pageExtensions

By default, Next.js accepts files with the following extensions: .tsx, .ts, .jsx, .js. This can be modified to allow other extensions like markdown (.md, .mdx).

const withMDX = require("@next/mdx")();

/** @type {import('next').NextConfig} */
const nextConfig = {
  pageExtensions: ["js", "jsx", "ts", "tsx", "md", "mdx"],
};

module.exports = withMDX(nextConfig);