[Nextra 4] Add a config param to ignore AppDir content

[GuillaumeDSM]

Hello!
First of all, thanks a lot for your great work with Nextra and the update to Nextra 4.

I'm currently updating to Nextra 4 and I have the following situation.
My existing Next.js AppDir website with a locales uses next-intl for localisation (https://github.com/amannn/next-intl) and is using many different types of .tsx pages, groups etc: (pages) [pages].
This was perfectly fine in Nextra 3 since nextra content was in /pages. I migrated the website to Nextra 4 using the Using Content Directory Convention and the issue is that my AppDir content (which deosn't contain any Nextra page) is crashing the PageMap function.

Right now, I have to patch the Nextra 4 code to force it to ignore AppDir content, this way it work.

=> Would it be possible to add an option in withNextra config param not to explore the AppDir content when Nextra content is set to use the Content Directory Convention please ?

Here is the patch I had to add:

diff --git a/dist/server/page-map/find-meta-and-page-file-paths.js b/dist/server/page-map/find-meta-and-page-file-paths.js
index e9bdc946c78e917d83de9584c04206d0c62a84a8..9cd9c92e88991e0a475f1eb19671b4445322ebe0 100644
--- a/dist/server/page-map/find-meta-and-page-file-paths.js
+++ b/dist/server/page-map/find-meta-and-page-file-paths.js
@@ -14,13 +14,15 @@ async function findMetaAndPageFilePaths({
     `${contentDir}/**/_meta.{js,jsx,ts,tsx}`,
     // Include `_meta` files from `content` directory
     `${contentDir}/**/*.{md,mdx}`,
-    // Include all Markdown/MDX files from `content` directory
-    `${appDir}/**/page.{js,jsx,jsx,tsx,md,mdx}`,
-    `${appDir}/**/_meta.{js,jsx,ts,tsx}`,
-    // Include `_meta` files from `app` directory
-    `${appDir}/_meta.global.{js,jsx,ts,tsx}`,
-    // Include global `_meta` file from `app` directory
-    `!${appDir}/**/{_,[}*/*`
+    // START LOCAL PATCH
+    // // Include all Markdown/MDX files from `content` directory
+    // `${appDir}/**/page.{js,jsx,jsx,tsx,md,mdx}`,
+    // `${appDir}/**/_meta.{js,jsx,ts,tsx}`,
+    // // Include `_meta` files from `app` directory
+    // `${appDir}/_meta.global.{js,jsx,ts,tsx}`,
+    // // Include global `_meta` file from `app` directory
+    // `!${appDir}/**/{_,[}*/*`
+    // END LOCAL PATCH
     // Ignore subdirectories starting with `_` and dynamic routes
   ] : ["**/_meta.{js,jsx,ts,tsx}", "**/*.{md,mdx}"];
   const result = await fg(pattern, { cwd });

And here is the error:

../../../node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected][email protected][email protected]_tad3r3bwmk4rowd6m4b3glsev4/node_modules/nextra/dist/server/page-map/placeholder.js?lang=
Error: Can't find "page" file for:
{
  "path": "[locale]",
  "mdxPages": {
    "[locale]/account": "app/[locale]/(app)/account/page.tsx",
    "[locale]/account/settings": "app/[locale]/(app)/account/settings/page.tsx",
    "[locale]/account/subscription": "app/[locale]/(app)/account/subscription/page.tsx",

...

at Array.map (<anonymous>)
../../../node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected][email protected][email protected]_tad3r3bwmk4rowd6m4b3glsev4/node_modules/nextra/dist/server/p../../../node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected][email protected][email protected]_tad3r3bwmk4rowd6m4b3glsev4/node_modules/nextra/dist/server/page-map/placeholder.js?lang=
../../../node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected][email protected][email protected]_tad3r3bwmk4rowd6m4b3glsev4/node_modules/nextra/dist/server/page-map/get.js
../../../node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected][email protected][email protected]_tad3r3bwmk4rowd6m4b3glsev4/node_modules/nextra/dist/client/pages.js
./app/(nextra)/[locale]/blog/[[...mdxPath]]/page.tsx

[dimaMachina]

Dynamic folders [something] should be ignored according this line

nextra/packages/nextra/src/server/page-map/find-meta-and-page-file-paths.ts

Line 27 in 7621f70

`!${appDir}/**/{_,[}*/*` // Ignore subdirectories starting with `_` and dynamic routes

could you add a failing test? and I will fix it

example of test