为什么npm在package.json中添加一些带下划线的属性

Question

当我执行npm install koa-compose时，npm会自动添加一些带下划线的属性，它们有什么作用？像这样：

{
  "_args": [
    [
      "koa-compose",
      "/Users/keenwon/Desktop/demo"
    ]
  ],
  "_from": "koa-compose@latest",
  "_id": "koa-compose@2.4.0",
  "_inCache": true,
  "_installable": true,
  "_location": "/koa-compose",
  "_nodeVersion": "5.7.0",
  "_npmVersion": "3.7.5",
  "_phantomChildren": {},
  "_spec": "koa-compose",
  "_where": "/Users/keenwon/Desktop/demo"
  "version": "2.4.0"
}

Answer 1

这是What are these properties prefixing underscore used for in package.json?的副本 答案：https://stackoverflow.com/a/42625703/6307425

  

这些是为包注册表保留的元数据。所有以_或$开头的属性都保留给包注册表以供其自行决定使用。 wiki常见的“保留属性”部分解释了它。