This approach is good for prototyping, but it will not allow you to scale to large production environment given that libraries like react and react-dom will require additional requirements. both app.component.ts files are identical. Module Federation Sharing Library Code; . Webpack Module Federation finally provides a simple and solid solution for this. Is cycling an aerobic or anaerobic exercise? Subscribe to our newsletter to get all the information about Angular. . Where the library would be, in the first place? Setup Since this post is about showcasing a component UI library, I am going to skip some of the setup boilerplate explained in my last post and walk you through what we're working with. This syntax allows you to share libraries with package name only. next step on music theory as a guitar player. How can we avoid pitfalls when working with Module Federation. LO Writer: Easiest way to put line of words into table as rows (list). Connect and share knowledge within a single location that is structured and easy to search. All of this was done by the @angular-architects/module-federation plugin. I can't figure out how to share a singleton service from a shared local Angular library between my two apps. Generally speaking, we're using this to point to code that is bundled into our app by Webpack. The property shared defines the npm packages to be shared between the shell and the microfrontend(s). I see "constructed SharedService" logged on app load, then again as soon as the remote module is loaded. Whats New in our Module Federation Plugin 14.3? Manfred Steyer Trainer and Consultant with focus on Angular This prevents several issues. The code you normally find in the file main.ts was moved to the bootstrap.ts file loaded here. This is often known as Micro-Frontends, but is not limited to that. Making statements based on opinion; back them up with references or personal experience. Each project exposes code that will be consumed by others. The consumer in this sense is the federated project (shell or Micro Frontend) or a shared library. Step 1 will be done during the chunk loading. The package @angular-architects/module-federation provides such a custom builder. While specifying the remote entrys URL that way is convenient for development, we need a more dynamic approach for production. In this section, you are going to create a shared library where you will add the logic to dynamically load federated modules when needed. While its obvious that the project shell contains the code for the shell, mfe1 stands for Micro Frontend 1. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. There is active webpack bug regarding that. Creating a federated UI library this way works really well, and something that I feel could be quite advantageous for larger teams working with Single Page Applications wanting to have an option to NPM or the like. Step 5: Add a Shared Library to Hold Module Federation Operation. In my previous article, Ive shown how to use Module Federation which is part of webpack beginning with version 5 to implement microfrontends. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How do I simplify/combine these two methods for finding the smallest and largest int in an array? rev2022.11.3.43005. Like always, the code for this example is at my Github in case you feel like checking that out. I'm working on a new project using Angular 11 and Webpack 5. Big thanks to Zack Jackson, the mastermind behind Module Federation, who helped me bypassing some pitfalls. Array syntax This syntax allows you to share libraries with package name only. However, it might lead to too much shared bundles. Also, the microfrontend can be used without the shell: The case study presented here assumes that both, the shell and the microfrontend are projects in the same Angular workspace. Module Federation is really clever when it comes to auto-detecting details and compensating for version mismatches. While this helps to quickly get a working setup, it might lead to too much shared dependencies. Please note that the webpack.config.js is only a partial webpack configuration. The combination of singleton: true and strictVersion: true makes webpack emit a runtime error when the shell and the micro frontend(s) need different incompetible versions (e. g. two different major versions). (The value for this hint defaults to the property name.). When webpack goes to bundle the code it needs to be able to find it. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. More information about dealing with version mismatches can found in a further article of this series. Why does the sentence uses a question form, but it is put a period in the end? If the shell, for instance, is using version 12.0 and one of the micro frontends is already built with version 12.1, it will decide to load the latter one. This hint will allow webpack to include the provided and fallback module directly instead of fetching the library via an asynchronous request. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Would it be illegal for me to act as a Civillian Traffic Enforcer? One also has to deal with possible version conflicts. Can an autistic person with difficulty making eye contact survive in the workplace? While this doen't seem to make a lot of sense at first glance, it's a typical pattern you find in Module Federation-based applications. Let's explore some of the patterns and use-cases for module federation. I can't find any "exposes" section for libraries. The Angular team has adapted the HttpClient for the new standalone components. 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). I didn't think to share the data access services because they are stateless, but this caused my MFEs to instantiate new singletons. However, it can . However, when dealing with it, several additional questions come in mind: Our free eBook (about 100 pages) covers all these questions and more: The implementation of microfrontends has so far involved numerous tricks and workarounds. I don't know how it would find files that are not local to the project that is being built, unless you included it as an NPM package or something. If the letter V occurs in a few native words, why isn't it included in the Irish Alphabet? Module Federation is a type of JavaScript architecture I invented and prototyped. As shared dependencies cannot be tree shaken and by default end up in separate bundles that need to be loaded, you might want to optimize this behavior by switching over from shareAll to the share helper: So far, weve seen that Module Federation is a strightforward solution for creating Micro Frontends on top of Angular. Shared Configs map.config.json contains a global object of local and remote endpoint URLs. would this work across different repositories, where configuring the 'paths' inside of tsconfig wouldn't be able to point to a path in a repository recieving a service? For getting started, we need to tell the CLI to use module federation when building them. Saving for retirement starting at 68 years old. There are three ways to specify the versions of shared libraries. This is post 2 of 10 in the series Module Federation, 2020-10-13: Updated to use webpack 5 and Angular CLI 11.0.0-next.6. At this point you should have a fairly good grasp on how both vendor libraries and custom libraries are shared in the module federation system. The dynamic import makes Module Federation to load the shared libs. In order to make module federation work, we need to bootstrap the app asynchronously. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I prefer women who cook good food, who speak three languages, and who go mountain hiking - what if it is a woman who only has one of the attributes? Eg. rev2022.11.3.43005. How to generate a horizontal histogram with words? The setup is rather straightforward and enables dynamic imports from other micro frontends in runtime. According to which criteria can we sub-divide a huge application into micro frontends? Such cases must be avoided with conventions or at least recognized as early as possible with integration tests. evaluating the module (synchronous). Take a look at the above Webpack configuration files for each project. This way, evaluation order is unaffected by converting a module from local to remote or the other way around. Each webpack build can be a host, which is a container to load other builds. How to help a successful high schooler who is failing in college? I'll do my best to explain my setup.. Real sorry about how long this is going to be. To learn more, see our tips on writing great answers. First of, lets look at the remote and the exposes properties of the UI team top to bottom: BaseStyles - e.g styles for wrapping a page, base fonts etc Components/Utils - a react specific prop sanitation utility. https://github.com/webpack/webpack/issues/15164, Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned. However, as the CLI shields webpack from us, we need a custom builder. Native Federation is a **framework- and tooling-agnostic** implementation of Module Federation. Make sure you have a fitting version if you try out the examples outlined here! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The provided module that should be placed in the shared scope. Make sure any module dependencies your shared services have are also shared. However, this approach also puts more responsibility on the developers. Workshop with strategies for your large and long-lasting business applications. // there is no version check for the required version, // so it will always use the higher version found, // it will use the highest lodash version that is >= 4.17 and < 5, // it will always use the shared version, but print a warning when the shared vue is < 2.6.5 or >= 3, // it will emit a warning if the shared vue is < 2.6.5 or >= 3, // it will throw an error when the shared vue is < 2.6.5 or >= 3, // the "vue" package will be used as a provided and fallback module, // under this name the shared module will be placed in the share scope, // share scope with this name will be used, // only a single version of the shared module is allowed, // don't use shared version when version isn't valid. Thanks for contributing an answer to Stack Overflow! Not the answer you're looking for? 2021-08-08: Updated for Angular CLI 12.x In this post we'll look into how we can use Module Federation to create a federated UI library to share with multiple teams. This is probably an argument for keeping minimal shared state/dependencies across your apps. Since this post is about showcasing a component UI library, I am going to skip some of the setup boilerplate explained in my last post and walk you through what were working with. Common dependencies like Angular or the Auth0 library can be shared and hence don't need to be loaded several times. We have to use those aliases, but tell webpack where to find the libraries by using the import option. Should we burninate the [variations] tag? This makes complete sense but i can't get it to work, If I reference the local library this way I inevitably end up with errors during builds, The examples I posted are simplified. Webpack 5 Module Federation aims to solve the sharing of modules in a distributed system, by shipping those critical shared pieces as macro or as micro as you would like. The helper function share used in this generated configuration replaces the value 'auto' with the version found in your package.json. As mentioned above, the usage of shareAll allows for a quick first setup that "just works". It allows webpack to replace lower matching versions, but not higher. So, if you run into this issue take a look at your dependencies and make sure you're sharing everything you need. The above configuration shows how to expose two different files. This provided module also acts as fallback module if no shared module is found in the shared scope or version isn't valid. 2022 Moderator Election Q&A Question Collection, Angular CLI Project Missing Module Errors After Git Pull, Could not find module "@angular-devkit/build-angular", WP5 Module Federation: Singleton instantiated multiple times, Webpack Module Federation Unsatisfied version 11.x.x of shared singleton module @angular/common (required ^7.2.0), Error when adding Datepicker to a remote component in module federation, React Module Federation - Uncaught Error: Shared module is not available for eager consumption: webpack/sharing/consume/default/react/react. Start by creating a new project folder with the following package.json to allow us to run our two SPAs at the same time: Thanks for contributing an answer to Stack Overflow! This is particularly important in angular for things like global auth services. This is a tiny file generated by webpack when building the remote. 2022 Moderator Election Q&A Question Collection, Could not find module "@angular-devkit/build-angular", WP5 Module Federation: Singleton instantiated multiple times, Webpack Module Federation Unsatisfied version 11.x.x of shared singleton module @angular/common (required ^7.2.0), Module federation display a blank page for a few seconds when a remote is unavailable. I had to share the @angular/material/icon specifically to share the singleton across every MFE. The rest is generated by the CLI as usual. This must be because the shared services had 'unshared' dependencies. To learn more about Module Federation, review the technology's website. Lets start with the shell which would also be called the host in module federation. In this training, you will learn from well-known insiders and experts from the very beginning, using many examples, how to successfully develop modern applications with. The structure will be different . In C, why limit || and && to evaluate to booleans? I tried to follow another example by ScriptedAlchemy, but I can't figure out how to make it work. This is only needed when the package name can't be automatically determined from request. When you apply the same sort of diagram shown above for this app, it looks like this: . The reason for this duplication is that Module Federation generates a bundle per shared library per consumer. Some libraries use a global internal state (e.g. I am basing my work on Manfred Steyer's Module Federation Plugin Example repo, which uses Angular CLI. This approach is good for prototyping, but it will not allow you to scale to large production environment given that libraries like react and react-dom will require additional requirements. 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Best way to get consistent results when baking a purposely underbaked mud cake. But have you had a look into your main.ts? Assigning a new port for ng serve so that several projects can be served simultaneously. SQL PostgreSQL add attribute from polygon to all points inside polygon but keep all points not just those that fall inside polygon. Step 2 will be done during the module evaluation interleaved with other (local and remote) modules. This hint only allows a single version of the shared module in the shared scope (disabled by default). I can't figure out how to share the same instance of an injectable service across federated Angular modules in a CLI project. The overhead to maintain "shared component libraries" and sync versions and experiences across micro-frontends is also greatly reduced. 2021-12-23: Updated for Angular CLI 13.1.x Laberweinting Weather Forecasts. Is it considered harrassment in the US to call a black man the N-word? sites contains both the consuming app and the ui library, Consumer "Home" application using the shared ui library and aliases it as, Header component example using the federated, "concurrently \"wsrun --parallel start\"", "rm -fr node_modules sites/**/node_modules && yarn run clean:dist", "ui@http://localhost:5000/remoteEntry.js", "ui@http://localhost:3001/remoteEntry.js", Showcases all available UI components by exposing micro-frontend called. While this doent seem to make a lot of sense at first glance, its a typical pattern you find in Module Federation-based applications. The requested shared module is looked up under this key from the shared scope. In other words, this allows to use this shared module in the initial chunk. My second problem was that I was attempting to share common facades that depended on common data access services. The shared library contains code and application state we want to share across the site. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. is a trainer and consultant with a focus on Angular. It has routes defined within in the AppModule: In order to make it possible to load the FlightsModule into the shell, we also need to expose it via the remotes webpack configuration: The configuration shown here exposes the FlightsModule under the public name Module. You may not even realize that you have two instances of a shared service at first. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Connect and share knowledge within a single location that is structured and easy to search. Where in the cochlea are frequencies below 200Hz detected? Making statements based on opinion; back them up with references or personal experience. "singleton:true" shares the same instance of the shared module across your federated modules. What is the deepest Stockfish evaluation of the standard initial position that has ever been done? That solved the issues I was having with Webpack being unable to find modules at compile time. It uses the router to lazy load a FlightModule: However, the path mfe1/Module which is imported here, does not exist within the shell. All of this was done by the @angular-architects/module-federation plugin. The first HomeComponent exposes a single Angular Component file while the second ShellModule exposes a module. Thus, it is critical to have only one instance of the library running at a time. Finding features that intersect QgsRectangle but are not equal to themselves using PyQGIS. Correct handling of negative chapter numbers, next step on music theory as a guitar player, Water leaving the house when water cut off. Webpack Module Federation Unsatisfied version 11.x.x of shared singleton module @angular/common (required ^7.2.0) 2 Module federation display a blank page for a few seconds when a remote is unavailable This is a part of our architecture which we're not completely sure scales well. To look up the needed meta data for this decision, Module Fedaration squeezes itself into dynamic imports like this one here. There are three ways to specify the versions of shared libraries. Hopefully not overly so, but here is a link to a repo that shows the issue. Low-level concepts We distinguish between . There are three ways to specify the versions of shared libraries. These separate builds should not have dependencies between each other, so they can be developed and deployed individually. More details on this can be found in another article of this series. Is a planet-sized magnet a good interstellar weapon? If we skipped strictVersion or set it to false, webpack would only emit a warning at runtime. Important: This article is written for Angular and Angular CLI 14 and higher. Do you have a full example you can share? 2022-06-06: Updated for Angular CLI 14.x and above. What is the effect of cycling on weight loss? To ease the TypeScript compiler, we need a typing for it: Also, we need to tell webpack that all paths starting with mfe1 are pointing to an other project. It is possible to nest a container. To improve performance, libraries can be shared and strategies for dealing with incompatible versions can be configured. main renders modules from the remote menu and a module from the appropriate micro frontend, in this illustration subscriptions. This file is where we add in the wiring for the hosts, remotes, shared code, and shared dependencies in the Module Federation plugin. The reason is that Module Federation needs to decide which version of a shared library to load. Found footage movie where teens get superpowers after getting struck by lightning? I started from a working example, then generated a new lib (ng generate library mdmf-shared) and exposed a single Injectable from the library's public-api.I import this service into my shell and my microfrontend with no . It only contains stuff to control module federation. One application can dynamically run code from another bundle or build, on the client and the server. Why is SQL Server setup recommending MAXDOP 8 here? What is the function of in ? A later section here addresses this. I'm using (at the moment) Angular 11.0.0-next and Webpack 5, which is only available as an opt-in with ng11 . Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Laberweinting area. It looks up the used version in your package.json. The . There are no errors or anything -- things just don't work like you expect. . Case Studies A Blog Utilizing This Websites Modules Make sure you've structured your shared config correctly in webpack.config.ts. Short story about skydiving while on a time dilation drug. On this occasion,. For this property, The generated configuration uses the helper method shareAll that is basically sharing all the dependencies found in your package.json. Why are only 2 out of the 3 boosters on Falcon Heavy reused? This syntax allows you to provide additional hints to each shared package where you define the package name as the key, and the value as an object containing hints to modify sharing behavior. I'm going to note that my project is an NX Monorepo using Angular CLI. It is also interesting that the microfrontends are loaded by Webpack under the hood. Does activating the pump in a vacuum chamber produce movement of the air inside? Module Federation allows loading Micro Frontends at runtime. Shared library in module federation: how to provide it? The Microfrontend Revolution: Module Federation with Angular, Angular Workshop Structured Introduction, 3 days or 4 days (depending on time model), Design with System: Scalable Design Systems with Storybook and Angular, Reactive Angular Architectures with RxJS and NGRX (Redux), Professional NGRX: Advanced Topics & 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, 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, Pitfalls with Module Federation and Angular, Multi-Framework and -Version Micro Frontends with Module Federation: Your 4 Steps Guide, Module Federation with Angulars Standalone Components. This hint allows webpack to reject the shared module if version is not valid (defaults to true when local fallback module is available and shared module is not a singleton, otherwise false, it has no effect if there is no required version specified). The next article in this series provides a solution for this: Dynamic Federation. react, react-dom). Data Protectin. Make a wide rectangle out of T-Pipes without loops, Replacing outdoor electrical box at end of conduit, What does puncturing in cryptography mean. To get started, you can just "ng add" it to your projects: If you use Nx, you should npm install the library separately. To learn more, see our tips on writing great answers. Hence, we need to move the bootstrap logic into a new bootstrap.ts and import it via a dynamic import in the main.ts. In my app I populate the MatIconRegistry with icons that every app needs. Make sure you've structured your shared config correctly in. 18. Evergreen Design System/Component Library An evergreen remote is one of the simplest types of federated applicationa shared remote, such as a Design System or a Component library, gets independently released, which automatically updates it for all consumers. The section shared points to the libraries shared with the shell. Its just a virtual path pointing to another project. In my project I have some library aliases like the following, To make this work in my webpack config. We've also used the main federated module as a shared library for all of our applications. Module Federation Motivation Multiple separate builds should form a single application. to share layout components or formatting utilities. Just as last time we're using a monorepo for convenience and an app shell containing two routes - the base route and the ui catalog route. For example, it is likely that components that were compiled with completely different Angular versions will not work together at runtime. I have setup a project with module federation: As you can see each micro-frontend has the angular core shared (along with other libs). What is the best way to show results of a multiple-choice quiz where multiple options may be right? Does the Fog Cloud spell work in conjunction with the Blind Fighting fighting style the way I think it does? Is there a trick for softening butter quickly? This article brings Angular into play and shows how to create an Angular-based microfrontend shell using the router to lazy load a separately compiled, and deployed microfrontend. Hence, Module Federation can decide on the versions to use and actually load them. To try everything out, we just need to start the shell and the microfrontend: Then, when clicking on Flights in the shell, the micro frontend is loaded: Hint: You can also use the npm script run:all the plugin installs with its ng-add and init schematics: To just start a few applications, add their names as command line arguments: Ok, that worked quite well. This is a typical pattern when using Module Federation. This approach is good for prototyping, but it will not allow you to scale to large production environment given that libraries like react and react-dom will require additional requirements. I might not be understanding the question tho. The reason is that Module Federation needs to decide which version of a shared library to load. live preview Check out this live module federation example on StackBlitz. Stack Overflow for Teams is moving to its own domain! I hereby agree that software architect can process my email address for the purpose of sending the newsletter. The issue of dependencies is the most important thing here, because it's harder to debug. Why is proving something is NP-complete useful, and where can I use it? He studied part-time IT and IT marketing in Graz and part-time computer science in Hagen and completed a four-semester training in the field of adult education. Installing a custom builder making webpack within the CLI use the generated. This syntax provides you more control over each shared library in which you can define package name as the key and version (semver) as the value. So this is actualy Application 1 webpack config, as it exposes the Form component, and if any other Application like Application 2 wants to consume this component, it also needs to use the Module Federation Plugin but in order to consume the component. This simplifies the use of module federation and the resulting source code, which does not require additional microfrontend frameworks. @Mike what "singleton: true" is used for ?