Move getBabelConfigFile to separate file

packages/next/src/build/get-babel-config-file.ts

@@ -0,0 +1,30 @@
+import { fileExists } from '../lib/file-exists'
+import { join } from 'path'
+
+const BABEL_CONFIG_FILES = [
+  '.babelrc',
+  '.babelrc.json',
+  '.babelrc.js',
+  '.babelrc.mjs',
+  '.babelrc.cjs',
+  'babel.config.js',
+  'babel.config.json',
+  'babel.config.mjs',
+  'babel.config.cjs',
+]
+
+export async function getBabelConfigFile(
+  dir: string
+): Promise<string | undefined> {
+  const babelConfigFile = await BABEL_CONFIG_FILES.reduce(
+    async (memo: Promise<string | undefined>, filename) => {
+      const configFilePath = join(dir, filename)
+      return (
+        (await memo) ||
+        ((await fileExists(configFilePath)) ? configFilePath : undefined)
+      )
+    },
+    Promise.resolve(undefined)
+  )
+  return babelConfigFile
+}

packages/next/src/build/webpack-config.ts

@@ -18,7 +18,6 @@ import {
   RSC_ACTION_VALIDATE_ALIAS,
   WEBPACK_RESOURCE_QUERIES,
 } from '../lib/constants'
-import { fileExists } from '../lib/file-exists'
 import { CustomRoutes } from '../lib/load-custom-routes.js'
 import { isEdgeRuntime } from '../lib/is-edge-runtime'
 import {
@@ -68,6 +67,7 @@ import { SubresourceIntegrityPlugin } from './webpack/plugins/subresource-integr
 import { NextFontManifestPlugin } from './webpack/plugins/next-font-manifest-plugin'
 import { getSupportedBrowsers } from './utils'
 import { MemoryWithGcCachePlugin } from './webpack/plugins/memory-with-gc-cache-plugin'
+import { getBabelConfigFile } from './get-babel-config-file'
 
 type ExcludesFalse = <T>(x: T | false) => x is T
 type ClientEntries = {
@@ -118,32 +118,6 @@ const mainFieldsPerCompiler: Record<CompilerNameValues, string[]> = {
   [COMPILER_NAMES.edgeServer]: edgeConditionNames,
 }
 
-const BABEL_CONFIG_FILES = [
-  '.babelrc',
-  '.babelrc.json',
-  '.babelrc.js',
-  '.babelrc.mjs',
-  '.babelrc.cjs',
-  'babel.config.js',
-  'babel.config.json',
-  'babel.config.mjs',
-  'babel.config.cjs',
-]
-
-export const getBabelConfigFile = async (dir: string) => {
-  const babelConfigFile = await BABEL_CONFIG_FILES.reduce(
-    async (memo: Promise<string | undefined>, filename) => {
-      const configFilePath = path.join(dir, filename)
-      return (
-        (await memo) ||
-        ((await fileExists(configFilePath)) ? configFilePath : undefined)
-      )
-    },
-    Promise.resolve(undefined)
-  )
-  return babelConfigFile
-}
-
 // Support for NODE_PATH
 const nodePathList = (process.env.NODE_PATH || '')
   .split(process.platform === 'win32' ? ';' : ':')

packages/next/src/lib/turbopack-warning.ts

@@ -78,7 +78,7 @@ export async function validateTurboNextConfig({
   const { getPkgManager } =
     require('../lib/helpers/get-pkg-manager') as typeof import('../lib/helpers/get-pkg-manager')
   const { getBabelConfigFile } =
-    require('../build/webpack-config') as typeof import('../build/webpack-config')
+    require('../build/get-babel-config-file') as typeof import('../build/get-babel-config-file')
   const { defaultConfig } =
     require('../server/config-shared') as typeof import('../server/config-shared')
   const chalk =