Manual:$wgExtensionMessagesFiles

Note that this is not deprecated for listing files other than those used for messages (such as ).

Details
Associative array mapping extension name to the filename where messages can be found.

The file must create a variable called  .

Example:

Changed behavior in MediaWiki 1.23
Since MediaWiki 1.23, use of this variable to define messages is discouraged; instead, store messages in JSON format and use  .

For setting other variables than  ,   should still be used.

If there is an entry in   with the same key as one in  , then any   variables set in the   file will be ignored.

This means an extension that only provides messages can be backwards compatible by using both <tvar|ExtensionMessagesFiles> </> and <tvar|MessagesDirs> </>, and only one of the two will be used depending on what the version of MediaWiki supports.