Remove voila-dashboards dependency

Author: martinRenou

packages/widgets-manager/package.json

@@ -43,8 +43,7 @@
     "@jupyterlab/application": "^4.0.0",
     "@jupyterlab/coreutils": "^6.0.5",
     "@jupyterlab/rendermime": "^4.0.0",
-    "@jupyterlab/services": "^7.0.0",
-    "@voila-dashboards/voila": "^0.5"
+    "@jupyterlab/services": "^7.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.10.2",

packages/widgets-manager/src/index.ts

@@ -32,8 +32,6 @@ import {
   IWidgetRegistryData
 } from '@jupyter-widgets/base';
 
-import { VoilaApp } from '@voila-dashboards/voila';
-
 const WIDGET_MIMETYPE = 'application/vnd.jupyter.widget-view+json';
 
 /**
@@ -49,7 +47,7 @@ export const widgetManagerPlugin: JupyterFrontEndPlugin<IJupyterWidgetRegistry>
       app: JupyterFrontEnd,
       rendermime: IRenderMimeRegistry
     ): Promise<IJupyterWidgetRegistry> => {
-      if (!(app instanceof VoilaApp)) {
+      if (app.name !== 'Voila') {
         throw Error(
           'The Voila Widget Manager plugin must be activated in a VoilaApp'
         );
@@ -68,7 +66,7 @@ export const widgetManagerPlugin: JupyterFrontEndPlugin<IJupyterWidgetRegistry>
       }
       const kernel = new KernelConnection({ model, serverSettings });
       const manager = new KernelWidgetManager(kernel, rendermime);
-      app.widgetManager = manager;
+      (app as any).widgetManager = manager;
 
       rendermime.removeMimeType(WIDGET_MIMETYPE);
       rendermime.addFactory(
@@ -95,7 +93,7 @@ export const widgetManagerPlugin: JupyterFrontEndPlugin<IJupyterWidgetRegistry>
 
       return {
         registerWidget: async (data: IWidgetRegistryData) => {
-          const manager = await app.widgetManagerPromise.promise;
+          const manager = await (app as any).widgetManagerPromise.promise;
 
           manager.register(data);
         }

yarn.lock

@@ -5448,7 +5448,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@voila-dashboards/voila@^0.5, @voila-dashboards/voila@workspace:packages/voila":
+"@voila-dashboards/voila@workspace:packages/voila":
   version: 0.0.0-use.local
   resolution: "@voila-dashboards/voila@workspace:packages/voila"
   dependencies:
@@ -5529,7 +5529,6 @@ __metadata:
     "@jupyterlab/rendermime": ^4.0.0
     "@jupyterlab/services": ^7.0.0
     "@jupyterlab/testutils": ^4.0.0
-    "@voila-dashboards/voila": ^0.5
     npm-run-all: ^4.1.5
     rimraf: ^2.6.1
     source-map-loader: ~1.0.2