Manual:$wgVueDevelopmentMode

ResourceLoader: $wgVueDevelopmentMode
Whether to use the development version of Vue.js.
Introduced in version:1.35.0 (Gerrit change 569666; git #4c221a1e)
Removed in version:still in use
Allowed values:Unspecified
Default value:false

Details edit

Whether to use the development version of Vue.js. This should be disabled for production installations. For development installations, enabling this provides useful additional warnings and checks.

Even when this is disabled, using ResourceLoader's debug mode (?debug=true) will cause the development version to be loaded.