[WIP] Extension chain

.gitignore

@@ -9,3 +9,4 @@ lib
 dist
 tsconfig.tsbuildinfo
 .vscode
+.wrapper

md_package/src/index.ts

@@ -24,6 +24,10 @@ import { ISettingRegistry } from '@jupyterlab/settingregistry';
 
 import { PathExt } from '@jupyterlab/coreutils';
 
+declare var require: any;
+const IMiddleToken = require('@jupyterlab/example-federated-middle').IMiddleToken as any;
+
+
 /**
  * The command IDs used by the markdownviewer plugin.
  */
@@ -43,7 +47,7 @@ const FACTORY = 'Markdown Preview (Federated)';
 const plugin: JupyterFrontEndPlugin<void> = {
     activate,
     id: '@jupyterlab/example-federated-md:plugin',
-    requires: [ILayoutRestorer, IRenderMimeRegistry, ISettingRegistry],
+    requires: [ILayoutRestorer, IRenderMimeRegistry, ISettingRegistry, IMiddleToken],
     autoStart: true
 };
 
@@ -54,8 +58,11 @@ function activate(
     app: JupyterFrontEnd,
     restorer: ILayoutRestorer,
     rendermime: IRenderMimeRegistry,
-    settingRegistry: ISettingRegistry
+    settingRegistry: ISettingRegistry,
+    middleToken: typeof IMiddleToken
 ): void {
+    console.log('got middle token', middleToken);
+
     const { commands, docRegistry } = app;
 
     // Add the markdown renderer factory.

webpack.config.ext.js

@@ -35,12 +35,16 @@ outputPath = path.join(packagePath, outputPath);
 let extEntry = data.jupyterlab.extension || data.jupyterlab.mimeExtension;
 const index = require.resolve(packagePath);
 const exposes = {
-  './index': index,
   './extension': index
 }
 
+// TODO
+// Try and wrap the export so we're exposing something in our own package
+
+let extensionImport = data['name'];
 if (extEntry !== true) {
   exposes['./extension'] = path.join(packagePath, extEntry);
+  extensionImport = path.join(extensionImport, extEntry);
 }
 
 const coreData = require('./core_package/package.json');
@@ -60,6 +64,9 @@ Object.keys(data.dependencies).forEach((element) => {
   shared[element].requiredVersion = data.dependencies[element];
 });
 
+// Add the package itself.
+shared[data.name] = { requiredVersion: '~' + data.version };
+
 // Remove non-shared.
 (data.jupyterlab.nonSharedPackages || []).forEach((element) => {
   delete shared[element];
@@ -99,13 +106,26 @@ const extras = Build.ensureAssets({
   output: outputPath
 });
 
-fs.copyFileSync(path.join(packagePath, 'package.json'), path.join(outputPath, 'package.orig.json'))
+fs.copyFileSync(path.join(packagePath, 'package.json'), path.join(outputPath, 'package.orig.json'));
+
+// Create the wrapper package
+const wrapper = path.join(packagePath, '.wrapper');
+if (fs.existsSync(wrapper)) {
+  fs.rmdirSync(wrapper, { recursive: true });
+}
+fs.mkdirSync(wrapper);
 
-// Make a bootstrap entrypoint
-const entryPoint = path.join(outputPath, 'bootstrap.js');
-const bootstrap = 'import("' + exposes['./extension'] + '");'
+// Make a bootstrap entrypoint file
+const entryPoint = path.join(wrapper, 'bootstrap.js');
+const bootstrap = 'import("' + extensionImport + '");'
 fs.writeFileSync(entryPoint, bootstrap);
 
+const dummyPackage = {
+  name: 'dummy'
+}
+fs.writeFileSync(path.join(wrapper, 'package.json'), JSON.stringify(dummyPackage));
+
+
 module.exports = [
   merge(baseConfig, {
     entry: entryPoint,