Wikipedia:Lua/Modul-Failsafe/en

The Failsafe interface is heading for version management of globally distributed Lua modules. It enables modules equipped with this interface to

• ensure, that a library module required by a template or another module available as local copy does support certain functionality, or complain if not.
• administrate global updating and linking of module codes via Wikidata.

The Failsafe interface is present both at template level and for direct Lua access.

The functions in detail are (not all supported yet completely by every library):

Optional (unnamed) additional parameter

Value	Result
nothing false	local version ID
Minimal version	version ID required at least date in ISO format It will be compared whether the current local implementation matches this version or later. empty, if minimal version not achieved
wikidata	version ID of global upstream version ID at Wikidata local, if not found there
~	Corresponding version ID locally and registered at Wikidata empty, if up to date version ID at Wikidata, if not equal
@	Is the current (module) page linked correctly with Wikidata item? empty, if linked to the item which is supposed Iitem ID, if not
The return value is in template programming empty or under Lua false, otherwis a non-empty string as described.