node.js 如何在 package.json 中使用变量？
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How can I use variables in package.json?
提问by husayt
There is a feature from maven I miss a lot in package.json. In maven .pom file you can define variables in parent project and use them in child project's pom files.
有一个来自 maven 的特性，我在 package.json 中非常想念。在 maven .pom 文件中，您可以在父项目中定义变量并在子项目的 pom 文件中使用它们。
Is there something like this in npm? We are building modular project and I want to define dependency versions centrally and them to be used in respective package.json files.
npm 中有这样的东西吗？我们正在构建模块化项目，我想集中定义依赖版本，并在相应的 package.json 文件中使用它们。
Thanks
谢谢
回答by Abhay
Any key can be referenced, beginning with $npm_package_and adding an underscore for every level you go down.
可以引用任何键，开始$npm_package_并为您下降的每个级别添加下划线。
Example:
例子：
{ "name": "appname", "version": "0.0.1"}
name can be access like: $npm_package_nameor ${npm_package_name}to delimit within string
名称可以像这样访问：$npm_package_name或${npm_package_name}在字符串中分隔
For windows user, name can access like: %npm_package_name%
对于 Windows 用户，名称可以访问如下： %npm_package_name%
回答by Jirik
Define a config object in package.json:
在 package.json 中定义一个配置对象：
{
"name" : "myapp",
"config" : { "port" : "3000" },
...
}
And then you can access port value from scrips object with $npm_package_config_port
然后你可以从脚本对象访问端口值 $npm_package_config_port
{
"name" : "myapp",
"config" : { "port" : "3000" },
"scripts": {
"start" : "node --harmony app.js $npm_package_config_port"
},
...
}
The source full article is here:
源完整文章在这里：
http://www.marcusoft.net/2015/08/npm-scripting-configs-and-arguments.html#npm-configuration
http://www.marcusoft.net/2015/08/npm-scripting-configs-and-arguments.html#npm-configuration
Here is another example:
这是另一个例子：
回答by Renan Gomes
On Windows, you should use %variable_name%. For example:
在 Windows 上，您应该使用%variable_name%. 例如：
{
"name": "app_name",
"version": "1.0.0",
"custom": {
"key": "any value"
}
}
You can get it using %npm_package_name%, %npm_package_version%and %npm_package_custom_key%.
您可以使用%npm_package_name%,%npm_package_version%和来获取它%npm_package_custom_key%。
