fix: add newline after cjsInterop

closes #1022

src/plugins/cjs-interop.ts

@@ -18,7 +18,7 @@ export const cjsInterop = (): Plugin => {
       }
 
       return {
-        code: code + '\nmodule.exports = exports.default',
+        code: code + '\nmodule.exports = exports.default;\n',
         map: info.map,
       }
     },

vitest.config.ts

@@ -1,9 +1,7 @@
-import { UserConfig } from 'vitest'
+import { defineConfig } from 'vitest/config'
 
-const config: { test: UserConfig } = {
+export default defineConfig({
   test: {
     testTimeout: 50000,
   },
-}
-
-export default config
+})