[turbopack] Clear chunk cache on HMR instead of creating new next-server VM (vercel#81664)

Author: eps1lon

packages/next/src/server/dev/hot-reloader-turbopack.ts

@@ -37,7 +37,7 @@ import {
 } from './middleware-turbopack'
 import { PageNotFoundError } from '../../shared/lib/utils'
 import { debounce } from '../utils'
-import { deleteCache, deleteFromRequireCache } from './require-cache'
+import { deleteCache } from './require-cache'
 import {
   clearAllModuleContexts,
   clearModuleContext,
@@ -342,30 +342,12 @@ export async function createHotReloaderTurbopack(
 
     resetFetch()
 
-    const hasAppPaths = writtenEndpoint.serverPaths.some(({ path: p }) =>
-      p.startsWith('server/app')
-    )
-
     // Edge uses the browser runtime which already disposes chunks individually.
     // TODO: process.env.NEXT_RUNTIME is 'nodejs' even though Node.js runtime is not used.
     if ('__turbopack_clear_chunk_cache__' in globalThis) {
       ;(globalThis as any).__turbopack_clear_chunk_cache__()
     }
 
-    // TODO: Stop re-evaluating React Client once it relies on Turbopack's chunk cache.
-    if (hasAppPaths) {
-      deleteFromRequireCache(
-        require.resolve(
-          'next/dist/compiled/next-server/app-page-turbo.runtime.dev.js'
-        )
-      )
-      deleteFromRequireCache(
-        require.resolve(
-          'next/dist/compiled/next-server/app-page-turbo-experimental.runtime.dev.js'
-        )
-      )
-    }
-
     const serverPaths = writtenEndpoint.serverPaths.map(({ path: p }) =>
       join(distDir, p)
     )

packages/next/src/server/dev/require-cache.ts

@@ -2,7 +2,7 @@ import isError from '../../lib/is-error'
 import { realpathSync } from '../../lib/realpath'
 import { clearManifestCache } from '../load-manifest.external'
 
-export function deleteFromRequireCache(filePath: string) {
+function deleteFromRequireCache(filePath: string) {
   try {
     filePath = realpathSync(filePath)
   } catch (e) {