Gtk.IconTheme.prototype.get_icon_sizes

function get_icon_sizes(icon_name:String):[Number] {
    // Gjs wrapper for gtk_icon_theme_get_icon_sizes()
}

Returns an array of integers describing the sizes at which the icon is available without scaling. A size of -1 means that the icon is available in a scalable format. The array is zero-terminated.

Since 2.6