babel的大概知识点 。
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babel常用的转译器是babel-preset-env。
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常用的配置选项是plugins和presets
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常用的使用场景是在webpack中
https://www.cnblogs.com/lsgxeva/p/7758184.html
补充：
个别配置意义
targets
string | Array<string> | { [string]: string }, defaults to {}.
Describes the environments you support/target for your project.
This can either be a browserslist-compatible query:
modules
"amd" | "umd" | "systemjs" | "commonjs" | "cjs" | "auto" | false, defaults to "auto".
Enable transformation of ES6 module syntax to another module type.
Setting this to false will not transform modules.
Also note that cjs is just an alias for commonjs.