fix(nextjs): Delete css map files (#18131)

closes #18125

We want to delete `*.map.css` files when `deleteSourcemapsAfterUpload`
is enabled.

Author: chargome

packages/nextjs/src/config/getBuildPluginOptions.ts

@@ -40,7 +40,7 @@ const FILE_PATTERNS = {
 } as const;
 
 // Source map file extensions to delete
-const SOURCEMAP_EXTENSIONS = ['*.js.map', '*.mjs.map', '*.cjs.map'] as const;
+const SOURCEMAP_EXTENSIONS = ['*.js.map', '*.mjs.map', '*.cjs.map', '*.css.map'] as const;
 
 type BuildTool = keyof typeof LOGGER_PREFIXES;
 

packages/nextjs/test/config/getBuildPluginOptions.test.ts

@@ -308,6 +308,7 @@ describe('getBuildPluginOptions', () => {
         '/path/to/.next/static/**/*.js.map',
         '/path/to/.next/static/**/*.mjs.map',
         '/path/to/.next/static/**/*.cjs.map',
+        '/path/to/.next/static/**/*.css.map',
       ]);
     });
 
@@ -331,6 +332,7 @@ describe('getBuildPluginOptions', () => {
         '/path/to/.next/static/**/*.js.map',
         '/path/to/.next/static/**/*.mjs.map',
         '/path/to/.next/static/**/*.cjs.map',
+        '/path/to/.next/static/**/*.css.map',
       ]);
     });
 
@@ -355,6 +357,7 @@ describe('getBuildPluginOptions', () => {
         '/path/to/.next/static/**/*.js.map',
         '/path/to/.next/static/**/*.mjs.map',
         '/path/to/.next/static/**/*.cjs.map',
+        '/path/to/.next/static/**/*.css.map',
       ]);
     });
 
@@ -788,6 +791,7 @@ describe('getBuildPluginOptions', () => {
         `${complexPath}/static/**/*.js.map`,
         `${complexPath}/static/**/*.mjs.map`,
         `${complexPath}/static/**/*.cjs.map`,
+        `${complexPath}/static/**/*.css.map`,
       ]);
     });
   });