node.js - npm 依赖项安装，困惑

Question

我安装了两套node.js/npm，一套是1.4.28，一套是3.1.0

通过使用包含以下内容的 package.json 文件部署相同的应用程序:

    {
  "name": "server",
  "version": "0.0.1",
  "description": "js server",
  "dependencies": {
    "async": "^1.3.0",
    "aws-sdk": "^2.1.36",
    "body-parser": "^1.13.2",
    "ejs": "^2.3.2",
    "express": "^4.13.1",
    "generic-pool": "^2.2.0",
    "multer": "^0.1.8",
    "mysql": "^2.7.0",
    "node-uuid": "^1.4.3",
    "nodemailer": "^1.4.0",
    "nodemailer-smtp-transport": "^1.0.3",
    "password-hash-and-salt": "^0.1.2",
    "pm2": "^0.14.3",
    "redis": "^0.12.1",
    "redis-sessions": "^0.3.9",
    "request": "^2.58.0",
    "socket.io": "^1.3.5",
    "winston": "^1.0.1",
    "yauzl": "^2.3.1"
  }
}

在版本 1.4.28 上，在没有任何 node_modules 目录的全新安装上运行 npm install 后，如果填充了正确的所需模块:

在 3.1.0 版本上，我得到了大量在我看来不需要的从属依赖项:

所以任何人都可以向我解释发生了什么事以及为什么我让所有这些部门都参与其中？我也尝试过在 npm 上使用 --product ，但没有成功......

非常感谢!

Answer 1

这是新的 npm 3.* 功能。来自 npm blog :

With npm@3, your node_modules directory will be a lot flatter. All of your dependencies and most of your subdependencies (and (sub)+dependencies) will be sitting next to each other at the top level. Only when there are conflicts will modules be installed at deeper levels. This should make things a lot easier for Windows users.