If I want to copy a node project: Does it make any difference if I just copy node_modules or install all the modules again from scratch via npm?
如果我想复制节点项目：如果我只是复制node_modules或通过npm从头开始再次安装所有模块，它会有什么不同吗？
1 个解决方案
#1
11
2017-05-12
I've updated this answer to reflect changes since the release of npm 3.x and new tools that are available.
我已经更新了这个答案，以反映自npm 3.x发布以来可用的新工具的变化。
npm v3 dependency installation is now non-deterministic meaning you may get different packages depending on the order in which packages have been installed over time. This isn't necessarily a bad thing, just something to be aware of.
npm v3依赖项安装现在是非确定性的，这意味着您可能会获得不同的软件包，具体取决于软件包随时间安装的顺序。这不一定是坏事，只是需要注意的事情。
Given this change I personally don't copy my node_modules directory around too much (it's still possible though!) and instead opt for a clean install most of the time.
鉴于这种变化，我个人不会过多地复制我的node_modules目录（虽然它仍然可以！）而是大多数时候选择干净安装。
There are new tools like Yarn Package Manager which can speed up the installation process if you are doing that a lot (but as of 2017-05-12 it's unclear how well it handles private npm organisations and private scoped packages).
有一些新的工具，比如Yarn Package Manager，如果你做了很多事情，可以加快安装过程（但是从2017-05-12开始，还不清楚它处理私有npm组织和私有范围包的程度如何）。
So the takeaway is still pretty much the same: it won't hurt, but maybe err on the side of a clean install. If something weird does happen and you run into problems then you can just delete node_modules and run npm install.
所以外卖仍然几乎相同：它不会受到伤害，但可能在干净安装方面犯错。如果确实发生了奇怪的事情而你遇到了问题，那么你可以删除node_modules并运行npm install。
Original answer from 2014-06-08:
In general it should be fine - I copy the node_modules directory sometimes from my other projects to speed up the setup process.
一般情况下应该没问题 - 我有时会从其他项目中复制node_modules目录以加快设置过程。
You can always copy node_modules and then run npm install or npm update in the new project to make sure you've got up-to-date versions. npm will use the files in node_modules as a cache and should only bring down newer content if required.
您始终可以复制node_modules，然后在新项目中运行npm install或npm update，以确保您拥有最新版本。 npm将使用node_modules中的文件作为缓存，并且只应在需要时关闭较新的内容。
In short: it won't hurt. If something weird does happen and you run into problems then you can just delete node_modules and run npm install.
简而言之：它不会受到伤害。如果确实发生了奇怪的事情而你遇到了问题，那么你可以删除node_modules并运行npm install。
#1
11
2017-05-12
I've updated this answer to reflect changes since the release of npm 3.x and new tools that are available.
我已经更新了这个答案，以反映自npm 3.x发布以来可用的新工具的变化。
npm v3 dependency installation is now non-deterministic meaning you may get different packages depending on the order in which packages have been installed over time. This isn't necessarily a bad thing, just something to be aware of.
npm v3依赖项安装现在是非确定性的，这意味着您可能会获得不同的软件包，具体取决于软件包随时间安装的顺序。这不一定是坏事，只是需要注意的事情。
Given this change I personally don't copy my node_modules directory around too much (it's still possible though!) and instead opt for a clean install most of the time.
鉴于这种变化，我个人不会过多地复制我的node_modules目录（虽然它仍然可以！）而是大多数时候选择干净安装。
There are new tools like Yarn Package Manager which can speed up the installation process if you are doing that a lot (but as of 2017-05-12 it's unclear how well it handles private npm organisations and private scoped packages).
有一些新的工具，比如Yarn Package Manager，如果你做了很多事情，可以加快安装过程（但是从2017-05-12开始，还不清楚它处理私有npm组织和私有范围包的程度如何）。
So the takeaway is still pretty much the same: it won't hurt, but maybe err on the side of a clean install. If something weird does happen and you run into problems then you can just delete node_modules and run npm install.
所以外卖仍然几乎相同：它不会受到伤害，但可能在干净安装方面犯错。如果确实发生了奇怪的事情而你遇到了问题，那么你可以删除node_modules并运行npm install。
Original answer from 2014-06-08:
In general it should be fine - I copy the node_modules directory sometimes from my other projects to speed up the setup process.
一般情况下应该没问题 - 我有时会从其他项目中复制node_modules目录以加快设置过程。
You can always copy node_modules and then run npm install or npm update in the new project to make sure you've got up-to-date versions. npm will use the files in node_modules as a cache and should only bring down newer content if required.
您始终可以复制node_modules，然后在新项目中运行npm install或npm update，以确保您拥有最新版本。 npm将使用node_modules中的文件作为缓存，并且只应在需要时关闭较新的内容。
In short: it won't hurt. If something weird does happen and you run into problems then you can just delete node_modules and run npm install.
简而言之：它不会受到伤害。如果确实发生了奇怪的事情而你遇到了问题，那么你可以删除node_modules并运行npm install。