Yii2 How to include libraries that are not on packagist?

Question

Yii

Let's say there is some API wrapper with code on github.
Not available on packagist, I can't connect it via composer.
I see two ways:
1. Fork and add to packagist
2. Create a folder with libraries in the application (similar to vendor) and throw a class there, prescribing the necessary namespaces.
What method do you use?
Are there other ways?

Answer 1

Let's say there is some API wrapper with code on github.
Not available on packagist, I can't connect it via composer.

what are you saying .... RTFM