8f38c78e53467556e8a89054ebd3ef6e9f67dbab"