Feature Request: Lint - unused libnames

[Carus11]

Assigning a Libname adds time to a job, especially when connecting to certain data sources such as Hadoop, snowflake, or other traditionally non-transactional DBMS's.
It would be nice to have a lint feature to detect unused libnames, so that connections are not needlessly opened potentially adding latency to a job.

[allanbowe]

This feature would have a default assumption that a particular .sas program file is a single / complete job

Whereas there are many, many cases where this is not true, eg:

• autoexec.sas might pre-assign librefs
• libraries might only be used in macros, functions, or %included code
• in the case of the SASjs framework (compiled jobs, services & tests) the invocation could be in one of the Secondary Artefacts

A reasonable workaround could be that we could include an 'ignore list' on a per file, or per project basis.

If there is funding, we'd be happy to build the feature - we'd just default it to OFF due to the likely (initial) false positives.