Jdlrobson added a comment.

  The frontend stable policy currently doesn't cover mw.config values. We 
already have cases where config variables are not always available e.g. on 
mobile wgCategories is notably absent, so I think code should be providing 
fallbacks or error handling when those don't exist. e.g. 
`mw.config.get('wgCategories', [] ) ` or `if  (mw.config.get('wgCategories') 
=== null ) return;`
  
  I think this would be a good thing to clarify in the policy - so would 
encourage you to propose text via the talk page 
(https://www.mediawiki.org/wiki/Talk:Stable_interface_policy/Frontend) that 
makes sense for your team relating to the lack of stability of config variables 
to make this clearer!

TASK DETAIL
  https://phabricator.wikimedia.org/T348079

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To: Jdlrobson
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