/**
 * Currently it's not possible to export data fetching functions from MDX pages
 * because MDX includes them in `layoutProps`, and Next.js removes them at some
 * point, causing a `ReferenceError`.
 *
 * https://github.com/mdx-js/mdx/issues/742#issuecomment-612652071
 *
 * This plugin can be removed once MDX removes `layoutProps`, at least that
 * seems to be the current plan.
 */

// https://nextjs.org/docs/basic-features/data-fetching
const DATA_FETCH_FNS = ['getStaticPaths', 'getStaticProps', 'getServerProps']

module.exports = () => {
  return {
    visitor: {
      ObjectProperty(path) {
        if (
          DATA_FETCH_FNS.includes(path.node.value.name) &&
          path.findParent(
            (path) =>
              path.isVariableDeclarator() &&
              path.node.id.name === 'layoutProps',
          )
        ) {
          path.remove()
        }
      },
    },
  }
}