如何编写 package.json 文件，以便使用“npm install"下载所有依赖项

问题描述

我使用 node.js 编写了一个简单的应用程序.这取决于 express、mongodb 和 mongoose(简单).因此，我创建了一个名为 package.json 的文件并将其放入其中:

I wrote a simple application using node. It depends on express, mongodb and mongoose (easy).So, I created a file called package.json and put this in it:

{
  "name": "booking-dojo",
  "description": "Booking dojo app",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "express": "3.x",
    "mongodb": "*",
    "mongoose": "*"
  }
}

然后我运行 npm install，期望 npm 安装这些模块和它们的依赖项.结果令人失望:

I then ran npm install, expecting npm to install those modules and their dependencies.The result was disappointing:

[email protected] /home/merc/Synced/Development/Bookings/app/server
├─┬ [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ ├── [email protected]
│ │ ├── [email protected]
│ │ ├── [email protected]
│ │ └── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ └─┬ [email protected]
│   └── [email protected]
├─┬ [email protected]
│ └── [email protected]
└─┬ [email protected]
  ├── [email protected]
  └── [email protected]

我对此感到困惑，因为我知道express需要jade(以及更多)和mongoose 需要 mongodb.
如果我进入 node_modules/jade 并运行 npm install，主树的结果非常不同:

I am confused by this, as I know that express needs jade (and much more), and mongoose needs mongodb.
If I go into node_modules/jade and run npm install, the result from the main tree is very different:

[email protected] /home/merc/Synced/Development/Bookings/app/server
├─┬ [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ ├── [email protected]
│ │ ├── [email protected]
│ │ ├── [email protected]
│ │ └── [email protected]
│ ├─┬ [email protected]
│ │ └─┬ [email protected]
│ │   └── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ ├── [email protected]
│ │ ├── [email protected]
│ │ └─┬ [email protected]
│ │   └── [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected]
│ ├── [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected]
│ └─┬ [email protected]
│   └─┬ [email protected]
│     ├── [email protected]
│     ├── [email protected]
│     ├── [email protected]
│     └── [email protected]
├─┬ [email protected]
│ └── [email protected]
└─┬ [email protected]
  ├── [email protected]
  └── [email protected]

所以，express成长很多.看起来npm install 只是加载一些 子模块的依赖项.

So, express has grown a lot. It looks like npm install is only loading some of the dependencies of the sub-modules.

有人可以对此有所了解吗?为什么缺少某些依赖项?难道我做错了什么?(可能)

Can somebody please shed some light on this? Why are some dependencies missing? Am I doing something wrong? (likely)

谢谢！

佣兵.

推荐答案

答案由 Brandon 在对另一个答案的评论中提供:

The answer was provided by Brandon in a comment to another answer:

"另一件需要注意的事情是，如果一个包依赖一个可以在依赖链中进一步解析的模块，它会.例如，因为你的 package.json 中有 mongodb，Mongoose 不需要安装自己的 mongodb. – Brandon Tilley 2 天前

"Another thing to note is that if a package depends on a module that can be resolved further up in the dependency chain, it will. For example, since you have mongodb in your package.json, Mongoose doesn't need to install its own mongodb. – Brandon Tilley 2 days ago

谢谢布兰登！(这就是答案...)

Thank you Brandon! (And this is the answer...)

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