app/api/newsletter/route.ts

@@ -1,6 +1,8 @@
 import { NewsletterAPI } from 'pliny/newsletter'
 import siteMetadata from '@/data/siteMetadata'
 
+export const dynamic = 'force-static'
+
 const handler = NewsletterAPI({
   // @ts-ignore
   provider: siteMetadata.newsletter.provider,

app/robots.ts

@@ -1,6 +1,8 @@
 import { MetadataRoute } from 'next'
 import siteMetadata from '@/data/siteMetadata'
 
+export const dynamic = 'force-static'
+
 export default function robots(): MetadataRoute.Robots {
   return {
     rules: {

app/sitemap.ts

@@ -2,6 +2,8 @@ import { MetadataRoute } from 'next'
 import { allBlogs } from 'contentlayer/generated'
 import siteMetadata from '@/data/siteMetadata'
 
+export const dynamic = 'force-static'
+
 export default function sitemap(): MetadataRoute.Sitemap {
   const siteUrl = siteMetadata.siteUrl