web-infra-dev · chenjiahan · Nov 12, 2025 · Nov 6, 2025
diff --git a/.changeset/grumpy-jars-reply.md b/.changeset/grumpy-jars-reply.md
@@ -0,0 +1,5 @@
+---
+'@modern-js/builder': patch
+---
+
+refactor(builder): clean up unused code
diff --git a/packages/cli/builder/src/createBuilder.ts b/packages/cli/builder/src/createBuilder.ts
@@ -113,7 +113,6 @@ export async function parseConfig(
     rsbuildPlugins.push(
       rsbuildRscPlugin({
         appDir: options.cwd,
-        isRspack: true,
         rscClientRuntimePath,
         rscServerRuntimePath,
         internalDirectory,

diff --git a/packages/cli/builder/src/rsc/plugins/rsbuild-rsc-plugin.ts b/packages/cli/builder/src/rsc/plugins/rsbuild-rsc-plugin.ts
@@ -40,13 +40,11 @@ const checkReactVersionAtLeast19 = async (appDir: string) => {
 
 export const rsbuildRscPlugin = ({
   appDir,
-  isRspack = true,
   rscClientRuntimePath,
   rscServerRuntimePath,
   internalDirectory,
 }: {
   appDir: string;
-  isRspack?: boolean;
   rscClientRuntimePath?: string;
   rscServerRuntimePath?: string;
   internalDirectory?: string;

diff --git a/packages/cli/builder/src/rsc/plugins/rspack-rsc-client-plugin.ts b/packages/cli/builder/src/rsc/plugins/rspack-rsc-client-plugin.ts
@@ -81,11 +81,10 @@ export class RspackRscClientPlugin {
 
     const addClientReferencesChunks = (
       compilation: Rspack.Compilation,
-      entryModule: Rspack.Module,
       callback: (err: any | null) => void,
     ) => {
       const promises = [];
-      [...this.clientReferencesMap.keys()].forEach((resourcePath, index) => {
+      [...this.clientReferencesMap.keys()].forEach(resourcePath => {
         const entries = compilation.entries.entries();
 
         for (const [entryName, entry] of entries) {
@@ -159,47 +158,44 @@ export class RspackRscClientPlugin {
 
         for (const entryModule of entryModules) {
           if (entryModule) {
-            addClientReferencesChunks(compilation, entryModule, callback);
+            addClientReferencesChunks(compilation, callback);
           }
         }
       },
     );
 
-    compiler.hooks.compilation.tap(
-      RspackRscClientPlugin.name,
-      (compilation, { normalModuleFactory }) => {
-        class EntryNameRuntimeModule extends RuntimeModule {
-          private entryName: string;
-          constructor(entryName: string) {
-            super('entry-name', 10); // Set a higher stage to ensure priority execution
-            this.entryName = entryName;
-          }
+    compiler.hooks.compilation.tap(RspackRscClientPlugin.name, compilation => {
+      class EntryNameRuntimeModule extends RuntimeModule {
+        private entryName: string;
+        constructor(entryName: string) {
+          super('entry-name', 10); // Set a higher stage to ensure priority execution
+          this.entryName = entryName;
+        }
 
-          generate() {
-            return `window.__MODERN_JS_ENTRY_NAME="${this.entryName}";`;
-          }
+        generate() {
+          return `window.__MODERN_JS_ENTRY_NAME="${this.entryName}";`;
         }
+      }
 
-        compilation.hooks.runtimeRequirementInTree
-          .for(RuntimeGlobals.ensureChunk)
-          .tap(RspackRscClientPlugin.name, (chunk, set) => {
-            Array.from(compilation.entrypoints.entries()).forEach(
-              ([entryName, entrypoint]) => {
-                if (entrypoint.chunks.includes(chunk)) {
-                  compilation.addRuntimeModule(
-                    chunk,
-                    new EntryNameRuntimeModule(entryName),
-                  );
-                }
-              },
-            );
-          });
-      },
-    );
+      compilation.hooks.runtimeRequirementInTree
+        .for(RuntimeGlobals.ensureChunk)
+        .tap(RspackRscClientPlugin.name, chunk => {
+          Array.from(compilation.entrypoints.entries()).forEach(
+            ([entryName, entrypoint]) => {
+              if (entrypoint.chunks.includes(chunk)) {
+                compilation.addRuntimeModule(
+                  chunk,
+                  new EntryNameRuntimeModule(entryName),
+                );
+              }
+            },
+          );
+        });
+    });
 
     compiler.hooks.thisCompilation.tap(
       RspackRscClientPlugin.name,
-      (compilation, { normalModuleFactory }) => {
+      compilation => {
         this.styles = sharedData.get('styles') as Set<string>;
         this.clientReferencesMap = sharedData.get(
           'clientReferencesMap',

diff --git a/packages/cli/builder/src/rsc/plugins/rspack-rsc-server-plugin.ts b/packages/cli/builder/src/rsc/plugins/rspack-rsc-server-plugin.ts
@@ -433,21 +433,18 @@ export class RscServerPlugin {
       }
     });
 
-    compiler.hooks.thisCompilation.tap(
-      RscServerPlugin.name,
-      (compilation, { normalModuleFactory }) => {
-        compilation.hooks.needAdditionalPass.tap(
-          RscServerPlugin.name,
-          () => !(needsAdditionalPass = !needsAdditionalPass),
-        );
+    compiler.hooks.thisCompilation.tap(RscServerPlugin.name, compilation => {
+      compilation.hooks.needAdditionalPass.tap(
+        RscServerPlugin.name,
+        () => !(needsAdditionalPass = !needsAdditionalPass),
+      );
 
-        compilation.hooks.processAssets.tap(RscServerPlugin.name, () => {
-          compilation.emitAsset(
-            this.serverManifestFilename,
-            new RawSource(JSON.stringify(this.serverManifest, null, 2), false),
-          );
-        });
-      },
-    );
+      compilation.hooks.processAssets.tap(RscServerPlugin.name, () => {
+        compilation.emitAsset(
+          this.serverManifestFilename,
+          new RawSource(JSON.stringify(this.serverManifest, null, 2), false),
+        );
+      });
+    });
   }
 }
diff --git a/packages/cli/builder/src/rsc/rsc-ssr-loader.ts b/packages/cli/builder/src/rsc/rsc-ssr-loader.ts
@@ -18,7 +18,6 @@ export default async function rscSsrLoader(
 ) {
   this.cacheable(true);
   const callback = this.async();
-  const { entryPath2Name } = this.getOptions();
   const ast = await parseSource(source);
   const hasDeclareServerDirective = await isServerModule(ast);
   const resourcePath = this.resourcePath;

diff --git a/packages/cli/builder/src/shared/utils.ts b/packages/cli/builder/src/shared/utils.ts
@@ -1,30 +1,12 @@
-import type {
-  NormalizedEnvironmentConfig,
-  RsbuildContext,
-  RsbuildTarget,
-  RspackChain,
-} from '@rsbuild/core';
+import type { NormalizedEnvironmentConfig, RsbuildTarget } from '@rsbuild/core';
 import browserslist from 'browserslist';
 
 export const RUNTIME_CHUNK_NAME = 'builder-runtime';
 
 export const SERVICE_WORKER_ENVIRONMENT_NAME = 'workerSSR';
 
-export const JS_REGEX = /\.(?:js|mjs|cjs|jsx)$/;
-
-export const TS_REGEX = /\.(?:ts|mts|cts|tsx)$/;
-
-export const SCRIPT_REGEX = /\.(?:js|jsx|mjs|cjs|ts|tsx|mts|cts)$/;
-
 export const NODE_MODULES_REGEX = /[\\/]node_modules[\\/]/;
 
-export function isServerEnvironment(
-  target: RsbuildTarget,
-  environment: string,
-) {
-  return target === 'node' || environment === SERVICE_WORKER_ENVIRONMENT_NAME;
-}
-
 export const castArray = <T>(arr?: T | T[]): T[] => {
   if (arr === undefined) {
     return [];
@@ -53,58 +35,6 @@ async function getBrowserslist(path: string): Promise<string[] | null> {
   return null;
 }
 
-export const getUseBuiltIns = (
-  config: NormalizedEnvironmentConfig,
-): false | 'usage' | 'entry' => {
-  const { polyfill } = config.output;
-  if (polyfill === 'off') {
-    return false;
-  }
-  return polyfill;
-};
-
-export function applyScriptCondition({
-  rule,
-  chain,
-  config,
-  context,
-  includes,
-  excludes,
-}: {
-  rule: RspackChain.Rule;
-  chain: RspackChain;
-  config: NormalizedEnvironmentConfig;
-  context: RsbuildContext;
-  includes: (string | RegExp)[];
-  excludes: (string | RegExp)[];
-}): void {
-  // compile all folders in app directory, exclude node_modules
-  // which can be removed next version of rspack
-  rule.include.add({
-    and: [context.rootPath, { not: NODE_MODULES_REGEX }],
-  });
-
-  // Always compile TS and JSX files.
-  // Otherwise, it will lead to compilation errors and incorrect output.
-  rule.include.add(/\.(?:ts|tsx|jsx|mts|cts)$/);
-
-  // The Rsbuild runtime code is es2017 by default,
-  // transform the runtime code if user target < es2017
-  const target = castArray(chain.get('target'));
-  const legacyTarget = ['es5', 'es6', 'es2015', 'es2016'];
-  if (legacyTarget.some(item => target.includes(item))) {
-    rule.include.add(/[\\/]@rsbuild[\\/]core[\\/]dist[\\/]/);
-  }
-
-  for (const condition of [...includes, ...(config.source.include || [])]) {
-    rule.include.add(condition);
-  }
-
-  for (const condition of [...excludes, ...(config.source.exclude || [])]) {
-    rule.exclude.add(condition);
-  }
-}
-
 export const isHtmlDisabled = (
   config: NormalizedEnvironmentConfig,
   target: RsbuildTarget,

diff --git a/packages/cli/builder/src/types.ts b/packages/cli/builder/src/types.ts
@@ -8,9 +8,7 @@ import type {
   HtmlConfig,
   OutputConfig,
   Polyfill,
-  RequestHandler,
   RsbuildConfig,
-  RsbuildPlugin,
   RsbuildPluginAPI,
   RsbuildPlugins,
   RsbuildTarget,

diff --git a/packages/cli/builder/tsconfig.json b/packages/cli/builder/tsconfig.json
@@ -3,7 +3,8 @@
   "compilerOptions": {
     "module": "ES2020",
     "outDir": "./dist",
-    "baseUrl": "./",
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
     "rootDir": "src",
     "moduleResolution": "Bundler"
   },