Function getStaticPaths

apps/docs/src/pages/[[...markdownPath]].js:196–250

(context)

// Collect all MDX files for static generation.
export async function getStaticPaths(context) {
  const { promisify } = require('util')
  const { resolve } = require('path')
  const fs = require('fs')
  const readdir = promisify(fs.readdir)
  const stat = promisify(fs.stat)
  const rootDir = process.cwd() + '/src/content'

  // Find all MD files recursively.
  async function getFiles(dir) {
    const subdirs = await readdir(dir)
    const files = await Promise.all(
      subdirs.map(async subdir => {
        const res = resolve(dir, subdir)
        return (await stat(res)).isDirectory() ? getFiles(res) : res.slice(rootDir.length + 1)
      }),
    )
    return files.flat().filter(file => file.endsWith('.md'))
  }

  // 'foo/bar/baz.md' -> ['foo', 'bar', 'baz']
  // 'foo/bar/qux/index.md' -> ['foo', 'bar', 'qux']
  function getSegments(file) {
    const locale = context.locales.find(locale => file.endsWith(`.${locale}.md`))
    let segments = file
      .slice(0, (locale ? -locale.length - 1 : 0) - 3)
      .replace(/\\/g, '/')
      .split('/')

    if (segments[segments.length - 1] === 'index') {
      segments.pop()
    }
    return [segments, locale]
  }

  const files = await getFiles(rootDir)

  const paths = files.map(file => {
    const [paths, locale = 'en-US'] = getSegments(file)
    return {
      params: {
        markdownPath: paths,
        // ^^^ CAREFUL HERE.
        // If you rename markdownPath, update patches/next-remote-watch.patch too.
        // Otherwise you'll break Fast Refresh for all MD files.
      },
      locale,
    }
  })

  return {
    paths: paths,
    fallback: false,
  }
}