webpack-dev-server 的 webpack-dev-middleware 引用了 memory-fs 来替代 fs，避免重复读写磁盘。
https://github.com/webpack/webpack
https://github.com/webpack/webpack-dev-server
https://github.com/webpack/webpack-dev-middleware
https://github.com/webpack/memory-fs
示例
https://code.aliyun.com/tii/memory-fs-startup?spm=a2111a.8458726.0.0.6c6c353175YpDm
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