fix: reuse findNearestMainPackageData at more places

Author: Jinjiang

packages/vite/src/node/build.ts

@@ -60,7 +60,7 @@ import { dataURIPlugin } from './plugins/dataUri'
 import { buildImportAnalysisPlugin } from './plugins/importAnalysisBuild'
 import { ssrManifestPlugin } from './ssr/ssrManifestPlugin'
 import { buildLoadFallbackPlugin } from './plugins/loadFallback'
-import { findNearestPackageData } from './packages'
+import { findNearestMainPackageData, findNearestPackageData } from './packages'
 import type { PackageCache } from './packages'
 import {
   getResolvedOutDirs,
@@ -919,7 +919,7 @@ export function resolveLibFilename(
     return libOptions.fileName(format, entryName)
   }
 
-  const packageJson = findNearestPackageData(root, packageCache)?.data
+  const packageJson = findNearestMainPackageData(root, packageCache)?.data
   const name =
     libOptions.fileName ||
     (packageJson && typeof libOptions.entry === 'string'

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

@@ -91,7 +91,7 @@ import type { TransformPluginContext } from '../server/pluginContainer'
 import { searchForWorkspaceRoot } from '../server/searchRoot'
 import { type DevEnvironment } from '..'
 import type { PackageCache } from '../packages'
-import { findNearestPackageData } from '../packages'
+import { findNearestMainPackageData } from '../packages'
 import { addToHTMLProxyTransformResult } from './html'
 import {
   assetUrlRE,
@@ -3462,9 +3462,8 @@ export function resolveLibCssFilename(
     return `${libOptions.fileName}.css`
   }
 
-  const packageJson = findNearestPackageData(root, packageCache)?.data
-  const name =
-    packageJson && packageJson.name ? getPkgName(packageJson.name) : undefined
+  const packageJson = findNearestMainPackageData(root, packageCache)?.data
+  const name = packageJson ? getPkgName(packageJson.name) : undefined
 
   if (!name)
     throw new Error(