perf(externalizeDepsPlugin): use cached package data to improve performance

src/plugins/externalizeDeps.ts

@@ -1,6 +1,5 @@
-import path from 'node:path'
-import { createRequire } from 'node:module'
 import { type Plugin, mergeConfig } from 'vite'
+import { loadPackageData } from '../utils'
 
 export interface ExternalOptions {
   exclude?: string[]
@@ -13,9 +12,7 @@ export interface ExternalOptions {
 export function externalizeDepsPlugin(options: ExternalOptions = {}): Plugin | null {
   const { exclude = [], include = [] } = options
 
-  const packagePath = path.resolve(process.cwd(), 'package.json')
-  const require = createRequire(import.meta.url)
-  const pkg = require(packagePath)
+  const pkg = loadPackageData() || {}
   let deps = Object.keys(pkg.dependencies || {})
 
   if (include.length) {

src/utils.ts

@@ -53,6 +53,7 @@ export function loadEnv(
 interface PackageData {
   main?: string
   type?: 'module' | 'commonjs'
+  dependencies?: Record<string, string>
 }
 
 let packageCached: PackageData | null = null
@@ -65,7 +66,8 @@ export function loadPackageData(root = process.cwd()): PackageData | null {
     const data = _require(pkg)
     packageCached = {
       main: data.main,
-      type: data.type
+      type: data.type,
+      dependencies: data.dependencies
     }
     return packageCached
   }