We are trying to limit JS editing to as few accounts as possible to reduce the likelihood of XSS compromises (T190015); configuration should be moved to JSON files to remain widely available for editing. There is no way currently to load a JSON page with ResourceLoader though; loading with AJAX has suboptimal performance. There should be a more efficient way to load such files.
One concrete use case is [[https://en.wikipedia.org/wiki/MediaWiki:Gadget-geonotice-list.js|the geonotice config]] on enwiki; this should be moved to JSON but loading it blocks banner display so performance is key.
### Current method
```lang=js
$.getJSON( mw.util.getUrl( 'MediaWiki:Citoid-template-type-map.json', { action: 'raw' } ) ).then( function ( data ) {
console.log( 'The data is:', data );
} );
```