fix: run prebundledReact if appDir exists in conf

Author: taty2010

packages/runtime/src/templates/server.ts

@@ -15,6 +15,8 @@ import {
   unlocalizeRoute,
   getMatchedRoute,
 } from './handlerUtils'
+import { join } from 'path'
+import { ExperimentalConfigWithLegacy } from '../helpers/utils'
 
 interface NetlifyConfig {
   revalidateToken?: string
@@ -30,11 +32,16 @@ const getNetlifyNextServer = (NextServer: NextServerType) => {
       return this.nextConfig.experimental?.serverActions ? 'experimental' : 'next'
     }
 
+    protected getManifest(manifest: string) {
+      // eslint-disable-next-line import/no-dynamic-require
+      return require(join(this.distDir, manifest))
+    }
+
     public constructor(options: Options, netlifyConfig: NetlifyConfig) {
       super(options)
       this.netlifyConfig = netlifyConfig
       // copy the prerender manifest so it doesn't get mutated by Next.js
-      const manifest = this.getPrerenderManifest()
+      const manifest = this.getPrerenderManifest() || this.getManifest('prerender-manifest.json')
       this.netlifyPrerenderManifest = {
         ...manifest,
         routes: { ...manifest.routes },
@@ -53,7 +60,8 @@ const getNetlifyNextServer = (NextServer: NextServerType) => {
         const { url, headers } = req
 
         // conditionally use the prebundled React module
-        this.netlifyPrebundleReact(url, this.nextConfig, parsedUrl)
+        const { appDir }: ExperimentalConfigWithLegacy = this.nextConfig.experimental
+        if (appDir) this.netlifyPrebundleReact(url, this.nextConfig, parsedUrl)
 
         // intercept on-demand revalidation requests and handle with the Netlify API
         if (headers['x-prerender-revalidate'] && this.netlifyConfig.revalidateToken) {
@@ -83,12 +91,12 @@ const getNetlifyNextServer = (NextServer: NextServerType) => {
 
     // doing what they do in https://github.com/vercel/vercel/blob/1663db7ca34d3dd99b57994f801fb30b72fbd2f3/packages/next/src/server-build.ts#L576-L580
     private async netlifyPrebundleReact(path: string, { basePath, trailingSlash }: NextConfig, parsedUrl) {
-      const routesManifest = this.getRoutesManifest?.()
+      const routesManifest = this.getRoutesManifest?.() || this.getManifest('routes-manifest.json')
       const appPathsRoutes = this.getAppPathRoutes?.()
       const routes = routesManifest && [...routesManifest.staticRoutes, ...routesManifest.dynamicRoutes]
       const matchedRoute = await getMatchedRoute(path, routes, parsedUrl, basePath, trailingSlash)
       const isAppRoute = appPathsRoutes && matchedRoute ? appPathsRoutes[matchedRoute.page] : false
-
+      
       if (isAppRoute) {
         // app routes should use prebundled React
         // eslint-disable-next-line no-underscore-dangle