I'm imaging you might be coming from an ecosystem like perl and cpan, or python and pip. SAS is not like other languages and systems where developers have very fine grained control of exactly which features are imported into their program. SAS Foundation is very much an everything and the kitchen sink affair. To find out what you get with it the simplest thing to look at is the procedures guide and look in the Base SAS section here.
What is the problem you are actually trying to solve? Are you attempting to package the software for a desktop system? If you are the simplest thing is deploying everything that is licensed. Yes, a SAS installation is big, but hard disk space is now at a point where a deployment of SAS takes less than a $1 worth of hard disk space so trying to optimize what you do and don't deploy is not going to be something worth spending time on.
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