How to open directory?

Desktop
,
1

Something like
xdg-open path
Gio.open(path)

2

There is not enough information.

Please explain what you’re trying to achieve.

3 
export var imagePath = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_PICTURES);

const menu_browse = new PopupMenu.PopupImageMenuItem('Browse', 'folder-directory-symbolic', {});
menu_browse.connect('activate', () => {
    //FIX ME
    //xdg-open $imagePath
});
this._indicator.menu.addMenuItem(menu_browse);
4

You can use gtk_file_dialog_set_initial_folder().

Refer:

5

File chooser dialog is not open action.

6

The example reads more like gnome-shell extension code, so using gtk would be wrong. For gnome-shell this is what is usually done:

Gio.app_info_launch_default_for_uri(imagePath, global.create_app_launch_context(0, -1));
7

Uri need ‘file://’ scheme

let uri = 'file://' + imagePath;
Gio.app_info_launch_default_for_uri(uri, global.create_app_launch_context(0, -1));