what means @ version package npm code example

Example 1: npm package version

// How to increment your project version
Ex: 1.0.0

* npm version patch ---> 1.0.1
* npm version minor ---> 1.1.0
* npm version major ---> 2.0.0

npm version [ | major | minor | patch | premajor | 
preminor | prepatch | prerelease [--preid=] | from-git]

Example 2: npm package at version

npm install @