v1.2

Author: manfredsteyer

packages/mf/README.md

@@ -15,7 +15,7 @@ Big thanks to the following people who helped to make this possible:
 
 ## Motivation 💥
 
-Module Federation allows to load separately compiled and deployed code (like micro frontends or plugins) into an application. This plugin makes Module Federation work together with Angular and the CLI.
+Module Federation allows loading separately compiled and deployed code (like micro frontends or plugins) into an application. This plugin makes Module Federation work together with Angular and the CLI.
 
 ## Features 🔥
 
@@ -27,13 +27,20 @@ Module Federation allows to load separately compiled and deployed code (like mic
 
 The module federation config is a **partial** webpack configuration. It only contains stuff to control module federation. The rest is generated by the CLI as usual.
 
+Since Version 1.2, we also provide some advanced features like:
+
+✅ Dynamic Module Federation support
+
+✅ Sharing Libs of a Monorepo
+
+
 ## Usage 🛠️
 
 1. ``ng add @angular-architects/module-federation``
 2. Adjust the generated ``webpack.config.js`` file
 3. Repeat this for further projects in your workspace (if needed)
 
-## Opting in into webpack 5 with CLI 11 🧐
+## Opt-in into webpack 5 with CLI 11 🧐
 
 - You need to use **yarn** b/c it allows to override dependencies
     - Existing Projects: ``ng config -g cli.packageManager yarn``
@@ -49,7 +56,19 @@ The module federation config is a **partial** webpack configuration. It only con
 
 - Run **yarn** to install all packages
 
-Please that the CLI's webpack 5 support is current experimental. 
+Please that the CLI's webpack 5 support is experimental in CLI 11. Here, you find a list with [unresolved issues](https://github.com/angular/angular-cli/pull/18873) in the current version. 
+
+## Getting Started 🧪
+
+Please find here a [tutorial](https://github.com/angular-architects/module-federation-plugin/blob/main/packages/mf/tutorial/tutorial.md) that shows how to use this plugin.
+
+![Microfrontend Loaded into Shell](https://github.com/angular-architects/module-federation-plugin/raw/main/packages/mf/tutorial/result.png)
+
+[>> Start Tutorial](https://github.com/angular-architects/module-federation-plugin/blob/main/packages/mf/tutorial/tutorial.md)
+
+## Documentation 📰
+
+Please have a look at this [article series about Module Federation](https://www.angulararchitects.io/aktuelles/the-microfrontend-revolution-part-2-module-federation-with-angular/).
 
 ## Example 📽️
 
@@ -61,18 +80,146 @@ This [example](https://github.com/manfredsteyer/module-federation-plugin-example
 Please have a look into the example's **readme**. It points you to the important aspects of using Module Federation.
 
 
-## Tutorial 🧪
+## Advanced Features
 
-Please find here a [tutorial](https://github.com/angular-architects/module-federation-plugin/blob/main/packages/mf/tutorial/tutorial.md) that shows step by step how to introduce Module Federation into the above mentioned example.
+While the above-mentioned tutorial and blog articles guide you through using Module Federation, this section draws your attention to some advanced aspects of this plugin and Module Federation in general. 
 
-![Microfrontend Loaded into Shell](https://github.com/angular-architects/module-federation-plugin/raw/main/packages/mf/tutorial/result.png)
+### Dynamic Module Federation
 
-[>> Start Tutorial](https://github.com/angular-architects/module-federation-plugin/blob/main/packages/mf/tutorial/tutorial.md)
+Since version 1.2, we provide helper functions making dynamic module federation really easy. Just use our ``loadRemoteModule`` function instead of a dynamic ``include``, e. g. together with lazy routes:
+
+```typescript
+import { loadRemoteModule } from '@angular-architects/module-federation';
+
+[...]
+const routes: Routes = [
+    [...]
+    {
+        path: 'flights',
+        loadChildren: () =>
+            loadRemoteModule({
+                remoteEntry: 'http://localhost:3000/remoteEntry.js',
+                remoteName: 'mfe1',
+                exposedModule: './Module'
+            })
+            .then(m => m.FlightsModule)
+    },
+    [...]
+]
+```
+
+If somehow possible, load the ``remoteEntry`` upfront. This allows Module Federation to take the remote's metadata in consideration when negotiating the versions of the shared libraries. 
+
+For this, you could call ``loadRemoteEntry`` BEFORE bootstrapping Angular:
+
+```typescript
+// main.ts
+import { loadRemoteEntry } from '@angular-architects/module-federation';
+
+Promise.all([
+    loadRemoteEntry('http://localhost:3000/remoteEntry.js', 'mfe1')
+])
+.catch(err => console.error('Error loading remote entries', err))
+.then(() => import('./bootstrap'))
+.catch(err => console.error(err));
+```
+
+The ``bootstrap.ts`` file contains the source code normally found in ``main.ts`` and hence, it calls ``platform.bootstrapModule(AppModule)``. You really need this combination of an upfront file calling loadRemoteEntry and a dynamic import loading another file bootstrapping Angular because Angular itself is already a shared library respected during the version negotiation.
+
+Then, when loading the remote Module, just skip the ``remoteEntry`` property:
+
+```typescript
+import { loadRemoteModule } from '@angular-architects/module-federation';
+
+[...]
+const routes: Routes = [
+    [...]
+    {
+        path: 'flights',
+        loadChildren: () =>
+            loadRemoteModule({
+                // Skipped - already loaded upfront:
+                // remoteEntry: 'http://localhost:3000/remoteEntry.js',
+                remoteName: 'mfe1',
+                exposedModule: './Module'
+            })
+            .then(m => m.FlightsModule)
+    },
+    [...]
+]
+```
+
+### Sharing Libs of a Monorepo
+
+Let's assume, you have an Angular CLI Monorepo or an Nx Monorepo using path mappings in ``tsconfig.json`` for providing libraries:
+
+```json
+"shared-lib": [
+  "projects/shared-lib/src/public-api.ts",
+],
+```
+
+You can now share such a library across all your micro frontends (apps) in your mono repo. This means, this library will be only loaded once.
+
+To accomplish this, just register this lib name with the ``SharedMappings`` instance in your webpack config:
+
+```javascript
+const mf = require("@angular-architects/module-federation/webpack");
+const path = require("path");
+
+[...]
+
+const sharedMappings = new mf.SharedMappings();
+sharedMappings.register(
+  path.join(__dirname, '../../tsconfig.json'),
+  ['auth-lib']  
+);
+```
+
+Beginning with version 1.2, the boilerplate for using ``SharedMappings`` is generated for you. You only need to add your lib's name here.
+
+This generated code includes providing the metadata for these libraries for the ``ModuleFederationPlugin`` and adding a plugin making sure that even source code generated by the Angular Compiler uses the shared version of the library. 
+
+```javascript
+plugins: [
+    new ModuleFederationPlugin({
+        [...]
+        shared: {
+            [...]
+            ...sharedMappings.getDescriptors()
+        }
+    }),
+    sharedMappings.getPlugin(),
+],
+```
+
+### Pitfalls when sharing libraries of a Monorepo
+
+#### Bug with styleUrls
+
+Currently, there is, unfortunately, a bug in the experimental CLI/webpack5 integration causing issues when using shared libraries together with components pointing to ``styleUrls``. For the time being, you can work around this issue by removing all ``styleUrls`` in your applications and libraries.
+
+#### Sharing a library that is not even used
+
+If you shared a local library that is not even used, you get the following error:
+
+```
+./projects/shared-lib/src/public-api.ts - Error: Module build failed (from ./node_modules/@ngtools/webpack/src/index.js):
+Error: C:\Users\Manfred\Documents\projekte\mf-plugin\example\projects\shared-lib\src\public-api.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property.
+    at AngularCompilerPlugin.getCompiledFile (C:\Users\Manfred\Documents\projekte\mf-plugin\example\node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:957:23)
+    at C:\Users\Manfred\Documents\projekte\mf-plugin\example\node_modules\@ngtools\webpack\src\loader.js:43:31
+```
+
+#### Not exported Components
 
+If you use a shared component without exporting it via your library's barrel (``index.ts`` or ``public-api.ts``), you get the following error at runtime:
 
-## More Details on Module Federation 📰
+```
+core.js:4610 ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'ɵcmp' of undefined
+TypeError: Cannot read property 'ɵcmp' of undefined
+    at getComponentDef (core.js:1821)
+```
 
-Have a look at this [article series about Module Federation](https://www.angulararchitects.io/aktuelles/the-microfrontend-revolution-part-2-module-federation-with-angular/).
 
 ## Angular Trainings, Workshops, and Consulting 👨‍🏫
 

packages/mf/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@angular-architects/module-federation",
-  "version": "1.2.0-rc.9",
+  "version": "1.2.0",
   "license": "MIT",
   "repository": {
     "type": "GitHub",

packages/mf/src/schematics/mf/schematic.ts

@@ -61,7 +61,7 @@ function makeMainAsync(main: string): Rule {
 
     const mainContent = tree.read(main);
     tree.create(bootstrapName, mainContent);
-    tree.overwrite(main, "import('./bootstrap');\n");
+    tree.overwrite(main, "import('./bootstrap')\n\t.catch(err => console.error(err));\n");
 
   }
 }