fix(css): remove pure css chunk sourcemap (#14290)

packages/vite/src/node/plugins/css.ts

@@ -789,6 +789,7 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
         pureCssChunkNames.forEach((fileName) => {
           removedPureCssFiles.set(fileName, bundle[fileName] as RenderedChunk)
           delete bundle[fileName]
+          delete bundle[`${fileName}.map`]
         })
       }
 

playground/css-sourcemap/__tests__/lib-entry/lib-entry.spec.ts

@@ -0,0 +1,8 @@
+import { describe, expect, test } from 'vitest'
+import { findAssetFile, isBuild } from '~utils'
+
+describe.runIf(isBuild)('css lib entry', () => {
+  test('remove useless js sourcemap', async () => {
+    expect(findAssetFile('linked.js.map', 'lib-entry', './')).toBe('')
+  })
+})

playground/css-sourcemap/index.js

@@ -0,0 +1 @@
+export default 'hello'

playground/css-sourcemap/vite.config-lib-entry.js

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  build: {
+    cssCodeSplit: true,
+    sourcemap: true,
+    outDir: 'dist/lib-entry',
+    lib: {
+      entry: ['./index.js', './linked.css'],
+      formats: ['es'],
+    },
+  },
+})