fix(react-email): next import breaking when done a second time (#2360)

Author: gabrielmfern

.changeset/every-masks-create.md

@@ -0,0 +1,5 @@
+---
+"react-email": patch
+---
+
+dev server erroring when trying to startup with port already being used

packages/react-email/src/utils/preview/start-dev-server.ts

@@ -43,9 +43,6 @@ export const startDevServer = async (
   const previewServerLocation = await getPreviewServerLocation();
   const previewServer = createJiti(previewServerLocation);
 
-  const { default: next } =
-    await previewServer.import<typeof import('next')>('next');
-
   devServer = http.createServer((req, res) => {
     if (!req.url) {
       res.end(404);
@@ -137,6 +134,13 @@ export const startDevServer = async (
     ),
   };
 
+  const next = await previewServer.import<typeof import('next')['default']>(
+    'next',
+    {
+      default: true,
+    },
+  );
+
   const app = next({
     // passing in env here does not get the environment variables there
     dev: false,