Manual:$wgIncludeLegacyJavaScript

Languages:

This feature was removed completely in version 1.39.0.

ResourceLoader: $wgIncludeLegacyJavaScript
Whether to include the mediawiki.legacy JavaScript library (old wikibits.js), and its dependencies.
Introduced in version:	1.17.0 (r83173)
Deprecated in version:	1.26.0 (Gerrit change 229594; git #0ac4f998)
Removed in version:	1.39.0 (Gerrit change 831217; git #a3cb9d53)
Allowed values:	(boolean)
Default value:	`false` (MW 1.27+) `true` (MW 1.17-1.26)
Other settings: Alphabetical \| By function

Details[edit]

Whether to include the mediawiki.legacy JavaScript library (old wikibits.js), and its dependencies.