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- 预构建
- 把非ESM模式的代码。转换成ESM格式，在浏览器通过`<script type="module"></script>` 的方式能正确加载
- 打包第三方库的代码，将各个第三方库的分散文件合并到一起，减少HTTP请求数量，避免页面加载性能劣化