vite.config.ts

import { fileURLToPath, URL } from 'node:url';
import { resolve } from 'path';

import { defineConfig } from 'vite';
// import legacy from '@vitejs/plugin-legacy';
import vue2 from '@vitejs/plugin-vue2';
import vue2Jsx from '@vitejs/plugin-vue2-jsx';

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    vue2(),
    vue2Jsx(),
    // legacy({
    //   targets: ['ie >= 11'],
    //   additionalLegacyPolyfills: ['regenerator-runtime/runtime'],
    // }),
  ],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url)),
    },
  },
  build: {
    minify: 'terser',
    target: 'esnext',
    lib: {
      // Could also be a dictionary or array of multiple entry points
      entry: resolve(__dirname, 'src/index.ts'),
      name: 'VirtualTree',
      // the proper extensions will be added
      fileName: 'virtual-tree',
    },
    terserOptions: {
      compress: true,
      mangle: true,
    },
    rollupOptions: {
      // 确保外部化处理那些你不想打包进库的依赖
      external: ['vue'],
      output: {
        // 在 UMD 构建模式下为这些外部化的依赖提供一个全局变量
        globals: {
          vue: 'Vue',
        },
      },
    },
  },
});