test: add config file with no export

e2e/docs/.vuepress/config.ts

@@ -3,6 +3,7 @@ import { viteBundler } from '@vuepress/bundler-vite'
 import { webpackBundler } from '@vuepress/bundler-webpack'
 import { defineUserConfig } from 'vuepress'
 import { path } from 'vuepress/utils'
+import { testPlugin } from './plugins/testPlugin.js'
 import { e2eTheme } from './theme/node/e2eTheme.js'
 
 const E2E_BASE = (process.env.E2E_BASE ?? '/') as '/' | `/${string}/`
@@ -80,4 +81,6 @@ export default defineUserConfig({
       }
     }
   },
+
+  plugins: [testPlugin],
 })

e2e/docs/.vuepress/plugins/clientConfig.js

@@ -0,0 +1 @@
+import './test.css'

e2e/docs/.vuepress/plugins/test.css

@@ -0,0 +1,3 @@
+h1 {
+  font-size: 32px;
+}

e2e/docs/.vuepress/plugins/testPlugin.js

@@ -0,0 +1,8 @@
+import { createRequire } from 'node:module'
+
+const require = createRequire(import.meta.url)
+
+export const testPlugin = {
+  name: 'test-plugin',
+  clientConfigFile: require.resolve('./clientConfig.js'),
+}