Bring back NEXT_PUBLIC_BASE_URL

src/app/robots.ts

@@ -1,3 +1,4 @@
+import { env } from '@/lib/env'
 import { MetadataRoute } from 'next'
 
 export default function robots(): MetadataRoute.Robots {
@@ -7,8 +8,6 @@ export default function robots(): MetadataRoute.Robots {
       allow: '/',
       disallow: '/groups/',
     },
-    sitemap: process.env.VERCEL_URL
-      ? `${process.env.VERCEL_URL}/sitemap.xml`
-      : undefined,
+    sitemap: `${env.NEXT_PUBLIC_BASE_URL}/sitemap.xml`,
   }
 }

src/app/sitemap.ts

@@ -1,14 +1,13 @@
+import { env } from '@/lib/env'
 import { MetadataRoute } from 'next'
 
 export default function sitemap(): MetadataRoute.Sitemap {
-  return process.env.VERCEL_URL
-    ? [
-        {
-          url: process.env.VERCEL_URL,
-          lastModified: new Date(),
-          changeFrequency: 'yearly',
-          priority: 1,
-        },
-      ]
-    : []
+  return [
+    {
+      url: env.NEXT_PUBLIC_BASE_URL,
+      lastModified: new Date(),
+      changeFrequency: 'yearly',
+      priority: 1,
+    },
+  ]
 }

src/lib/env.ts

@@ -3,6 +3,14 @@ import { z } from 'zod'
 const envSchema = z.object({
   POSTGRES_URL_NON_POOLING: z.string().url(),
   POSTGRES_PRISMA_URL: z.string().url(),
+  NEXT_PUBLIC_BASE_URL: z
+    .string()
+    .optional()
+    .default(
+      process.env.VERCEL_URL
+        ? `https://${process.env.VERCEL_URL}`
+        : 'http://localhost:3000',
+    ),
 })
 
 export const env = envSchema.parse(process.env)