import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
import path from 'path';

export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      '@': path.resolve(__dirname, 'src'),
    },
  },
  base: '/',
  build: {
    outDir: 'dist',
    emptyOutDir: true,
    // 单个 chunk 体积告警阈值调高，避免大页面触发无意义告警
    chunkSizeWarningLimit: 1200,
    rollupOptions: {
      output: {
        // 仅将 react 核心库单独打包（长期缓存）；
        // 其余第三方库交给 Rollup 自动按需拆分，避免被强制合并成一个大 vendor 在首屏加载
        manualChunks(id) {
          if (id.includes('node_modules')) {
            if (
              id.includes('react-router') ||
              id.includes('/react/') ||
              id.includes('react-dom') ||
              id.includes('scheduler')
            ) {
              return 'react-vendor';
            }
          }
        },
      },
    },
  },
  server: {
    port: 5173,
  },
});