Manual:$wgResourceLoaderValidateStaticJS

ResourceLoader: $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:1.32.0 (Gerrit change 454081; git #3bd1910f)
Allowed values:(boolean)
Default value:false

Details

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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.