Fix

next.config.mjs

@@ -1,10 +1,38 @@
 import { createMDX } from 'fumadocs-mdx/next';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 const withMDX = createMDX();
 
-/** @type {import('next').NextConfig} */
 const config = {
   reactStrictMode: true,
 };
 
-export default withMDX(config);
+const nextConfig = withMDX(config);
+
+const mdxLoaderPath = path.resolve(__dirname, 'loaders/fumadocs-mdx-loader.cjs');
+const metaLoaderPath = path.resolve(__dirname, 'loaders/fumadocs-meta-loader.cjs');
+
+if (nextConfig.turbopack?.rules) {
+  for (const rule of Object.values(nextConfig.turbopack.rules)) {
+    if (rule.loaders) {
+      for (const l of rule.loaders) {
+        if (l.loader === 'fumadocs-mdx/webpack/mdx') l.loader = mdxLoaderPath;
+        if (l.loader === 'fumadocs-mdx/webpack/meta') l.loader = metaLoaderPath;
+      }
+    }
+  }
+}
+
+const origWebpack = nextConfig.webpack;
+nextConfig.webpack = (config, options) => {
+  config.resolveLoader ??= {};
+  config.resolveLoader.alias ??= {};
+  config.resolveLoader.alias['fumadocs-mdx/webpack/mdx'] = mdxLoaderPath;
+  config.resolveLoader.alias['fumadocs-mdx/webpack/meta'] = metaLoaderPath;
+  return origWebpack?.(config, options) ?? config;
+};
+
+export default nextConfig;