docs/examples/simple-mdx/app/source.ts

import { map } from '@/.map';
import { createMDXSource } from 'fumadocs-mdx';
import { loader } from 'fumadocs-core/source';

export const { getPage, getPages, pageTree } = loader({
  baseUrl: '/docs',
  rootDir: 'docs',
  languages,
  source: createMDXSource(map),
});