Use lumino application directly

package.json

@@ -1,6 +1,6 @@
 {
   "name": "quetz-theme",
-  "version": "0.1.2",
+  "version": "0.2.0",
   "description": "A dark-yellow theme for Quetz.",
   "keywords": [
     "jupyter",
@@ -42,9 +42,8 @@
     "watch:labextension": "jupyter labextension watch ."
   },
   "dependencies": {
-    "@jupyterlab/application": "^3.0.0",
-    "@jupyterlab/apputils": "^3.0.0"
-
+    "@jupyterlab/apputils": "^3.0.0",
+    "@lumino/application": "^1.25.0"
   },
   "devDependencies": {
     "@jupyterlab/builder": "^3.0.0",

src/index.ts

@@ -1,25 +1,22 @@
-import type {
-  JupyterFrontEnd,
-  JupyterFrontEndPlugin,
-} from '@jupyterlab/application';
+import type { IPlugin } from '@lumino/application';
 
 import { IThemeManager } from '@jupyterlab/apputils';
 
 /**
  * Initialization data for the quetz-theme extension.
  */
-const extension: JupyterFrontEndPlugin<void> = {
+const extension: IPlugin<any, void> = {
   id: 'quetz-theme',
   requires: [IThemeManager],
   autoStart: true,
-  activate: (app: JupyterFrontEnd, manager: IThemeManager) => {
+  activate: (app: any, manager: IThemeManager) => {
     const style = 'quetz-theme/index.css';
 
     manager.register({
       name: 'Quetz',
       isLight: false,
       load: () => manager.loadCSS(style),
-      unload: () => Promise.resolve(undefined),
+      unload: () => Promise.resolve(),
     });
   },
 };