Manual:$wgResourceLoaderSources

ResourceLoader: $wgResourceLoaderSources
Foreign module sources registry.
Introduced in version:	1.19.0 (r93247)
Removed in version:	still in use
Allowed values:	(array)
Default value:	[]
Other settings: Alphabetical | By function

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'
);