Build a Blog Platform REST API

Problem/Feature Description

A content team needs a REST API for their blogging platform. The API is built with Express and TypeScript. A Next.js frontend hosted on a different domain will consume it. The API will eventually run on a cloud VM behind a load balancer.

The API needs the following endpoints:

• GET /api/posts -- list all published posts (supports ?page=1&sort=date query parameters)
• GET /api/posts/:slug -- get a single post by its URL slug
• POST /api/posts -- create a new blog post (accepts title, content, tags array)
• PATCH /api/posts/:slug -- update an existing post
• DELETE /api/posts/:slug -- delete a post
• POST /api/posts/:slug/comments -- add a comment to a post (accepts author and body)

Use an in-memory array as the data store. Posts should have id, title, slug, content, tags, comments, published, and createdAt fields. Generate slugs from titles.

Output Specification

Produce:

• app.ts -- Express application with all middleware and route setup
• routes/posts.ts -- Router module with the blog post CRUD handlers
• package.json -- With all required dependencies