How to use a package pulled by npm manager?

Question

JavaScript

Good afternoon, ladies and gentlemen.
Please help me get things up and running. How do I install the package after I installed the package manager and pulled the npm package install vue.js
If before I used Vue JS by creating an assets folder in js and specifying src directly. Or even resorted to CDN.
But now there are a lot of packages and I began to transfer packages to the npm manager.
But I can't figure out how to upload them.
What's under my hood:
PHP(CodeIgniter)

Answer 1

each package has its own `package.json` which contains the "main" file.
And when you import some library from node_modules without specifying the path, then this main file will be imported.