vercel__next.js/examples/cms-webiny/pages/posts/[slug].tsx

import { useRouter } from "next/router";
import ErrorPage from "next/error";
import Container from "../../components/container";
import PostBody from "../../components/post-body";
import Header from "../../components/header";
import PostHeader from "../../components/post-header";
import MoreStories from "../../components/more-stories";
import SectionSeparator from "../../components/section-separator";
import Layout from "../../components/layout";
import { getPostBySlug, getAllPostsWithSlug } from "../../lib/api";
import PostTitle from "../../components/post-title";
import Head from "next/head";
import { CMS_NAME } from "../../lib/constants";

export default function Post({ post, morePosts, preview }) {
  const router = useRouter();
  if (!router.isFallback && !post?.slug) {
    return <ErrorPage statusCode={404} />;
  }
  return (
    <Layout preview={preview}>
      <Container>
        <Header />
        {router.isFallback ? (
          <PostTitle>Loading…</PostTitle>
        ) : (
          <>
            <article className="mb-32">
              <Head>
                <title>
                  {`${post.title} | Next.js Blog Example with ${CMS_NAME}`}
                </title>
                <meta property="og:image" content={post.featuredImage} />
              </Head>
              <PostHeader
                title={post.title}
                coverImage={post.featuredImage}
                date={post.createdOn}
                author={post.author}
              />
              <PostBody content={post.body} />
            </article>
            <SectionSeparator />
            {morePosts.data.length > 0 && (
              <MoreStories posts={morePosts.data} />
            )}
          </>
        )}
      </Container>
    </Layout>
  );
}

export async function getStaticProps(context) {
  const data = await getPostBySlug(context.params.slug, context.preview);

  return {
    props: {
      preview: context.preview ?? false,
      post: {
        ...data.post.data,
      },
      morePosts: data.morePosts,
    },
  };
}

export async function getStaticPaths() {
  const allPosts = await getAllPostsWithSlug();

  return {
    paths: allPosts.map((post) => {
      return {
        params: {
          slug: `/posts/${post.slug}`,
        },
      };
    }),
    fallback: true,
  };
}