From ccc180c9d47a88635e22b210685115d56cd5a096 Mon Sep 17 00:00:00 2001
From: Alec Larson <1925840+aleclarson@users.noreply.github.com>
Date: Thu, 22 Jul 2021 17:25:41 -0400
Subject: [PATCH] fix: prefer .js over .mjs

---
 packages/vite/src/node/ssr/ssrModuleLoader.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/vite/src/node/ssr/ssrModuleLoader.ts b/packages/vite/src/node/ssr/ssrModuleLoader.ts
index b9e5c5d17d1fc3..6ec0cbf08c9fba 100644
--- a/packages/vite/src/node/ssr/ssrModuleLoader.ts
+++ b/packages/vite/src/node/ssr/ssrModuleLoader.ts
@@ -97,6 +97,8 @@ async function instantiateModule(
   const resolveOptions: InternalResolveOptions = {
     conditions: ['node'],
     dedupe,
+    // Prefer CommonJS modules.
+    extensions: ['.js', '.mjs', '.ts', '.jsx', '.tsx', '.json'],
     isBuild: true,
     isProduction,
     // Disable "module" condition.