That way you can do SSR with the same codebase and a different webpack config for building for node.js. ReactDOM.render(, document.getElementById('root')); Uncaught Error: Shared module is not available for eager consumption. If we load a Micro Frontend that uses a different Angular version, Module Federation falls back to loading Angular twice, once the version for the shell and once the version for the Micro Frontend. Hence, lets proceed with an easier one. We noticed that as we added more micro-apps, our initial load was getting slower. Try running the mfe-profile app by itself by running ng serve mfe-profile --open in the terminal. As you progress and continue to add more micro-apps, you may start running into issues with managing all of these micro-apps. We have done this before with PHP and Angular to React or Angular2. Think of the remote entry file shown above as the public interface for Application1, and when another application loads in the remoteEntry file (in our case Host), it can now interact with Application1. Hence, the only clean solution here is to not share your AppModule but only lazy feature modules. When you first start using module federation and only have one or two micro-apps, managing the configurations for each app and the various ports they run on is simple. #2063 opened Jul 6, 2022 by JamieSlome. First, what exactly is module federation? Local overrides (via __webpack_override__ or override API when build is also a container) and specified overrides are provided to all referenced containers. If you wish to see the code associated with the following section, you can check it out in this branch. This package was previously available for $40 (USD) on PrivJS with over 92k downloads. Learn how Tenable finds new vulnerabilities and writes the software to help you find them, VR & AR App Development BlogViro Media, The Completely Incomplete Guide to Working on a Vue.js Project, Listen to any DOM Event using an Observable in Angular. In the module federation world, application 1 & 2 are called remotes. Module Federation shared deep dependency resolved incorrectly. Next.js Module Federation SSR brought server-side rendering, which is significantly more complex, in addition to client-side rendering of federated . } catch(e) { If you import BrowserModule instead, this will break . The container might still use it as a fallback. it works on localhost:8080; remote_app is app which rende only - hello world, good luck. The Angular team has adapted the HttpClient for the new standalone components. Common dependencies like Angular or the Auth0 library can be shared and hence don't need to be loaded several times. The Practical Guide to Module Federation. In this article, Im going to destroy my Module Federation example! The Problem. But if you just shared components or services, this might work at first sight. However, regardless of the update, everything went through the same build and deployment pipeline once the code was merged to master. The container interface supports get and init methods. Add SECURITY.md send PR. Module Federation is an exciting new addition to Webpack 5. As you see here, now, the shells AppModule uses the Micro Frontends AppModule. Technically, its just another file exposed by the npm package @angular/common. To make that happen, we have to open up the public/index.html file and add those remote entry files in: Now if we run the host application and investigate the network traffic, well see the remoteEntry.js file for both application 1 and 2 get loaded in via ports 3001 and 3002: At this point, we have covered a basic module federation setup. In dieser Schulung lernst du von bekannten Insidern und Experten der ersten Stunde anhand vieler Beispiele, wie du mit Angular erfolgreich moderne Anwendungen entwickelst. According to their documentation, Remote modules are modules that are not part of the current build and loaded from a so-called container at the runtime. Hence, both, the shell and the Micro Frontend have their very own copy of these services and this is something, no one is expecting. Setting eager: true for dependency via the ModuleFederationPlugin. What can we learn here? We distinguish between local and remote modules. However, the actual issue here is that Angular creates a root scope for each root module. import('./bootstrap.js'), // derive the publicPath with your own logic and set it with the __webpack_public_path__ API. To construct this situation, lets add another library to our monorepo: Also, make sure we have a path mapping for it pointing to its source code: Lets assume we also want to store the current user name in this library: And lets also assume, the AuthLibService delegates to this property: The shells AppComponent is just calling the login method: However, now the Micro Frontend has three ways of getting the defined user name: At first sight, all these three options should bring up the same value. Have you ever just ignored a peer dependency warning? Hence, the issue described here, will not happen. As a result of this new model, the bottleneck shown above is no longer an issue. To avoid getting off the rails, you should remember the following: Subscribe to our newsletter to get all the information about Angular. } The bootstrap.js file is the real entry point for our Host application. In this case, we should get a peer dependency warnings. Up until today, the implementation of micro front-end strategy seems to only bring increased complexity and inconsistent performance where the bad outweighs the good. Diagrams are great, but what does a system like this actually look like from a code perspective? It also calls the override API of these containers to provide overrides to them. To demonstrate this situation, let's install @angular/material and @angular/cdk in a version that is at least 2 versions behind our Angular version. It covers the internal implementation of Module Federation, and how Module Federation fits with other . Journal Entry 1 (Part A) Greetings Tutor, We have finally come to the end of the class module 3. This file imports another file called boostrap.js. Once initialized, the remote and any exposed component can be imported by the Host application like any other import. Generally, remotes are configured using URL's like in this example: But you can also pass in a promise to this remote, which will be resolved at runtime. Reading time: 4 minutes Written by But first, there is a handy Webpack plugin developed by Zack Jackson, one of the creators of Module Federation, called external-remotes-plugin. Now, lets switch to the Micro Frontends (mfe1) FlightModule to import the MatSnackBarModule: To make use of the snack bar in the FlightsSearchComponent, inject it into its constructor and call its open method: Also, for this experiment, make sure the webpack.config.js in the project mfe1 does not define the versions of the dependencies shared: Not defining these versions by hand forces Module Federation into trying to detect them automatically. One of the powerful features of module federation is that all micro-apps are capable of being built independently. The application shell defines commonly used libraries as shared modules to avoid duplication of them in the page builds. You signed in with another tab or window. The application automatically uses the up-to-date version of the components library. the shell. For this reason, webpack wants to find out which version of @angular/common is used. It offers huge potential when creating distributed applications and managing custom components or dependencies that are supposed to be shared across different parts of the application. The exposed access is separated into two steps: Step 1 will be done during the chunk loading. And ignoring them is often okay-ish as we know, at runtime everything will be fine. Our applications are responsible for determining what they want to expose to the outside world. This ensures that a given micro-app is never loaded in until its actually needed, leading to a huge boost in performance. options for dealing with version mismatches. Normally this is not required because webpack Module Federation is very smart with finding out which version you use. The upcoming Webpack 5 will bring lots of goodies to improve both developer experience and build time, but none of them is as ground-breaking as the new Module Federation. This is done to have a fall back bundle for resolving version conflicts. Additionally, loading in all the micro-apps as were doing in the index.html file above is not very flexible. As we implemented this solution for our own application we learned a number of things along the way that would have been helpful to know from the beginning. So that large applications can be split easily where each part can then be shared among other parts and may be developed by separate teams. Step 2 will be done during the module evaluation interleaved with other (local and remote) modules. Then with the help of my co-creator and the founder of Webpack it was turned into one of the most exciting features in the Webpack 5 core (there's some cool stuff in there, and the new API is really powerful and clean). Also, this articles presents some strategies for avoiding these pitfalls. How to force using shared deps from host instead of remotes. We did this by only loading in the code we needed for a given micro-app at the time it was needed (versus everything at once). The book also covers many practical topics include; state sharing across shared code, different deployment options, sharing non-view related code, writing your code to be resilient to code and network failures, and so much more. Try to use it in a multi-framework and/or a multi-version environment! Hence, the shell can set the user name and the lazy loaded mfe1 can access it: If auth-lib was a traditional npm package, we could just register it as a shared library with module federation. However, you dont need to worry: Its for a very good reason. The configurations for application1 and application2 are nearly identical to the one above, with the exception of the ModuleFederationPlugin. However, you know what they say: Beware of your wishes. Also, you have to know that the shells package.json points to Angular 12.0.0 without ^ or ~, hence we exactly need this very version. Step 2: In the module-federation-examples/basic-host-remote/app1 directory, execute npm start. This issue is typically seen if you are upgrading from webpack beta.16 to webpack beta.17. Well, when it comes to your leading, stateful framework e. g. Angular its a good idea to define it as a singleton. As you see here, the share function wraps the object with the shared libraries. The issue is because we havent actually done anything to load in those remote entry files. What is Module Federation The problem Bundling JavaScript files for client-side consumption has traditionally been a huge pain. However, you can see that each individual application within Tenable.io (the micro-apps) has its own Jenkins pipeline where it can lint, test, and build the code related to that individual application. For our purposes, the intent was to split up the Tenable.io application (previously its own workspace) into three individual micro-apps: This simple diagram illustrates the relationship between the Host and micro-apps: Lets analyze a before and after of our workspace.json file that shows how the tenable-io workspace (line 5) was split into three (lines 46). This module should only be imported in your shell application's root module. It need to be in dependencies, devDependencies or peerDependencies. It is possible to nest a container. Module Federation. // Initializes the shared scope. You have a host app hosted on https://my-host.com/app/* and a child app hosted on https://foo-app.com. live preview Check out this live module federation example on StackBlitz. Module Federation is an advanced front-end topic, that's for sure, so let's talk about some mistakes that people make, and misconceptions people have, about . Additionally, when our team added a new micro-app, our script was capable of handling it automatically. Module Federation is a Webpack 5 feature that has arrived to make it possible to share parts of an application to another at runtime. If we actually go to that port/file, well see something that looks like this: In the module federation world, application 1 & 2 are called remotes. It allows us to resolve the URLs at runtime using templating: plugins: [ new ModuleFederationPlugin({ name: "Host", remotes: { RemoteA: "RemoteA@ [window.appAUrl]/remoteEntry.js", Also, this duplicates all shared services registered for the root scope, e. g. with providedIn: 'root'. CSS Isolation at the host application level, There is a slot attribute error in webpack & vite, Typescript react - Cannot find module '.' or its corresponding type declarations, How to handle the react new jsx transform api. The reason for this is the secondary entry point @angular/common/http which is a bit like an npm package within an npm package. According to which criteria can we sub-divide a huge application into Micro Frontends? Module Federation is a feature from Webpack 5. Photo by Ilya Pavlov on Unsplash. ModuleFederationPlugin combines ContainerPlugin and ContainerReferencePlugin. If your webpack.config.js was generated with this or a newer version, it already uses this helper function. For this initial setup, were going to leverage a very simple approach to building and serving the three applications. You can see the actual component never gets loaded until we hit a path where it is needed. It will enable a much simpler and more practical setup for architecting and developing micro frontends compared to previous approaches. But be careful as all provided and fallback modules will always be downloaded. How Module Federation solves problems of building apps at scale. Verify it is up at http://localhost:3001. It's not possible to use a remote module without a chunk loading operation. Sibling containers cannot override each other's modules. Once we had the necessary information we needed for the remotes (via the REMOTE_INFO variable), we then updated our bootstrap.jsx file to leverage a new component we discuss below called . For RSC which applies various different loaders when that layer is active. Concept should be environment-independent. React Internals: Deep Dive React Server Components (as it is). There is also an 'auto' value available to output.publicPath which automatically determines the publicPath for you. Er hat berufsbegleitend IT und IT-Marketing in Graz sowie ebenfalls berufsbegleitend Computer Science in Hagen studiert und eine vier-semestrige Ausbildung im Bereich der Erwachsenenbildung abgeschlossen. Its recommended to provide it only at one point of your application, e.g. This way each build is able to access any other exposed module by loading it from its container. The container tries to provide shared modules, but if the shared module has already been used, a warning and the provided shared module will be ignored. It is analogous to a microservices approach but for client-side single-page applications written in JavaScript. when i didn't use shared i had error: try { Note: If you use Visual Studio, you can accomplish some of this same functionality through the NX Console extension. How can we avoid pitfalls when working with Module Federation. Whats New in our Module Federation Plugin 14.3? Hiermit erklre ich mich damit einverstanden, dass der Betreiber dieser Seite meine E-Mail-Adresse zum Zwecke des Versands des Newsletters verarbeiten kann. It is responsible for loading in the other micro-apps (application 1 and 2). Datenschutz. You have to bundle all the source code that you think the app is . As long as this is the case, you dont need to worry about duplicates. By using this practice, you assure (more or less) that these feature modules work the same when loaded into the shell as when used in standalone-mode. In a nutshell, this logic dynamically injects the tag into the index.html file when needed, and initializes the remote. To make this folder look like a npm package, there is a path mapping for it in the tsconfig.json: Please note that we are directly pointing to the src folder of the auth-lib. This allowed us to simply pass a series of terminal commands that get run. As shown in the commands below, we simply change directories into each of these applications (via cd apps/), and run the npm run dev command that is defined in each of the micro-apps package.json file. So we doubled its power by introducing an advanced API. A chunk loading operation is usually an import() call, but older constructs like require.ensure or require([]) are supported as well. Member-only. It should be possible to expose and use any module type that webpack supports. However, @angular/common itself is not a dependency of @angular/common and hence, the version cannot be found. Additionally, we created some remote utilities that allowed us to consistently manage our remotes. Have a question about this project? However, the peer dependency conflict gives Module Federation a hard time and so it brings up the following error: Unsatisfied version 12.0.0 of shared singleton module @angular/core (required ^10.0.0 || ^11.0.0-0) ; Zone: ; Task: Promise.then ; Value: Error: Unsatisfied version 12.0.0 of shared singleton module @angular/core (required ^10.0.0 || ^11.0.0-0). Later in the article, we will show a better way of managing multiple webpack configurations across your repository. If you really, really, really want to mix and match different versions of Angular, Ive got you covered with this article and this library. script.onload = () => { Youll see were not defining any remotes, and this is intentional. Each page of a Single Page Application is exposed from container build in a separate build. However, you can expose as much or as little as you want based on your needs. This is often known as Micro-Frontends, but is not limited to that. MFE1: useless-lib@^1.1.. Let's also consider we've configured the useless-lib as a singleton: My Product application uses the Angular Material library and when I'm running the Product application and accessing it through local url, the button (with angular material styles) renders correctly. However, if there is a version mismatch, singletons prevent Module Federation from falling back to a further library version. New workspaces are created via the npx create-nx-workspace command. Perhaps youve already seen that sometimes Module Federation generated duplicate bundles with slights different names: The reason for this duplication is that Module Federation generates a bundle per shared library per consumer. Microfrontend or Module Federation is a pattern in front-end development where a single application can be built from different separate builds. The Amur Region is the main agricultural region of the Far Eastern Federal District. However, if we only share auth-lib but not other-lib, we get the following result: As other-lib is not shared, both, auth-lib but also the micro frontend get their very own version of it. Ensure you have loaded the container before attempting to dynamically connect a remote container. Unfortunately, such a situation can confuses webpack Module Federation when trying to auto-detect the needed versions of peer dependencies. Future-oriented solutions to solve today's problems and anticipate tomorrow's needs. At this point, if we run nx serve host (serve being one of the targets defined for the host workspace) it will kick off the three commands shown on lines 1012. Solving the difficult problems of implementing micro front end with webpack 5 module Federation explain webpack 5 adds the function of Module Federation, which can help to form multiple independent builds into an application, and different builds can be developed and deployed independently. However, you should evaluate your needs and choose the one thats best for you. This technology is clearly a game-changer in javascript architecture. See the following articles to learn more about the intricacies of using module federation: Learn how Tenable finds new vulnerabilities and writes the software to help you find them, Start Cloud Now90 days of cloud2020 edition, The only question I ask while making decisions in business, Simple way to manage module imports within a python package folder hierarchy, Module Federation Managing Your Micro-Apps. What can we learn from this? This plugin creates an additional container entry with the specified exposed modules. Advantages. According to their documentation, "Remote modules are modules that are not part of the current build and loaded from a so . . On this occasion,. In general there are many ways to implement . And libraries in that sense are just folders with source code. Circular dependencies between containers are also possible. How typesafe can a remote be with Typescript? So far, weve seen that Module Federation is a straightforward solution for creating Micro Frontends on top of Angular. i created project for demostation my problem -> module_federation_test. The purpose of this component was to dynamically attach the remote entry to the page and then initialize the micro-app lazily so it could be leveraged by Host.

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