When this command runs, it actually serves this particular application on port 3001, and the entry point of the application is a file called remoteEntry.js. One of the powerful features of module federation is that all micro-apps are capable of being built independently. However, if everything is configured in the right way, only one of these duplicates should be loaded at runtime. As you see here, now, the shells AppModule uses the Micro Frontends AppModule. The child app is also mounted on the host domain, hence, Try to use it in a multi-framework and/or a multi-version environment! Will always be provided, even if not used. import('./bootstrap.js'), // derive the publicPath with your own logic and set it with the __webpack_public_path__ API. 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, the actual issue here is that Angular creates a root scope for each root module. 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). Once this phase was complete, we were ready to move to the next phase: the introduction of module federation for the purposes of breaking our Tenable.io application into a series of micro-apps. Microfrontend or Module Federation is a pattern in front-end development where a single application can be built from different separate builds. Before we dive into what module federation is and why we used it, its important to first understand the problem we wanted to solve. 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. Lets finish this tour with something, that just looks like an issue but is totally fine. What can we learn here? Module Federation shared deep dependency resolved incorrectly, Fallback to lower version of shared library with singletone: true, The third-party UI library is referenced in the remote module, and the local UI library does not work, shared-routing: Profile page blank on first render in production build, Followup: Properly accomplish nested routing, Can the main application work without remoteEntry in development, Bi-directional shared files - strange behavior, Angular singleton service initiated multiple times, React In Vue (converted to jsx) button event not firing, angular11-microfrontends-lazy-components | styles not getting applied for shared component. However, there is a constellation with the same underlying issue that is everything but obvious. For RSC which applies various different loaders when that layer is active. Whats New in our Module Federation Plugin 14.3? Start by creating a new project folder with the . This way each page can be separately deployed. 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. 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. The application is eagerly executing an application that is operating as an omnidirectional host. The Practical Guide to Module Federation. 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. You signed in with another tab or window. Common dependencies like Angular or the Auth0 library can be shared and hence don't need to be loaded several times. const remoteUrlWithVersion = 'http://localhost:3001/' + version + '/remoteEntry.js' 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. Module Federation was already powerful. And ignoring them is often okay-ish as we know, at runtime everything will be fine. The problem that I encountered had to do with the imports of an Angular module. You have to bundle all the source code that you think the app is . In our case, a host application that loaded in the other micro-apps made the most sense for us. 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. It also allows multiple teams to work in parallel, without interfering with each other's code. In this demo, were keeping things as simple as possible. try { In this article, Im going to destroy my Module Federation example! Uncaught Error: Module "./Button" does not exist in container. } Once initialized, the remote and any exposed component can be imported by the Host application like any other import. Loading remote modules is considered an asynchronous operation. 2. Overriding modules is a one-directional operation. } If you really, really, really want to mix and match different versions of Angular, Ive got you covered with this article and this library. const proxy = { Unfortunately, such a situation can confuses webpack Module Federation when trying to auto-detect the needed versions of peer dependencies. } #2033 opened Jun 21, 2022 by tzachbon. As long as this is the case, you dont need to worry about duplicates. Hence, the issue described here, will not happen. i created project for demostation my problem -> module_federation_test. Exposes define what the micro frontend app exposes to other apps. Webpack 5 introduced the Module Federation Plugin which has rapidly become the go-to solution for splitting large monolithic applications into smaller composable pieces. It's not possible to use a remote module without a chunk loading operation. https://foo-app.com is expected to be accessible via https://my-host.com/app/foo-app and https://my-host.com/app/foo-app/* requests are redirected to https://foo-app.com/* via a proxy. Circular dependencies between containers are also possible. However, you should evaluate your needs and choose the one thats best for you. Module Federation. How to force using shared deps from host instead of remotes. // we can now resolve this Promise The idea is that the micro frontend apps have outputs called exposes and inputs called entries. You should resolve this promise with any module that fits the get/init interface described above. to your account. The reason for this is very likely that we are not exposing the whole Micro Frontend via Module Federation but only selected parts, e. g. some Features Modules with Child Routes: Or to put it in another way: DO NOT expose the Micro Frontends AppModule. Hiermit erklre ich mich damit einverstanden, dass der Betreiber dieser Seite meine E-Mail-Adresse zum Zwecke des Versands des Newsletters verarbeiten kann. } However, you dont need to worry: Its for a very good reason. 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. Module FederationFederated Application Architectures Summary There's been a lot of excitement in the community about the upcoming module federation feature in Webpack 5. The following configuration shows a pretty bare bones implementation for our Host application. The good news almost So far, weve seen that Module Federation is a straightforward solution for creating Micro Frontends on top of Angular. To avoid getting off the rails, you should remember the following: Subscribe to our newsletter to get all the information about Angular. Each application consumes components from the components library container. Change the exposes from: You are likely missing the remote container, make sure it's added. Could provide and consume multiple different versions when you have nested node_modules. We're going to need more tooling if we want to get good type information in an application that uses . 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. 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. 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). Module Federation is a Webpack 5 feature that has arrived to make it possible to share parts of an application to another at runtime. The structure of the application is shown in the figure: 4. This command adds module-federation lib and creates the webpack config file to setup remotes or hosts. The reason for this is the secondary entry point @angular/common/http which is a bit like an npm package within an npm package. It can realize the cross -application sharing module, as shown in the figure: 2. Ive written down some details on this and on options for dealing with version mismatches here. console.log('remote container already initialized') However, if you ran the application you would get the following error message, which tells us that the import on line 15 above isnt working: To understand why this is, lets take a look at what happens when we build application1 via the webpack-dev-server command. Micro frontends with Module Federation give each development team greater autonomy over how their portion of the app should be built. If you wish to see the code associated with the following section, you can check it out in this branch. Journal Entry 1 (Part A) Greetings Tutor, We have finally come to the end of the class module 3. A container is created through a container entry, which exposes asynchronous access to the specific modules. By clicking Sign up for GitHub, you agree to our terms of service and Getting Setup. But first, there is a handy Webpack plugin developed by Zack Jackson, one of the creators of Module Federation, called external-remotes-plugin. Switch to the PRODUCTS directory and install the following . the same library. Honestly, I think we all know such situations. This plugin creates an additional container entry with the specified exposed modules. For this, let's consider the following version mismatch: Shell: useless-lib@^2. Module Federation is a feature from Webpack 5. Since were going to be creating a series of highly customized webpack configurations, we instead opted to leverage the @nrwl/workspace:run-commands executor. 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. We noticed that as we added more micro-apps, our initial load was getting slower. Have you ever just ignored a peer dependency warning? The container might still use it as a fallback. Member-only. Chunk loading should load everything needed in parallel (web: single round-trip to server). 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. 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. This increased the speed at which our engineers got the application running, while also consuming as little local memory as possible. How can we avoid pitfalls when working with Module Federation. If you look at the previous demo, youll see our serve command for the Tenable.io application leveraged the @nrwl/web:dev-server executor. 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. This is often known as Micro-Frontends, but is not limited to that. 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. 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). 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. 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. 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. However, regardless of the update, everything went through the same build and deployment pipeline once the code was merged to master. it works on localhost:8081; And my projec didn't work. Deprecated API usage: The SVG back-end is no longer maintained and may be removed in the future. This approach is particularly helpful when you mount independently deployed child applications on the sub path of the host domain. Sign in Instead of URLs pointing to the other micro-frontends, here file paths are used which point to the other micro-frontends. Module Federation is an exciting new addition to Webpack 5. it works on localhost:8080; remote_app is app which rende only - hello world, good luck. However, if we expect the AppModule to provide some global services like the HttpClient, we also need to do this in the shells AppModule: In a very simple scenario you might try to just expose the Micro Frontends AppModule. However, it can only be as good as the meta data it gets. Note: If you use Visual Studio, you can accomplish some of this same functionality through the NX Console extension. It is analogous to a microservices approach but for client-side single-page applications written in JavaScript. return window.app1.init(arg) pyusb library comes in two versions:. Verify it is up at http://localhost:3002. Remote modules are modules that are not part of the current build and loaded from a so-called container at the runtime. Beta 17 has been out for a week or so. Local overrides (via __webpack_override__ or override API when build is also a container) and specified overrides are provided to all referenced containers. As a result, the compiler cannot protect you as well as you are used to. Inspired by Webpack Module Federation feature. 1. Prepare the following applications. React Internals: Deep Dive React Server Components (as it is). Youll see were not defining any remotes, and this is intentional. It is automatically inferred for the module requests by default, set requiredVersion to false when automatic infer should be disabled. 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 problem was webpack applies loader layers. Hence, we have two instances of it in place here. Local modules are normal modules which are part of the current build. Breakthrough! Shared modules are modules that are both overridable and provided as overrides to nested container. The actual logic of the component is highlighted below. As demonstrated in the following diagram, multiple teams were responsible for individual parts of the Tenable.io application. We will build off the demo from the previous article to introduce module federation for the Tenable.io application. 1. This was the purpose of the serve script shown above, i.e. script.src = remoteUrlWithVersion WitUTF-8. One could allow the host to set the publicPath of a remote module at runtime by exposing a method from that remote module. It is responsible for loading in the other micro-apps (application 1 and 2). #2063 opened Jul 6, 2022 by JamieSlome. Name - Abishek Timsina. This way, evaluation order is unaffected by converting a module from local to remote or the other way around. This way each build is able to access any other exposed module by loading it from its container. Its recommended to provide it only at one point of your application, e.g. In our initial approach with this new architecture, we made this mistake and paid for it from a performance perspective. 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 It is not limited to just exposing the whole micro frontend app itself, it can also be just parts of it like functions, components, full . Hence, we have two root scopes now. 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. What is Module Federation The problem Bundling JavaScript files for client-side consumption has traditionally been a huge pain. In this article, we'll walk through how Nx makes it extremely straightforward to set up Module Federation for an Angular application, both from scratch and also for . ist Trainer und Berater mit Fokus auf Angular. We know application 1 and 2 are getting built, and theyre being served up at ports 3001 and 3002. Dies ist Beitrag 7 von 10 der Serie Module Federation, Updated on 2021-06-10 for CLI 14.x and above. This also holds true for secondary entry points our shared libraries belong to. This is the exposes propertys purpose: it defines a public API that determines which files are consumable. script.onload = () => { In this case, it would be much better if the micro-apps could be loaded in dynamically only when a particular route is hit. 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. Webpack Module Federation is only available in version 5 and above of webpack. Pitfalls with Module Federation and Angular, Angular Schulung: Strukturierte Einfhrung, Design mit System: Skalierbare Design Systems mit Storybook und Angular, Reaktive Angular-Architekturen mit RxJS und NGRX (Redux), Professional NGRX: Advanced State Management & Best Practices, The Refurbished HttpClient in Angular 15 Standalone APIs and Functional Interceptors, Angular Elements: Web Components with Standalone Components, The Solution: Easier and More Secure With Authentication Gateways, The Microfrontend Revolution: Module Federation in Webpack 5, The Microfrontend Revolution: Module Federation with Angular, Building A Plugin-based Workflow Designer With Angular and Module Federation, Getting Out of Version-Mismatch-Hell with Module Federation, Using Module Federation with (Nx) Monorepos and Angular, Multi-Framework and -Version Micro Frontends with Module Federation: Your 4 Steps Guide, Module Federation with Angulars Standalone Components. See the next article to learn about how we dealt with our vendor libraries. This plugin adds specific references to containers as externals and allows to import remote modules from these containers. Fills it with known provided modules from this build and all remotes, // Initialize the container, it may provide shared modules, 'app1@http://localhost:3001/remoteEntry.js', promise new Promise(resolve => { It need to be in dependencies, devDependencies or peerDependencies. However, in our case, the auth-lib is just a library in our monorepo. Setting eager: true for dependency via the ModuleFederationPlugin. 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. The problem is that Next.js has no async boundary internally. As shown below, multiple teams were still responsible for individual parts of the Tenable.io application. Manfred Steyer Trainer and Consultant with focus on Angular The application shell is also a separate build referencing all pages as remote modules. 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. You have a host app hosted on https://my-host.com/app/* and a child app hosted on https://foo-app.com. They usually point to the same module in each build, e.g. However, you can expose as much or as little as you want based on your needs. Scalability - its the problem that Module Federation tries to solve. Webpack 5 Module Federation is a really useful, yet still somewhat complex approach to implement micro frontends. Step 1: In the module-federation-examples/basic-host-remote/app2 directory, execute npm start. Hence, both, the shell and the Micro Frontend have their very own copy of these services and this is something, no one is expecting. Module Federation shared deep dependency resolved incorrectly. The container interface supports get and init methods. To make configuring such cases a bit easier as well as to prevent issues with the Angular compiler, @angular-architects/module-federation provides a configuration property called: Important: Since Version 14.3, the withModuleFederationPlugin helper automatically shares all mapped paths if you dont use the property sharedMappings at all. We distinguish between local and remote modules. If you're going to load multiple modules from different remotes, it's advised to set the output.uniqueName option for your remote builds to avoid collisions between multiple webpack runtimes. However, you know what they say: Beware of your wishes. Budget-wise solutions for small to medium-sized businesses. The Angular team has adapted the HttpClient for the new standalone components. In dieser Schulung lernst du von bekannten Insidern und Experten der ersten Stunde anhand vieler Beispiele, wie du mit Angular erfolgreich moderne Anwendungen entwickelst. You do not use webpack as a module bundler (Module Federation is a webpack 5 feature) You require an old Angular version < 11.0.0 ( Angular 11 first has opt-in support for Webpack 5) I strongly recommend to stick with a different integration pattern in your Microfrontend architecture if one or more of the points above apply to your project. In a nutshell, it is webpacks way of implementing a micro-frontend (though its not limited to only implementing frontend systems). These separate builds should not have dependencies between each other, so they can be developed and deployed individually. Before You Proceed: The remainder of this article is very technical in nature and is geared towards engineers who wish to learn more about how module federation works and the way in which things can be set up. The serve command above listens for that message (line 26 above) and uses it to keep track of when a particular micro-app is done compiling. const version = urlParams.get('app1VersionParam') It's synchronous nature means that currently there is no way to wait for container negotiations to take place between runtimes, limiting the possibilities of using module federation with Next.js apps. To demonstrate this situation, lets install @angular/material and @angular/cdk in a version that is at least 2 versions behind our Angular version. 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. 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. 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. Advanced API in Webpack 5..-beta.17. Also, this duplicates all shared services registered for the root scope, e. g. with providedIn: 'root'. init: (arg) => { Since version 12.3, @angular-architects/module-federation comes with an unspectacular looking helper function called shared. Datenschutz. This way, evaluation order is unaffected by converting a module from local to remote or the other way around. 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. Within ModuleFederationPlugin. live preview Check out this live module federation example on StackBlitz. The application shell is deployed when routes are updated or new routes are added. resolve(proxy) "Practical Module Federation" is the first, and only, book on Webpack 5's innovative new live code sharing mechanism. This package was previously available for $40 (USD) on PrivJS with over 92k downloads. 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. However, @angular/common itself is not a dependency of @angular/common and hence, the version cannot be found. Notice when we navigate to the /profile route, we see a console error. This will install wepback and the dependencies we need for our webpack configuration. I have two microfrontends applications (Host and Product) in angular v.13 and using the concept of module federation with webpack 5. Fortunately, Module Federation got us covered with such scenarios. It is possible to nest a container. For large enterprises . According to which criteria can we sub-divide a huge application into Micro Frontends? Module Federation is a type of JavaScript architecture I invented and prototyped. According to their documentation, "Remote modules are modules that are not part of the current build and loaded from a so . You will find yourself repeating the same configuration over and over again. Since Angular 14.2, it's possible to use Standalone Components as Angular Elements. This module should only be imported in your shell application's root module. This allowed us to speed up our boot time by 2x and our rebuild time by 7x, which was a significant improvement. 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. In our setup, we want to prevent micro-applications from importing resources from each other; if they need to share code, it should come from the libs directory.
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