fix: prevent bundling of ZodError type

Author: SukkaW

packages/next/src/server/config-shared.ts

@@ -10,7 +10,6 @@ import { SubresourceIntegrityAlgorithm } from '../build/webpack/plugins/subresou
 import { WEB_VITALS } from '../shared/lib/utils'
 import type { NextParsedUrlQuery } from './request-meta'
 import { SizeLimit } from '../../types'
-import type { ZodError } from 'zod'
 
 export type NextConfigComplete = Required<NextConfig> & {
   images: Required<ImageConfigComplete>
@@ -781,18 +780,3 @@ export async function normalizeConfig(phase: string, config: any) {
   // Support `new Promise` and `async () =>` as return values of the config export
   return await config
 }
-
-export function validateConfig(userConfig: NextConfig): ZodError | null {
-  if (process.env.NEXT_MINIMAL) {
-    return null
-  }
-
-  const { configSchema } =
-    require('./config-schema') as typeof import('./config-schema')
-  const state = configSchema.safeParse(userConfig)
-  if (state.success) {
-    return null
-  }
-
-  return state.error
-}

packages/next/src/server/config.ts

@@ -9,7 +9,6 @@ import {
   normalizeConfig,
   ExperimentalConfig,
   NextConfigComplete,
-  validateConfig,
   NextConfig,
   TurboLoaderItem,
 } from './config-shared'
@@ -955,31 +954,36 @@ export default async function loadConfig(
       userConfigModule.default || userConfigModule
     )
 
-    const validateError = validateConfig(userConfig)
+    if (!process.env.NEXT_MINIMAL) {
+      // We only validate the config against schema in non minimal mode
+      const { configSchema } =
+        require('./config-schema') as typeof import('./config-schema')
+      const state = configSchema.safeParse(userConfig)
 
-    if (validateError) {
-      // error message header
-      const messages = [`Invalid ${configFileName} options detected: `]
+      if (!state.success) {
+        // error message header
+        const messages = [`Invalid ${configFileName} options detected: `]
 
-      const [errorMessages, shouldExit] = normalizeZodErrors(validateError)
-      // ident list item
-      for (const error of errorMessages) {
-        messages.push(`    ${error}`)
-      }
+        const [errorMessages, shouldExit] = normalizeZodErrors(state.error)
+        // ident list item
+        for (const error of errorMessages) {
+          messages.push(`    ${error}`)
+        }
 
-      // error message footer
-      messages.push(
-        'See more info here: https://nextjs.org/docs/messages/invalid-next-config'
-      )
+        // error message footer
+        messages.push(
+          'See more info here: https://nextjs.org/docs/messages/invalid-next-config'
+        )
 
-      if (shouldExit) {
-        for (const message of messages) {
-          console.error(message)
-        }
-        await flushAndExit(1)
-      } else {
-        for (const message of messages) {
-          curLog.warn(message)
+        if (shouldExit) {
+          for (const message of messages) {
+            console.error(message)
+          }
+          await flushAndExit(1)
+        } else {
+          for (const message of messages) {
+            curLog.warn(message)
+          }
         }
       }
     }