diff --git a/packages/plugin-rsc/CONTRIBUTING.md b/packages/plugin-rsc/CONTRIBUTING.md
index 74f5bdf1a..7de848fb2 100644
--- a/packages/plugin-rsc/CONTRIBUTING.md
+++ b/packages/plugin-rsc/CONTRIBUTING.md
@@ -36,6 +36,9 @@ Best for testing specific edge cases or isolated features. See `e2e/ssr-thenable
 # Build packages
 pnpm dev # pnpm -C packages/plugin-rsc dev
 
+# Type check
+pnpm -C packages/plugin-rsc tsc-dev
+
 # Run examples
 pnpm -C packages/plugin-rsc/examples/basic dev # build / preview
 pnpm -C packages/plugin-rsc/examples/starter dev # build / preview
diff --git a/packages/plugin-rsc/e2e/fixture.ts b/packages/plugin-rsc/e2e/fixture.ts
index ac1d7385d..f5b883246 100644
--- a/packages/plugin-rsc/e2e/fixture.ts
+++ b/packages/plugin-rsc/e2e/fixture.ts
@@ -200,7 +200,7 @@ function editFileJson(filepath: string, edit: (s: string) => string) {
 export async function setupInlineFixture(options: {
   src: string
   dest: string
-  files?: Record<string, string>
+  files?: Record<string, string | { cp: string }>
 }) {
   fs.rmSync(options.dest, { recursive: true, force: true })
   fs.mkdirSync(options.dest, { recursive: true })
@@ -214,16 +214,24 @@ export async function setupInlineFixture(options: {
   // write additional files
   if (options.files) {
     for (let [filename, contents] of Object.entries(options.files)) {
-      let filepath = path.join(options.dest, filename)
-      fs.mkdirSync(path.dirname(filepath), { recursive: true })
-      // strip indent
+      const destFile = path.join(options.dest, filename)
+      fs.mkdirSync(path.dirname(destFile), { recursive: true })
+
+      // custom command
+      if (typeof contents === 'object' && 'cp' in contents) {
+        const srcFile = path.join(options.dest, contents.cp)
+        fs.copyFileSync(srcFile, destFile)
+        continue
+      }
+
+      // write a new file
       contents = contents.replace(/^\n*/, '').replace(/\s*$/, '\n')
       const indent = contents.match(/^\s*/)?.[0] ?? ''
       const strippedContents = contents
         .split('\n')
         .map((line) => line.replace(new RegExp(`^${indent}`), ''))
         .join('\n')
-      fs.writeFileSync(filepath, strippedContents)
+      fs.writeFileSync(destFile, strippedContents)
     }
   }
 }
diff --git a/packages/plugin-rsc/e2e/starter.test.ts b/packages/plugin-rsc/e2e/starter.test.ts
index 86752aa64..6d80bc986 100644
--- a/packages/plugin-rsc/e2e/starter.test.ts
+++ b/packages/plugin-rsc/e2e/starter.test.ts
@@ -92,12 +92,16 @@ test.describe(() => {
       src: 'examples/starter',
       dest: root,
       files: {
+        'vite.config.base.ts': { cp: 'vite.config.ts' },
         'vite.config.ts': /* js */ `
           import rsc from '@vitejs/plugin-rsc'
           import react from '@vitejs/plugin-react'
-          import { defineConfig } from 'vite'
+          import { defineConfig, mergeConfig } from 'vite'
+          import baseConfig from './vite.config.base.ts'
+          
+          delete baseConfig.plugins
 
-          export default defineConfig({
+          const overrideConfig = defineConfig({
             plugins: [
               react({
                 babel: { plugins: ['babel-plugin-react-compiler'] },
@@ -105,15 +109,11 @@ test.describe(() => {
                 ...p,
                 applyToEnvironment: (e) => e.name === 'client',
               })),
-              rsc({
-                entries: {
-                  client: './src/framework/entry.browser.tsx',
-                  ssr: './src/framework/entry.ssr.tsx',
-                  rsc: './src/framework/entry.rsc.tsx',
-                }
-              }),
+              rsc(),
             ],
           })
+
+          export default mergeConfig(baseConfig, overrideConfig)
         `,
       },
     })
@@ -145,24 +145,16 @@ test.describe(() => {
       src: 'examples/starter',
       dest: root,
       files: {
+        'vite.config.base.ts': { cp: 'vite.config.ts' },
         'vite.config.ts': /* js */ `
-          import rsc from '@vitejs/plugin-rsc'
-          import react from '@vitejs/plugin-react'
-          import { defineConfig } from 'vite'
+          import { defineConfig, mergeConfig } from 'vite'
+          import baseConfig from './vite.config.base.ts'
 
-          export default defineConfig({
+          const overrideConfig = defineConfig({
             base: '/custom-base/',
-            plugins: [
-              react(),
-              rsc({
-                entries: {
-                  client: './src/framework/entry.browser.tsx',
-                  ssr: './src/framework/entry.ssr.tsx',
-                  rsc: './src/framework/entry.rsc.tsx',
-                }
-              }),
-            ],
           })
+
+          export default mergeConfig(baseConfig, overrideConfig)
         `,
       },
     })
@@ -193,22 +185,12 @@ test.describe(() => {
       src: 'examples/starter',
       dest: root,
       files: {
+        'vite.config.base.ts': { cp: 'vite.config.ts' },
         'vite.config.ts': /* js */ `
-          import rsc from '@vitejs/plugin-rsc'
-          import react from '@vitejs/plugin-react'
-          import { defineConfig, createRunnableDevEnvironment } from 'vite'
+          import { defineConfig, mergeConfig, createRunnableDevEnvironment } from 'vite'
+          import baseConfig from './vite.config.base.ts'
 
-          export default defineConfig({
-            plugins: [
-              react(),
-              rsc({
-                entries: {
-                  client: './src/framework/entry.browser.tsx',
-                  ssr: './src/framework/entry.ssr.tsx',
-                  rsc: './src/framework/entry.rsc.tsx',
-                }
-              }),
-            ],
+          const overrideConfig = defineConfig({
             environments: {
               ssr: {
                 dev: {
@@ -234,6 +216,8 @@ test.describe(() => {
               },
             },
           })
+
+          export default mergeConfig(baseConfig, overrideConfig)
         `,
       },
     })