如果未使用Shell脚本安装，则安装NPM软件包

Question

I want to write a shell script to install NPM package if not already installed.

I can use the command npm info <package-name> version to get information about the package. It gives me the version if it is already there

2.0.0

If it is not there it gives an error.

npm ERR! code E404
npm ERR! 404 Not found :<package>
npm ERR! 404 
npm ERR! 404  '<package>' is not in the npm registry.

How can I use this result in a conditional block to do some task depending on it?

Answer 1

I think you're over-complicating things. npm-install already checks if the module is installed and just ignores it if it's already there, so all you need to do is call it:

$ npm install mymodule@2.0.0