Do not reset patched fetch during HMR

This should not be needed, now that React is not patching `fetch`
anymore (see facebook/react#28896). It was
previously done to fix a memory leak (see #43859).

This fixes a race condition where the original `fetch` was stored before
experimental test mode patched `fetch`, thus undoing the test mode
`fetch` patch when resetting `fetch` during HMR.

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

@@ -93,8 +93,7 @@ const isTestMode = !!(
 export async function createHotReloaderTurbopack(
   opts: SetupOpts,
   serverFields: ServerFields,
-  distDir: string,
-  resetFetch: () => void
+  distDir: string
 ): Promise<NextJsHotReloaderInterface> {
   const buildId = 'development'
   const { nextConfig, dir } = opts
@@ -238,8 +237,6 @@ export async function createHotReloaderTurbopack(
       }
     }
 
-    resetFetch()
-
     const hasAppPaths = writtenEndpoint.serverPaths.some(({ path: p }) =>
       p.startsWith('server/app')
     )

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

@@ -249,7 +249,6 @@ export default class HotReloaderWebpack implements NextJsHotReloaderInterface {
   private pagesMapping: { [key: string]: string } = {}
   private appDir?: string
   private telemetry: Telemetry
-  private resetFetch: () => void
   private versionInfo: VersionInfo = {
     staleness: 'unknown',
     installed: '0.0.0',
@@ -275,7 +274,6 @@ export default class HotReloaderWebpack implements NextJsHotReloaderInterface {
       rewrites,
       appDir,
       telemetry,
-      resetFetch,
     }: {
       config: NextConfigComplete
       pagesDir?: string
@@ -286,7 +284,6 @@ export default class HotReloaderWebpack implements NextJsHotReloaderInterface {
       rewrites: CustomRoutes['rewrites']
       appDir?: string
       telemetry: Telemetry
-      resetFetch: () => void
     }
   ) {
     this.hasAmpEntrypoints = false
@@ -304,7 +301,6 @@ export default class HotReloaderWebpack implements NextJsHotReloaderInterface {
     this.edgeServerStats = null
     this.serverPrevDocumentHash = null
     this.telemetry = telemetry
-    this.resetFetch = resetFetch
 
     this.config = config
     this.previewProps = previewProps
@@ -1369,7 +1365,6 @@ export default class HotReloaderWebpack implements NextJsHotReloaderInterface {
         changedCSSImportPages.size ||
         reloadAfterInvalidation
       ) {
-        this.resetFetch()
         this.refreshServerComponents()
       }
 

packages/next/src/server/lib/router-utils/setup-dev-bundler.ts

@@ -89,7 +89,6 @@ import { normalizeMetadataPageToRoute } from '../../../lib/metadata/get-metadata
 import { createEnvDefinitions } from '../experimental/create-env-definitions'
 import { JsConfigPathsPlugin } from '../../../build/webpack/plugins/jsconfig-paths-plugin'
 import { store as consoleStore } from '../../../build/output/store'
-import { NEXT_PATCH_SYMBOL } from '../patch-fetch'
 
 export type SetupOpts = {
   renderServer: LazyRenderServerInstance
@@ -123,7 +122,6 @@ export type ServerFields = {
     typeof import('./filesystem').buildCustomRoute
   >[]
   setAppIsrStatus?: (key: string, value: false | number | null) => void
-  resetFetch?: () => void
 }
 
 async function verifyTypeScript(opts: SetupOpts) {
@@ -183,15 +181,8 @@ async function startWatcher(opts: SetupOpts) {
     logging: nextConfig.logging !== false,
   })
 
-  const originalFetch = global.fetch
-  const resetFetch = () => {
-    global.fetch = originalFetch
-    // @ts-ignore
-    global[NEXT_PATCH_SYMBOL] = false
-  }
-
   const hotReloader: NextJsHotReloaderInterface = opts.turbo
-    ? await createHotReloaderTurbopack(opts, serverFields, distDir, resetFetch)
+    ? await createHotReloaderTurbopack(opts, serverFields, distDir)
     : new HotReloaderWebpack(opts.dir, {
         appDir,
         pagesDir,
@@ -202,7 +193,6 @@ async function startWatcher(opts: SetupOpts) {
         telemetry: opts.telemetry,
         rewrites: opts.fsChecker.rewrites,
         previewProps: opts.fsChecker.prerenderManifest.preview,
-        resetFetch: resetFetch,
       })
 
   await hotReloader.start()