--save 和 --save-dev 有什么区别? [英] What is the difference between --save and --save-dev?

问题描述

有什么区别:

npm install [package_name]

和:

npm install [package_name] --save

和:

npm install [package_name] --save-dev

这是什么意思?--save 和 -dev 关键字的真正作用是什么?

What does this mean? And what is really the effect of --save and -dev keywords?

推荐答案

--save 和 --save-dev 之间的区别可能不会立即引起注意在您自己的项目中尝试过它们.所以这里有几个例子...

The difference between --save and --save-dev may not be immediately noticeable if you have tried them both on your own projects. So here are a few examples...

假设您正在构建一个使用 moment 的应用用于解析和显示日期的包.您的应用程序是一个调度程序，因此它确实需要此程序包才能运行，例如:没有它就无法运行.在这种情况下，您将使用

Let's say you were building an app that used the moment package to parse and display dates. Your app is a scheduler so it really needs this package to run, as in: cannot run without it. In this case you would use

npm install moment --save

这将在您的 package.json 中创建一个新值

This would create a new value in your package.json

"dependencies": {
   ...
   "moment": "^2.17.1"
}

在开发时，使用测试套件等工具确实很有帮助，可能需要 jasmine-核心 和karma.在这种情况下，您将使用

When you are developing, it really helps to use tools such as test suites and may need jasmine-core and karma. In this case you would use

npm install jasmine-core --save-dev
npm install karma --save-dev

这也会在你的 package.json 中创建一个新值

This would also create a new value in your package.json

"devDependencies": {
    ...
    "jasmine-core": "^2.5.2",
    "karma": "^1.4.1",
}

您不需要测试套件以在其正常状态下运行应用程序，因此它是一个 --save-dev 类型的依赖项，仅此而已.你可以看到如果你不了解真正发生的事情，这有点难以想象.

You do not need the test suite to run the app in its normal state, so it is a --save-dev type dependency, nothing more. You can see how if you do not understand what is really happening, it is a bit hard to imagine.

直接取自 NPM 文档 docs#dependencies

Taken directly from NPM docs docs#dependencies

依赖

依赖项在一个映射包名称的简单对象中指定到一个版本范围.版本范围是一个字符串，具有一个或更多以空格分隔的描述符.也可以识别依赖关系使用 tarball 或 git URL.

Dependencies are specified in a simple object that maps a package name to a version range. The version range is a string that has one or more space-separated descriptors. Dependencies can also be identified with a tarball or git URL.

请不要将测试工具或转译器放在您的依赖项中目的.请参阅下面的 devDependencies.

即使在文档中，它也要求您将 --save-dev 用于测试工具等模块.

Even in the docs, it asks you to use --save-dev for modules such as test harnesses.

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