学习Babel之前,先认真阅读下列两份文档
https://github.com/jamiebuilds/babel-handbook/blob/master/translations/zh-Hans/user-handbook.md
https://github.com/jamiebuilds/babel-handbook/blob/master/translations/zh-Hans/plugin-handbook.md
https://github.com/babel/babel/blob/main/packages/babel-parser/ast/spec.md#privatename
https://github.com/estree/estree
babel源代码,可配合vscode进行source-map调试 安装node_modules后,需要讲源码对应的map文件映射到babel-debug目录即可