In JSDoc comments for Wikimedia codebases, the convention is to use @method instead of @function.

To do:

1. In the mw.widgets.TitleWidget.js file, replace @function with @method in line 92
2. In the mediawiki.requestIdleCallback.js file, replace @function with @method in line 40
3. Run npm install grunt and grunt lint, and ensure that no JSDoc warnings are reported for either of these file