feat(core): enable Rspack parallelCodeSplitting (#11067)

re-enable parallelCodeSplitting

packages/docusaurus/src/webpack/base.ts

@@ -187,10 +187,6 @@ export async function createBaseConfig({
         // @ts-expect-error: Rspack-only, not available in Webpack typedefs
         incremental: !isProd && !process.env.DISABLE_RSPACK_INCREMENTAL,
 
-        // TODO re-enable later?
-        //  See Rspack 1.3 bug https://github.com/web-infra-dev/rspack/issues/9834
-        parallelCodeSplitting: false,
-
         ...PersistentCacheAttributes,
       };
     }
@@ -253,7 +249,8 @@ export async function createBaseConfig({
       modules: ['node_modules', path.join(siteDir, 'node_modules')],
     },
     optimization: {
-      removeAvailableModules: false,
+      // See https://github.com/web-infra-dev/rspack/issues/9834
+      removeAvailableModules: true,
       // Only minimize client bundle in production because server bundle is only
       // used for static site generation
       minimize: minimizeEnabled,