Gtk.Widget.prototype.get_modifier_style

function get_modifier_style():Gtk.RcStyle {
    // Gjs wrapper for gtk_widget_get_modifier_style()
}

Returns the current modifier style for the widget. (As set by Gtk.modify_style.) If no style has previously set, a new Gtk.RcStyle will be created with all values unset, and set as the modifier style for the widget. If you make changes to this rc style, you must call Gtk.modify_style, passing in the returned rc style, to make sure that your changes take effect.

Caution: passing the style back to Gtk.modify_style will normally end up destroying it, because Gtk.modify_style copies the passed-in style and sets the copy as the new modifier style, thus dropping any reference to the old modifier style. Add a reference to the modifier style if you want to keep it alive.