Details

Extensions can register foreign module sources here. The default "local" source for modules from the local wiki is not set in this array. Instead that one is defined by ResourceLoader::__construct() so that it cannot be unset or overwritten.

Example:

$wgResourceLoaderSources['foo'] = array(
    'loadScript' => 'http://example.org/w/load.php',
    'apiScript' => 'http://example.org/w/api.php'
);