From c3f771fec844b3fe936c9e2f72b3f26a5b141437 Mon Sep 17 00:00:00 2001
From: Yuanlin Lin <im.yuanlinlin@gmail.com>
Date: Wed, 9 Mar 2022 18:02:55 +0800
Subject: [PATCH] feat(api-routes-vercel): Check there is vercel.json if user
 want to use API routes in vercel (#452)

---
 .../preset-umi/src/features/apiRoute/apiRoute.ts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/packages/preset-umi/src/features/apiRoute/apiRoute.ts b/packages/preset-umi/src/features/apiRoute/apiRoute.ts
index 429d31236abc..2859d3cc2742 100644
--- a/packages/preset-umi/src/features/apiRoute/apiRoute.ts
+++ b/packages/preset-umi/src/features/apiRoute/apiRoute.ts
@@ -76,6 +76,22 @@ export default (api: IApi) => {
         return false;
       }
 
+      // 如果是 Vercel 平台，则需要检查是否有配置了 Vercel 配置
+      if (!fs.existsSync(join(api.paths.cwd, 'vercel.json'))) {
+        logger.warn(
+          'You have enabled the API route feature, but there is no vercel.json file in your work directory! ' +
+            'Automatically creating a vercel.json file ...',
+        );
+        fs.writeFileSync(
+          join(api.paths.cwd, 'vercel.json'),
+          JSON.stringify(
+            { build: { env: { ENABLE_FILE_SYSTEM_API: '1' } } },
+            null,
+            2,
+          ),
+        );
+      }
+
       return true;
     },
   });