Motivation

Add the publicOnly option from require-jsdoc to other rules.
Personally I want to require jsdoc for all top-level functions for the types and only require descriptions when the functions are exported.
I am willing to create a PR for this functionality.

Current behavior

Currently only the rule require-jsdoc has the option publicOnly

Desired behavior

Add the same option to other rules. I would add them to require-description, require-param-description and require-returns-description.

Alternatives considered

This could also be a new rule as otherwise many other rules would be modified.
This new rule has a list of tag names requiring a description as an option.

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