Manual:$wgResourceLoaderMinifierStatementsOnOwnLine

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ResourceLoader: $wgResourceLoaderMinifierStatementsOnOwnLine
Put each statement on its own line when minifying JavaScript.
Introduced in version:1.17.0 (r83891)
Deprecated in version:1.27.0 (Gerrit change 242719; git #b91643ff)
Removed in version:1.31.0 (Gerrit change 394497; git #I6689274)
Allowed values:(boolean)
Default value:false

Details[edit]

Put each statement on its own line when minifying JavaScript. This makes debugging in non-debug mode a bit easier.