electron-vite-vue/packages/preload/vite.config.ts

import { builtinModules } from 'module'
import { defineConfig } from 'vite'
import pkg from '../../package.json'

export default defineConfig({
  root: __dirname,
  build: {
    outDir: '../../dist/preload',
    lib: {
      entry: 'index.ts',
      formats: ['cjs'],
      fileName: () => '[name].cjs',
    },
    sourcemap: true,
    minify: process.env./* from mode option */NODE_ENV === 'production',
    emptyOutDir: true,
    rollupOptions: {
      external: [
        'electron',
        ...builtinModules,
        ...Object.keys(pkg.dependencies || {}),
      ],
    },
  },
})