在 node 端使用 babel 运行编译某个文件夹下所有js文件到某个指定文件夹。
在使用 babel 来 Compile Directories 时，可以使用 --out-dir 或者 -d 参数。
例如，我们要编译 src 文件夹下所有的js文件，并输出到 lib 文件夹下，则可以执行：
babel src --out-dir lib
# 或者
babel src -d lib
这是通过 babel-cli 来运行的。如果需要在 node 端调用编译某个文件，可以安装 babel-core，并使用其提供的 babel.transform 等 api。但是这种方式如果处理某个文件夹下所有的文件的编译，则十分不方便，因此本项目就是为了解决这种场景。
FAQs
compile directories by babel using in node
The npm package babel-d receives a total of 8 weekly downloads. As such, babel-d popularity was classified as not popular.
We found that babel-d demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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