Update NextConfig type to not require experimental or future fields (#…

…25517)

when typechecking next.config.js as described [in the docs](https://github.com/vercel/next.js/blob/canary/docs/basic-features/typescript.md#type-checking-nextconfigjs), an error would be thrown if `future` and `experimental` are missing. When using `Partial<>` in the type definition instead, it works as expected.

Fixes #25498

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes

packages/next/build/webpack/config/index.ts

@@ -1,5 +1,5 @@
 import { webpack } from 'next/dist/compiled/webpack/webpack'
-import { NextConfig } from '../../../server/config'
+import { NextConfigComplete } from '../../../server/config-shared'
 import { base } from './blocks/base'
 import { css } from './blocks/css'
 import { ConfigurationContext, pipe } from './utils'
@@ -24,7 +24,7 @@ export async function build(
     assetPrefix: string
     sassOptions: any
     productionBrowserSourceMaps: boolean
-    future: NextConfig['future']
+    future: NextConfigComplete['future']
     isCraCompat?: boolean
   }
 ): Promise<webpack.Configuration> {

packages/next/build/webpack/config/utils.ts

@@ -1,5 +1,5 @@
 import { webpack } from 'next/dist/compiled/webpack/webpack'
-import { NextConfig } from '../../../server/config'
+import { NextConfigComplete } from '../../../server/config-shared'
 
 export type ConfigurationContext = {
   rootDirectory: string
@@ -16,7 +16,7 @@ export type ConfigurationContext = {
   sassOptions: any
   productionBrowserSourceMaps: boolean
 
-  future: NextConfig['future']
+  future: NextConfigComplete['future']
 
   isCraCompat?: boolean
 }

packages/next/export/worker.ts

@@ -46,7 +46,7 @@ interface ExportPageInput {
   pagesDataDir: string
   renderOpts: RenderOpts
   buildExport?: boolean
-  serverRuntimeConfig: string
+  serverRuntimeConfig: { [key: string]: any }
   subFolders?: boolean
   serverless: boolean
   optimizeFonts: boolean

packages/next/server/config-shared.ts

@@ -62,15 +62,18 @@ export type NextConfig = { [key: string]: any } & {
   sassOptions?: { [key: string]: any }
   productionBrowserSourceMaps?: boolean
   optimizeFonts?: boolean
+  reactStrictMode?: boolean
+  publicRuntimeConfig?: { [key: string]: any }
+  serverRuntimeConfig?: { [key: string]: any }
 
-  future: {
+  future?: {
     /**
      * @deprecated this options was moved to the top level
      */
     webpack5?: false
     strictPostcssConfiguration?: boolean
   }
-  experimental: {
+  experimental?: {
     cpus?: number
     plugins?: boolean
     profiling?: boolean