extensions-tool: Adjust templates

Extensions are now loaded as modules, so adjust the templates
accordingly.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2795>

.eslintrc.yml

@@ -7,5 +7,6 @@ overrides:
       - js/dbusServices/**
       - js/portalHelper/**
       - subprojects/extensions-app/**
+      - subprojects/extensions-tool/**
     parserOptions:
       sourceType: module

subprojects/extensions-tool/src/templates/indicator/extension.js

@@ -16,12 +16,10 @@
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-/* exported init */
-
 const GETTEXT_DOMAIN = 'my-indicator-extension';
 
-const GObject = imports.gi.GObject;
-const St = imports.gi.St;
+import GObject from 'gi://GObject';
+import St from 'gi://St';
 
 const ExtensionUtils = imports.misc.extensionUtils;
 const Main = imports.ui.main;
@@ -48,9 +46,9 @@ class Indicator extends PanelMenu.Button {
     }
 });
 
-class Extension {
-    constructor(uuid) {
-        this._uuid = uuid;
+export default class Extension {
+    constructor(metadata) {
+        this._uuid = metadata.uuid;
 
         ExtensionUtils.initTranslations(GETTEXT_DOMAIN);
     }
@@ -65,7 +63,3 @@ class Extension {
         this._indicator = null;
     }
 }
-
-function init(meta) {
-    return new Extension(meta.uuid);
-}

subprojects/extensions-tool/src/templates/plain/extension.js

@@ -16,9 +16,7 @@
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-/* exported init */
-
-class Extension {
+export default class Extension {
     constructor() {
     }
 
@@ -28,7 +26,3 @@ class Extension {
     disable() {
     }
 }
-
-function init() {
-    return new Extension();
-}