Add missing singleton packages for RTC (#6816)

* Add missing singleton packages for RTC

* Add RTC screencast to the docs

* try fix package check

app/package.json

@@ -10,6 +10,8 @@
     "watch": "webpack --config ./webpack.config.watch.js"
   },
   "resolutions": {
+    "@codemirror/state": "~6.2.0",
+    "@codemirror/view": "~6.9.3",
     "@jupyter-notebook/application": "~7.0.0-alpha.18",
     "@jupyter-notebook/application-extension": "~7.0.0-alpha.18",
     "@jupyter-notebook/console-extension": "~7.0.0-alpha.18",
@@ -90,6 +92,8 @@
     "@jupyterlab/ui-components": "~4.0.0-beta.0",
     "@jupyterlab/ui-components-extension": "~4.0.0-beta.0",
     "@jupyterlab/vega5-extension": "~4.0.0-beta.0",
+    "@lezer/common": "~1.0.2",
+    "@lezer/highlight": "~1.1.4",
     "@lumino/algorithm": "~2.0.0",
     "@lumino/application": "~2.0.1",
     "@lumino/commands": "~2.0.1",
@@ -318,6 +322,8 @@
       }
     },
     "singletonPackages": [
+      "@codemirror/state",
+      "@codemirror/view",
       "@jupyter-notebook/tree",
       "@jupyter/ydoc",
       "@jupyterlab/application",
@@ -352,6 +358,8 @@
       "@jupyterlab/tooltip",
       "@jupyterlab/translation",
       "@jupyterlab/ui-components",
+      "@lezer/common",
+      "@lezer/highlight",
       "@lumino/algorithm",
       "@lumino/application",
       "@lumino/commands",

buildutils/src/ensure-repo.ts

@@ -18,10 +18,19 @@ function ensureResolutions(): string[] {
     corePackage.jupyterlab.singletonPackages
   );
 
-  packages.forEach((name) => {
-    const data = require(`${name}/package.json`);
+  packages.forEach(async (name) => {
+    let version = '';
+    try {
+      const data = require(`${name}/package.json`);
+      version = data.version;
+    } catch {
+      const modulePath = require.resolve(name);
+      const parentDir = path.dirname(path.dirname(modulePath));
+      const data = require(path.join(parentDir, 'package.json'));
+      version = data.version;
+    }
     // Insist on a restricted version in the yarn resolution.
-    corePackage.resolutions[name] = `~${data.version}`;
+    corePackage.resolutions[name] = `~${version}`;
   });
 
   // Write the package.json back to disk.

docs/source/notebook_7_features.md

@@ -35,6 +35,8 @@ After installing the extension, restart the Jupyter Server so the extension can
 It is possible for two users to work on the same notebook using Notebook 7 or JupyterLab.
 ```
 
+![a screencast showing how users can collaborate on the same document with both Notebook 7 and JupyterLab](https://user-images.githubusercontent.com/591645/229854102-6eed73f4-587f-406e-8ed1-347b788da9ee.gif)
+
 ## Table of Contents
 
 Notebook 7 includes a new table of contents extension that allows you to navigate through your notebook using a sidebar. The Table of Contents is built-in and enabled by default, just like in JupyterLab.