formstream的package.json文件依赖的"mime": "^1.3.4",

[jx168]

安装依赖会安装2.0版本，因为node-mime代码方法名改了
Version 2 is a breaking change from 1.x as the semver implies. Specifically:

lookup() renamed to getType()
extension() renamed to getExtension()
charset() and load() methods have been removed
If you prefer the legacy version of this module please npm install mime@^1. Version 1 docs may be found here.
这样会引发报错
nodejs.TypeError: mime.lookup is not a function
请更新下指定版本