Manual:$wgResourceLoaderValidateStaticJS

Resource loader: $wgResourceLoaderValidateStaticJS
Whether to parse statically-sourced (file-backed) JavaScript resources prior to minification to validate them.
Introduced in version:	1.18.0 (r91914)
Removed in version:	still in use
Allowed values:	boolean
Default value:	false

Other settings: Alphabetical | By Function

Details

If set to true, statically-sourced (file-backed) JavaScript resources will be parsed for validity before being bundled up into ResourceLoader modules.

This can be helpful for development by providing better error messages in default (non-debug) mode, but JavaScript parsing is slow and memory hungry and may fail on large pre-bundled frameworks.