Web browser: ---
            Bug ID: 59858
           Summary: Difficult to debug LESS compilation errors
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: ResourceLoader
    Classification: Unclassified
   Mobile Platform: ---

If there is a compilation error with the less files, the only exception we get

Warning: array_map(): An error occurred while invoking the map callback in

This is not helpful. Because array maps cannot properly report errors from

Roan already reported this issue at PHP with a patch. but not accepted at upstream.

Can't we modify the code in readStyleFiles of ResourceLoaderFileModule a bit so
that we get sensible stack trace and saves time in debugging?

instead of array map, it can be something like

$style= "";
foreach ( $files as $file  ) {
  $style = $style . "\n".  $this->readStyleFile( $file,  $flip );
$styles[$media] = $style;

What I expect is a helpful error message like:

exception 'Exception' with message '.mw-ui-one-third is undefined: failed at
/home/santhosh/dev/wiki/ContentTranslation/modules/base/styles/base.less on
line 27' in /home/santhosh/dev/wiki/core/includes/libs/

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