fix(landing): graceful not-found handling for blog and library posts and authors

apps/sim/app/(landing)/blog/[slug]/page.tsx

@@ -1,4 +1,5 @@
 import type { Metadata } from 'next'
+import { notFound } from 'next/navigation'
 import { getAllPostMeta, getPostBySlug, getRelatedPosts } from '@/lib/blog/registry'
 import { BLOG_SECTION, buildPostGraphJsonLd, buildPostMetadata } from '@/lib/blog/seo'
 import { getBaseUrl } from '@/lib/core/utils/urls'
@@ -18,6 +19,7 @@ export async function generateMetadata({
 }): Promise<Metadata> {
   const { slug } = await params
   const post = await getPostBySlug(slug)
+  if (!post) return {}
   return buildPostMetadata(post)
 }
 
@@ -26,6 +28,7 @@ export const revalidate = 86400
 export default async function Page({ params }: { params: Promise<{ slug: string }> }) {
   const { slug } = await params
   const post = await getPostBySlug(slug)
+  if (!post) notFound()
   const related = await getRelatedPosts(slug, 3)
 
   return (

apps/sim/app/(landing)/blog/authors/[id]/page.tsx

@@ -1,4 +1,5 @@
 import type { Metadata } from 'next'
+import { notFound } from 'next/navigation'
 import { getAllPostMeta } from '@/lib/blog/registry'
 import { BLOG_SECTION, buildAuthorGraphJsonLd, buildAuthorMetadata } from '@/lib/blog/seo'
 import { ContentAuthorPage } from '@/app/(landing)/components'
@@ -13,22 +14,24 @@ export async function generateMetadata({
   const { id } = await params
   const posts = (await getAllPostMeta()).filter((p) => p.authors.some((a) => a.id === id))
   const author = posts[0]?.authors.find((a) => a.id === id)
+  if (!author) return {}
   return buildAuthorMetadata(id, author)
 }
 
 export default async function AuthorPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params
   const posts = (await getAllPostMeta()).filter((p) => p.authors.some((a) => a.id === id))
   const author = posts[0]?.authors.find((a) => a.id === id)
+  if (!author) notFound()
 
   return (
     <ContentAuthorPage
       basePath={BLOG_SECTION.basePath}
       sectionName={BLOG_SECTION.name}
-      authorName={author?.name}
-      authorAvatarUrl={author?.avatarUrl}
+      authorName={author.name}
+      authorAvatarUrl={author.avatarUrl}
       posts={posts}
-      graphJsonLd={author ? buildAuthorGraphJsonLd(author) : undefined}
+      graphJsonLd={buildAuthorGraphJsonLd(author)}
     />
   )
 }

apps/sim/app/(landing)/blog/authors/not-found.tsx

@@ -0,0 +1,26 @@
+import { ChipLink } from '@sim/emcn'
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Page Not Found',
+  robots: { index: false, follow: true },
+}
+
+export default function BlogAuthorNotFound() {
+  return (
+    <main
+      id='main-content'
+      className='mx-auto flex min-h-[60vh] w-full max-w-[1460px] flex-col items-center justify-center gap-3 px-20 py-24 text-center max-sm:px-5 max-lg:px-8'
+    >
+      <h1 className='text-balance text-[40px] text-[var(--text-primary)] leading-[110%] tracking-[-0.02em]'>
+        Author not found
+      </h1>
+      <p className='text-[var(--text-muted)] text-lg'>
+        The author you&apos;re looking for doesn&apos;t exist or has been moved.
+      </p>
+      <ChipLink variant='primary' href='/blog' className='mt-3'>
+        Browse blog
+      </ChipLink>
+    </main>
+  )
+}

apps/sim/app/(landing)/blog/not-found.tsx

@@ -0,0 +1,26 @@
+import { ChipLink } from '@sim/emcn'
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Page Not Found',
+  robots: { index: false, follow: true },
+}
+
+export default function BlogNotFound() {
+  return (
+    <main
+      id='main-content'
+      className='mx-auto flex min-h-[60vh] w-full max-w-[1460px] flex-col items-center justify-center gap-3 px-20 py-24 text-center max-sm:px-5 max-lg:px-8'
+    >
+      <h1 className='text-balance text-[40px] text-[var(--text-primary)] leading-[110%] tracking-[-0.02em]'>
+        Post not found
+      </h1>
+      <p className='text-[var(--text-muted)] text-lg'>
+        The post you&apos;re looking for doesn&apos;t exist or has been moved.
+      </p>
+      <ChipLink variant='primary' href='/blog' className='mt-3'>
+        Browse blog
+      </ChipLink>
+    </main>
+  )
+}

apps/sim/app/(landing)/components/content-author-page/content-author-page.tsx

@@ -1,4 +1,3 @@
-import { ChipLink } from '@sim/emcn'
 import Image from 'next/image'
 import Link from 'next/link'
 import type { ContentMeta } from '@/lib/content/schema'
@@ -9,9 +8,9 @@ import { JsonLd } from '@/app/(landing)/components/json-ld'
 interface ContentAuthorPageProps {
   /** Route base path, e.g. `/blog` or `/library`. */
   basePath: string
-  /** Section label used in the not-found fallback, e.g. "Blog" or "Library". */
+  /** Section label used in the back link, e.g. "Blog" or "Library". */
   sectionName: string
-  authorName?: string
+  authorName: string
   authorAvatarUrl?: string
   /** Posts already filtered down to this author. */
   posts: ContentMeta[]
@@ -32,22 +31,6 @@ export function ContentAuthorPage({
   posts,
   graphJsonLd,
 }: ContentAuthorPageProps) {
-  if (!authorName) {
-    return (
-      <section className='mx-auto flex min-h-[60vh] w-full max-w-[1460px] flex-col items-center justify-center gap-3 px-20 py-24 text-center max-sm:px-5 max-lg:px-8'>
-        <h1 className='text-balance text-[40px] text-[var(--text-primary)] leading-[110%] tracking-[-0.02em]'>
-          Author not found
-        </h1>
-        <p className='text-[var(--text-muted)] text-lg'>
-          The author you&apos;re looking for doesn&apos;t exist or has been moved.
-        </p>
-        <ChipLink variant='primary' href={basePath} className='mt-3'>
-          Browse {sectionName}
-        </ChipLink>
-      </section>
-    )
-  }
-
   return (
     <>
       <section className='bg-[var(--bg)]'>

apps/sim/app/(landing)/library/[slug]/page.tsx

@@ -1,4 +1,5 @@
 import type { Metadata } from 'next'
+import { notFound } from 'next/navigation'
 import { getBaseUrl } from '@/lib/core/utils/urls'
 import { getAllPostMeta, getPostBySlug, getRelatedPosts } from '@/lib/library/registry'
 import { buildPostGraphJsonLd, buildPostMetadata, LIBRARY_SECTION } from '@/lib/library/seo'
@@ -18,6 +19,7 @@ export async function generateMetadata({
 }): Promise<Metadata> {
   const { slug } = await params
   const post = await getPostBySlug(slug)
+  if (!post) return {}
   return buildPostMetadata(post)
 }
 
@@ -26,6 +28,7 @@ export const revalidate = 86400
 export default async function Page({ params }: { params: Promise<{ slug: string }> }) {
   const { slug } = await params
   const post = await getPostBySlug(slug)
+  if (!post) notFound()
   const related = await getRelatedPosts(slug, 3)
 
   return (

apps/sim/app/(landing)/library/authors/[id]/page.tsx

@@ -1,4 +1,5 @@
 import type { Metadata } from 'next'
+import { notFound } from 'next/navigation'
 import { getAllPostMeta } from '@/lib/library/registry'
 import { buildAuthorGraphJsonLd, buildAuthorMetadata, LIBRARY_SECTION } from '@/lib/library/seo'
 import { ContentAuthorPage } from '@/app/(landing)/components'
@@ -13,22 +14,24 @@ export async function generateMetadata({
   const { id } = await params
   const posts = (await getAllPostMeta()).filter((p) => p.authors.some((a) => a.id === id))
   const author = posts[0]?.authors.find((a) => a.id === id)
+  if (!author) return {}
   return buildAuthorMetadata(id, author)
 }
 
 export default async function AuthorPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params
   const posts = (await getAllPostMeta()).filter((p) => p.authors.some((a) => a.id === id))
   const author = posts[0]?.authors.find((a) => a.id === id)
+  if (!author) notFound()
 
   return (
     <ContentAuthorPage
       basePath={LIBRARY_SECTION.basePath}
       sectionName={LIBRARY_SECTION.name}
-      authorName={author?.name}
-      authorAvatarUrl={author?.avatarUrl}
+      authorName={author.name}
+      authorAvatarUrl={author.avatarUrl}
       posts={posts}
-      graphJsonLd={author ? buildAuthorGraphJsonLd(author) : undefined}
+      graphJsonLd={buildAuthorGraphJsonLd(author)}
     />
   )
 }

apps/sim/app/(landing)/library/authors/not-found.tsx

@@ -0,0 +1,26 @@
+import { ChipLink } from '@sim/emcn'
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Page Not Found',
+  robots: { index: false, follow: true },
+}
+
+export default function LibraryAuthorNotFound() {
+  return (
+    <main
+      id='main-content'
+      className='mx-auto flex min-h-[60vh] w-full max-w-[1460px] flex-col items-center justify-center gap-3 px-20 py-24 text-center max-sm:px-5 max-lg:px-8'
+    >
+      <h1 className='text-balance text-[40px] text-[var(--text-primary)] leading-[110%] tracking-[-0.02em]'>
+        Author not found
+      </h1>
+      <p className='text-[var(--text-muted)] text-lg'>
+        The author you&apos;re looking for doesn&apos;t exist or has been moved.
+      </p>
+      <ChipLink variant='primary' href='/library' className='mt-3'>
+        Browse library
+      </ChipLink>
+    </main>
+  )
+}

apps/sim/app/(landing)/library/not-found.tsx

@@ -0,0 +1,26 @@
+import { ChipLink } from '@sim/emcn'
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Page Not Found',
+  robots: { index: false, follow: true },
+}
+
+export default function LibraryNotFound() {
+  return (
+    <main
+      id='main-content'
+      className='mx-auto flex min-h-[60vh] w-full max-w-[1460px] flex-col items-center justify-center gap-3 px-20 py-24 text-center max-sm:px-5 max-lg:px-8'
+    >
+      <h1 className='text-balance text-[40px] text-[var(--text-primary)] leading-[110%] tracking-[-0.02em]'>
+        Post not found
+      </h1>
+      <p className='text-[var(--text-muted)] text-lg'>
+        The post you&apos;re looking for doesn&apos;t exist or has been moved.
+      </p>
+      <ChipLink variant='primary' href='/library' className='mt-3'>
+        Browse library
+      </ChipLink>
+    </main>
+  )
+}

apps/sim/lib/content/registry-factory.ts

@@ -29,7 +29,7 @@ export interface ContentRegistryConfig {
 
 export interface ContentRegistry {
   getAllPostMeta: () => Promise<ContentMeta[]>
-  getPostBySlug: (slug: string) => Promise<ContentPost>
+  getPostBySlug: (slug: string) => Promise<ContentPost | null>
   getAllTags: () => Promise<TagWithCount[]>
   getRelatedPosts: (slug: string, limit?: number) => Promise<ContentMeta[]>
   getNavPosts: () => Promise<Pick<ContentMeta, 'slug' | 'title' | 'ogImage'>[]>
@@ -225,10 +225,10 @@ export function createContentRegistry(config: ContentRegistryConfig): ContentReg
     }
   }
 
-  async function getPostBySlug(slug: string): Promise<ContentPost> {
+  async function getPostBySlug(slug: string): Promise<ContentPost | null> {
     const meta = await scanFrontmatters()
     const found = meta.find((m) => m.slug === slug)
-    if (!found) throw new Error(`Post not found: ${slug}`)
+    if (!found) return null
     const mdxPath = path.join(contentDir, slug, 'index.mdx')
     const raw = await fs.readFile(mdxPath, 'utf-8')
     const { content, data } = matter(raw)