import React from 'react' const posts = [ { slug: 'hello-world', title: 'Hello world' }, { slug: 'another-blog-post', title: 'Another blog post' } ] export default class extends React.Component { static async getInitialProps ({ query, res }) { const post = posts.find(post => post.slug === query.slug) if (!post && res) { res.statusCode = 404 } return { post } } render () { const { post } = this.props if (!post) return