You will have the same challenge with other packages using secondary entry points, e. g. @angular/material. This is often known as Micro-Frontends, but is not limited to that. Its recommended to provide it only at one point of your application, e.g. const proxy = { Hence, the only clean solution here is to not share your AppModule but only lazy feature modules. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Module Federation Motivation Multiple separate builds should form a single application. For a real world application that has many micro-apps, this means the performance of your initial load will most likely be impacted. Add SECURITY.md send PR. This was done so that if a new micro-app was added it would be automatically picked up without any additional configuration by the engineer. As you can see below, this logic is based on the workspace.json file. On this occasion,. A simple but also non preferable solutions is to put your shared services into the platform scope: However, normally, this scope is intended to be used by Angular-internal stuff. One of the powerful features of module federation is that all micro-apps are capable of being built independently. However, in our case, the auth-lib is just a library in our monorepo. Step 2: In the module-federation-examples/basic-host-remote/app1 directory, execute npm start. I imported Angular's BrowserModule in my micro frontends which was wrong. In the demo above, we have a Host application that is the main entry point for our application. You can try this out by updating the shells app.routes.ts as follows: To make exploring this a bit easier, Ive provided this Micro Frontend via a Azure Static Web App found at the shown URL. Module Federation. Hence, the issue described here, will not happen. Hence, we have two root scopes now. You will find yourself repeating the same configuration over and over again. The configurations for application1 and application2 are nearly identical to the one above, with the exception of the ModuleFederationPlugin. it works on localhost:8080; remote_app is app which rende only - hello world, good luck. This approach allowed our teams to work more efficiently, and allowed us to significantly reduce the initial load time of our application. } #2063 opened Jul 6, 2022 by JamieSlome. This issue is typically seen if you are upgrading from webpack beta.16 to webpack beta.17. Loading remote modules is considered an asynchronous operation. Module Federation is a feature from Webpack 5. If your webpack.config.js was generated with this or a newer version, it already uses this helper function. Note: If you use Visual Studio, you can accomplish some of this same functionality through the NX Console extension. This created a natural bottleneck where each team was reliant on any change made previously by another team. 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. Each build acts as a container and also consumes other builds as containers. The actual logic of the component is highlighted below. Unfortunately, such a situation can confuses webpack Module Federation when trying to auto-detect the needed versions of peer dependencies. Fortunately, Module Federation got us covered with such scenarios. The application is eagerly executing an application that is operating as an omnidirectional host. 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. Unsurprisingly, @angular/common/http uses @angular/common and webpack recognizes this. The problem was webpack applies loader layers. The application shell is also a separate build referencing all pages as remote modules. This way each build is able to access any other exposed module by loading it from its container. If you go with a traditional CLI project, you need to adjust this by hand. } It allows us to resolve the URLs at runtime using templating: plugins: [ new ModuleFederationPlugin({ name: "Host", remotes: { RemoteA: "RemoteA@ [window.appAUrl]/remoteEntry.js", For this reason, webpack wants to find out which version of @angular/common is used. Well, when it comes to your leading, stateful framework e. g. Angular its a good idea to define it as a singleton. As demonstrated in the following diagram, multiple teams were responsible for individual parts of the Tenable.io application. To provoke this error, adjust your shells webpack.config.js as follows: Please note, that these libraries are not configured to be singletons anymore. Module Federation of Webpack 5 is an absolutely fantastic technology which can easily revolutionize the way we share source code between applications. Webpack 5 Module Federation is a really useful, yet still somewhat complex approach to implement micro frontends. This allowed us to speed up our boot time by 2x and our rebuild time by 7x, which was a significant improvement. A container is created through a container entry, which exposes asynchronous access to the specific modules. It is automatically inferred for the module requests by default, set requiredVersion to false when automatic infer should be disabled. As a result, the compiler cannot protect you as well as you are used to. Check out this live module federation example on StackBlitz. This was the purpose of the serve script shown above, i.e. We distinguish between local and remote modules. The container might still use it as a fallback. 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. I have two microfrontends applications (Host and Product) in angular v.13 and using the concept of module federation with webpack 5. However, the actual issue here is that Angular creates a root scope for each root module. As a result of this new model, the bottleneck shown above is no longer an issue. It covers the internal implementation of Module Federation, and how Module Federation fits with other sharing options. We strongly recommend using an asynchronous boundary. While Module Federation is really a straight and thoroughly thought through solution, using Micro Frontends means in general to make runtime dependencies out of compile time dependencies. Whats New in our Module Federation Plugin 14.3? Could provide and consume multiple different versions when you have nested node_modules. Containers can use modules from other containers. This command adds module-federation lib and creates the webpack config file to setup remotes or hosts. Let's start by getting our environment configured. Build and ship in parallel. Since Angular 14.2, it's possible to use Standalone Components as Angular Elements. This allowed us to simply pass a series of terminal commands that get run. 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. Uncaught Error: Module "./Button" does not exist in container. Hence, both, the shell and the Micro Frontend have their very own copy of these services and this is something, no one is expecting. Circular dependencies between containers are also possible. Local modules are normal modules which are part of the current build. More specifically, it enables us to break apart our application into a series of smaller applications that can be developed and deployed individually, and then put back together into a single application. React Internals: Deep Dive React Server Components (as it is). So in our case, we will only expose the index file (.) in the src directory. In a nutshell, it is webpacks way of implementing a micro-frontend (though its not limited to only implementing frontend systems). stable (0.4.x) under development (1.0.x) Debian distribution only contains stable version and this is the one that you have installed using apt-get command.. Now pyrow is trying to import usb.core which only exist in 1.0.x version of the library. Advanced API in Webpack 5..-beta.17. To avoid this situation, you can assign versions to all shared libraries by hand: Obviously, this is cumbersome and so we came up with another solution. Let's run it. Dies ist Beitrag 7 von 10 der Serie Module Federation, Updated on 2021-06-10 for CLI 14.x and above. For example, with this logic in place, we could accommodate a host of various engineering needs: You can easily imagine that as your application grows and your codebase gets larger and larger, this type of functionality can be extremely powerful since you only have to build the parts of the application related to what youre working on. Setting eager: true for dependency via the ModuleFederationPlugin. [Question] What's the best practices of shared dependencies? Then let's setup the menu application using port 4201 ng add @angular -architects/module-federation --project menu --port 4201 That command change angular.json to allow the menu to be accessible to port 4201 and creates webpack.config.js for us. So we doubled its power by introducing an advanced API. This way, evaluation order is unaffected by converting a module from local to remote or the other way around. So why cant the Host find them? 1. However, you should evaluate your needs and choose the one thats best for you. This will install wepback and the dependencies we need for our webpack configuration. In the module federation world, application 1 & 2 are called remotes. script.src = remoteUrlWithVersion There are options to choose from: You can set the dependency as eager inside the advanced API of Module Federation, which doesnt put the modules in an async chunk, but provides them synchronously. Webpack Module Federation is only available in version 5 and above of webpack. 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. 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. Photo by Ilya Pavlov on Unsplash. The exposed access is separated into two steps: Step 1 will be done during the chunk loading. We're going to need more tooling if we want to get good type information in an application that uses . For RSC which applies various different loaders when that layer is active. Collision between modules from different remotes, IIFEs - Immediately invoked function expressions, Birth of JavaScript Modules happened thanks to Node.js, npm + Node.js + modules mass distribution, Webpack 5 Module Federation: A game-changer in JavaScript architecture. In our case, the exposes property of the ModuleFederationPlugin defines what is exposed to the Host application when it goes to import from either of these. It also calls the override API of these containers to provide overrides to them. Concept should be environment-independent. 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. The reason for this is the secondary entry point @angular/common/http which is a bit like an npm package within an npm package. In the previous article, when it came to importing and using Application 1 and 2, we simply imported the micro-apps at the top of the bootstrap file and hard coded the remote entries in the index.html file: However in the real world, this is not the best approach. Later in the article, we will show a better way of managing multiple webpack configurations across your repository. It is analogous to a microservices approach but for client-side single-page applications written in JavaScript. One of the most important things we did here was create a serve.js file that allowed us to build/serve only those micro-apps an engineer needed to work on. Step 2 will be done during the module evaluation interleaved with other (local and remote) modules. We rely on the NX framework discussed in the previous article. Name - Abishek Timsina. As discussed in the previous article, the first step in updating our architecture involved the consolidation of our two repositories into one and the introduction of the NX framework. If you really, really, really want to mix and match different versions of Angular, Ive got you covered with this article and this library. 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. Verify it is up at http://localhost:3001. Module Federation shared deep dependency resolved incorrectly. However, if everything is configured in the right way, only one of these duplicates should be loaded at runtime. The entry point for our host application is the index.js file shown below. const version = urlParams.get('app1VersionParam') We will be using a yarn mono-repo structure here for simplicity, but the idea behind Module Federation is to allow teams to operate autonomously, so in the real world, your SPA's would most likely live in their own repositories. Already on GitHub? How typesafe can a remote be with Typescript? What can we learn from this? As you see here, the share function wraps the object with the shared libraries. Multiple separate builds should form a single application. This also holds true for secondary entry points our shared libraries belong to. try { It need to be in dependencies, devDependencies or peerDependencies. This increased the speed at which our engineers got the application running, while also consuming as little local memory as possible. . 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. However, when dealing with it, several additional questions come in mind: Our free eBook (about 100 pages) covers all these questions and more: Module Federation is really clever when it comes to auto-detecting details and compensating for version mismatches. 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 . Well, it would be a good idea to also share the dependencies of our shared libraries (regardless of sharing libraries in a monorepo or traditional npm packages!). Notice when we navigate to the /profile route, we see a console error. We have done this before with PHP and Angular to React or Angular2. Nx does this by default. This command starts the webpack dev server for each application. Unfortunately, such a situation can confuses webpack Module Federation when trying to auto-detect the needed versions of peer dependencies. And libraries in that sense are just folders with source code. 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). // This part depends on how you plan on hosting and versioning your federated modules This way, evaluation order is unaffected by converting a module from local to remote or the other way around. 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. However, it can only be as good as the meta data it gets. resolve(proxy) 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 . Esto nos lleva al siguiente resultado: Module Federation decide ir con la versin 1.0.1 ya que es la versin ms alta compatible con ambas aplicaciones segn el versionado semntico (^1.0.0 significa, que tambin podemos ir con una versin menor y de parche superior). Unable to find required version for "@angular/common" in description file (C:\Users\Manfred\Documents\artikel\ModuleFederation-Pitfalls\example\node_modules\@angular\common\package.json). The goal is to show typical pitfalls that come up when using Module Federation together with Angular. This way you could dynamically load an A/B test which provides a different version of a shared module. For example, your entry looked like this: Let's create bootstrap.js file and move contents of the entry into it, and import that bootstrap into the entry: This method works but can have limitations or drawbacks. As long as this is the case, you dont need to worry about duplicates. #2033 opened Jun 21, 2022 by tzachbon. How to force using shared deps from host instead of remotes. Breakthrough! console.log('remote container already initialized') As you progress and continue to add more micro-apps, you may start running into issues with managing all of these micro-apps. The Problem. This is also the key for sharing data like the current user or global filters. 1) Integrate as Standard Angular Module The most obvious solution is just to create a separate Angular Module and lazy load it through the router. By making the changes above, we were able to significantly improve our overall performance. This technology is clearly a game-changer in javascript architecture. It can realize the cross -application sharing module, as shown in the figure: 2. We added Okta into the shell application, but now we need to turn the mfe-profile application into a micro frontend and share the authenticated state. Step 1: In the module-federation-examples/basic-host-remote/app2 directory, execute npm start. Advantages. In our case, a host application that loaded in the other micro-apps made the most sense for us. Module Federation is a game-changer in Javascript Architecture because before this, sharing code was clunky and just didn't feel smooth . This allows us to use these shared modules in the initial chunk. Youll see were not defining any remotes, and this is intentional. It is possible to nest a container. return window.app1.init(arg) While @angular/material and @angular/cdk officially need @angular/core 10, the rest of the application already uses @angular/core 12. 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. const remoteUrlWithVersion = 'http://localhost:3001/' + version + '/remoteEntry.js' This gives you the following advantages: Smooth integration and lazy loading Easy code sharing between main and orders But this approach also comes with some drawbacks: Main app build takes longer Module Federation was already powerful. For this, let's consider the following version mismatch: Shell: useless-lib@^2. "Practical Module Federation" is the first, and only, book on Webpack 5's innovative new live code sharing mechanism. It allows to use requiredVersion: 'auto' and converts the value auto to the value found in your shells (or micro frontends) package.json. Module Federation is an exciting new addition to Webpack 5. This article does a good job in breaking these options down. In this article, Im going to destroy my Module Federation example! This approach is particularly helpful when you mount independently deployed child applications on the sub path of the host domain. However, you dont need to worry: Its for a very good reason. Installation Use npm npm install @originjs/vite-plugin-federation --save-dev Use yarn yarn add @originjs/vite-plugin-federation --dev Usage change the configuration For a Vite project, in vite.config.js : It can be leveraged to connect remote containers to a host container dynamically at runtime. This shows that webpack looks into the package.json files of all the shared dependencies for determining the needed versions. 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. This is done to have a fall back bundle for resolving version conflicts. 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. Each application consumes components from the components library container. It covers the internal implementation of Module Federation, and how Module Federation fits with other . It is a solution to de-composition and routing for multiple front-end applications. We use NX to build two Angular applications using PrimeNG, then share a component between the two applications using module federation.Code: https://github.c. }), // this name needs to match with the entry name, //bootstrap app e.g. I have two apps: host_app is app which render remote app on different port. pyusb library comes in two versions:. Well occasionally send you account related emails. Microfrontend or Module Federation is a pattern in front-end development where a single application can be built from different separate builds. Module Federation is the Module Federation, which is a new feature in Webpack5. In terms of the volume of grown products (soybeans), the Amur Region accounts for over 40 percent of the total gross harvest of the Russian Federation. If you start your shell and load the Micro Frontend, you will see this error. Ive written down some details on this and on options for dealing with version mismatches here. Sibling containers cannot override each other's modules. We are able to import Application1 and Application2 and load them in like a normal component (lines 1516): Note: Had we exposed more specific files as discussed above, our import would be more granular in nature: At this point, you might think were done. Specifically, it would return the name of the remotes along with the port they should run on. In dieser Schulung lernst du von bekannten Insidern und Experten der ersten Stunde anhand vieler Beispiele, wie du mit Angular erfolgreich moderne Anwendungen entwickelst. For this initial setup, were going to leverage a very simple approach to building and serving the three applications. Webpack 5 introduced support for module federation.This is the ability to load modules at runtime instead of compiling them into your JavaScript application. However, you know what they say: Beware of your wishes. However, regardless of the update, everything went through the same build and deployment pipeline once the code was merged to master. The good news almost Next.js Module Federation brought, for the first time, client-side rendering to federated modules on Next.js. The Micro frontend ) or a newer version, it is a constellation the. 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