Change imports to support gnome45 in extension.js

extension.js

@@ -16,13 +16,20 @@
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-const { Clutter, Gio, GLib, GObject, Meta, Shell, St } = imports.gi;
+import Clutter from 'gi://Clutter';
+import Gio from 'gi://Gio';
+import GLib from 'gi://GLib';
+import GObject from 'gi://GObject';
+import Meta from 'gi://Meta';
+import Shell from 'gi://Shell';
+import St from 'gi://St';
 
 const ExtensionUtils = imports.misc.extensionUtils;
-const Me = ExtensionUtils.getCurrentExtension();
-const Main = imports.ui.main;
-const MessageTray = imports.ui.messageTray.MessageTray;
-const Utils = Me.imports.utils;
+import {Extension} from 'resource:///org/gnome/shell/extensions/extension.js';
+import * as Main from 'resource:///org/gnome/shell/ui/main.js';
+import MessageTray from 'resource:///org/gnome/shell/ui/messageTray.js';
+import * as Utils from './utils.js';
+
 const BannerBin = Main.messageTray._bannerBin;
 const { NOTIFICATION_TIMEOUT, HIDE_TIMEOUT, LONGER_HIDE_TIMEOUT, IDLE_TIME, State, Urgency } = imports.ui.messageTray;
 
@@ -153,14 +160,14 @@ const always_minimize_patch = {
     patch: "// always minimized setting enabled by notification-banner-reloaded ... this._expandBanner(true)",
 };
 
-class Extension {
+export default class NotificationExtension extends Extension {
     constructor() {
         this._previous_y_align = BannerBin.get_y_align();
         this._previous_x_align = BannerBin.get_x_align();
     }
 
     _loadSettings() {
-        this._settings = ExtensionUtils.getSettings();
+        this._settings = this.getSettings();
         this._settingsChangedId = this._settings.connect('changed', this._onSettingsChange.bind(this));
         this._fetchSettings();
     }