Remove future.strictPostcssConfiguration config (#32098)

Author: timneutkens

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

@@ -42,7 +42,6 @@ let postcssInstancePromise: Promise<any>
 export async function lazyPostCSS(
   rootDirectory: string,
   supportedBrowsers: string[] | undefined,
-  strictPostcssConfiguration: boolean | undefined,
   disablePostcssPresetEnv: boolean | undefined
 ) {
   if (!postcssInstancePromise) {
@@ -117,7 +116,6 @@ export async function lazyPostCSS(
       const postCssPlugins = await getPostCssPlugins(
         rootDirectory,
         supportedBrowsers,
-        strictPostcssConfiguration,
         disablePostcssPresetEnv
       )
 
@@ -145,7 +143,6 @@ export const css = curry(async function css(
     lazyPostCSS(
       ctx.rootDirectory,
       ctx.supportedBrowsers,
-      ctx.future.strictPostcssConfiguration,
       ctx.experimental.disablePostcssPresetEnv
     )
 

packages/next/build/webpack/config/blocks/css/plugins.ts

@@ -117,12 +117,12 @@ function getDefaultPlugins(
 export async function getPostCssPlugins(
   dir: string,
   supportedBrowsers: string[] | undefined,
-  defaults: boolean = false,
   disablePostcssPresetEnv: boolean = false
 ): Promise<import('postcss').AcceptedPlugin[]> {
-  let config = defaults
-    ? null
-    : await findConfig<{ plugins: CssPluginCollection }>(dir, 'postcss')
+  let config = await findConfig<{ plugins: CssPluginCollection }>(
+    dir,
+    'postcss'
+  )
 
   if (config == null) {
     config = {

packages/next/server/config-shared.ts

@@ -119,7 +119,6 @@ export type NextConfig = { [key: string]: any } & {
      * @deprecated this options was moved to the top level
      */
     webpack5?: false
-    strictPostcssConfiguration?: boolean
   }
   outputFileTracing?: boolean
   staticPageGenerationTimeout?: number
@@ -255,9 +254,6 @@ export const defaultConfig: NextConfig = {
     outputFileTracingRoot: process.env.NEXT_PRIVATE_OUTPUT_TRACE_ROOT || '',
     outputStandalone: !!process.env.NEXT_PRIVATE_STANDALONE,
   },
-  future: {
-    strictPostcssConfiguration: false,
-  },
 }
 
 export function normalizeConfig(phase: string, config: any) {