remove warning `Watchpack Error (initial scan): Error: ENOTDIR: not a…

… directory, scandir 'path-to-your-node_modules/next/dist/pages/_app.js'` (#3328)

* aa

* aa

* fix

.changeset/cyan-points-fail.md

@@ -0,0 +1,5 @@
+---
+'nextra': patch
+---
+
+remove warning `Watchpack Error (initial scan): Error: ENOTDIR: not a directory, scandir 'path-to-your-node_modules/next/dist/pages/_app.js'`

packages/nextra/src/server/index.ts

@@ -1,6 +1,5 @@
 /* eslint-env node */
-import { createRequire } from 'node:module'
-import { sep } from 'node:path'
+import { join, sep } from 'node:path'
 import type { NextConfig } from 'next'
 import { fromZodError } from 'zod-validation-error'
 import type { Nextra } from '../types'
@@ -19,8 +18,6 @@ import { NextraPlugin, NextraSearchPlugin } from './webpack-plugins/index.js'
 
 const DEFAULT_EXTENSIONS = ['js', 'jsx', 'ts', 'tsx']
 
-const require = createRequire(import.meta.url)
-
 const AGNOSTIC_PAGE_MAP_PATH = `.next${sep}static${sep}chunks${sep}nextra-page-map`
 
 const nextra: Nextra = nextraConfig => {
@@ -124,14 +121,20 @@ const nextra: Nextra = nextraConfig => {
             )
           }
         }
-
-        const defaultESMAppPath = require.resolve('next/dist/esm/pages/_app.js')
-        const defaultCJSAppPath = require.resolve('next/dist/pages/_app.js')
-
-        config.resolve.alias = {
-          ...config.resolve.alias,
-          // Resolves ESM _app file instead cjs, so we could import theme.config via `import` statement
-          [defaultCJSAppPath]: defaultESMAppPath
+        config.resolve.alias = { ...config.resolve.alias }
+        const { alias } = config.resolve
+
+        const appAlias = alias['private-next-pages/_app']
+        const appESM = 'next/dist/esm/pages/_app'
+        if (appAlias) {
+          alias['private-next-pages/_app'] = [
+            // Cut last element which points to CJS _app file
+            ...appAlias.slice(0, -1),
+            // Resolves ESM _app file instead CJS, so we could import `theme.config` via `import` statement
+            appESM
+          ]
+        } else {
+          alias[join(alias.next, 'dist', 'pages', '_app')] = appESM
         }
         const rules = config.module.rules as RuleSetRule[]