The Status of Micro Frontends

@ManfredSteyer ManfredSteyer The Status of Micro Frontends Manfred Steyer, ANGULARarchitects.io

@ManfredSteyer Booking App Booking App Check-in App Check-in App Boarding
App Boarding App Luggage App Luggage App

@ManfredSteyer

@ManfredSteyer ✓Hyperlinks ✓Server-Side Includes ✓Server-Side orchestration

@ManfredSteyer The Final Frontier

@ManfredSteyer ▪ Loading into Browser ▪ Bundle Size ▪ Version
Conflicts

@ManfredSteyer #1 Analysis #2 Implementation

@ManfredSteyer Manfred Steyer

@ManfredSteyer

@ManfredSteyer Which one is the best?

@ManfredSteyer It’s all about consequences in your very situation!

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@ManfredSteyer • Autarkic teams, so that … • it's possible
to do changes w/o coordinating with other teams • own architectural decisions • Migrating step by step to new tech stacks : • Fully consistent design • Bundle size

@ManfredSteyer Booking Booking Check-in Check-in Boarding Boarding Luggage Luggage

@ManfredSteyer Should mirror a real-world business domain Large enough: Most
use cases don't overlap domains Small enough: One team can handle it

@ManfredSteyer

@ManfredSteyer Monorepo Structure

@ManfredSteyer https://nrwl.io/nx

@ManfredSteyer Visualize Module Structure

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@ManfredSteyer µFrontend µFrontend µFrontend

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@ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp
Shell

@ManfredSteyer • iframes (very present) • Web Components (a bit)

@ManfredSteyer const Component = await import('other-app/cmp');

@ManfredSteyer Shell (Host) Microfrontend (Remote) // Maps Urls in //
webpack config remotes: { mfe1: "http://..." } // Expose files in // webpack config exposes: { './Cmp': './my.cmp.ts' } import('mfe1/Cmp')

@ManfredSteyer How to Get the Microfrontend's URL? Shell (Host) Microfrontend
(Remote) RemoteEntry.js <script src="…"></script>

@ManfredSteyer Shell (Host) Microfrontend (Remote) shared: [ "@angular/core", "…" ]
shared: [ "@angular/core", "…" ]

@ManfredSteyer Selecting the highest compatible version 10.0 10.1

@ManfredSteyer Compiled app code is not officially backwards compatible

@ManfredSteyer Conflict: No highest compatible version 11.0 10.1

@ManfredSteyer

@ManfredSteyer Booking Booking Boarding Boarding Shared Shared Feature Feature Feature
Feature Feature Feature Feature Feature Feature Feature … … … … … … … … … … … … … … … … … … Booking App Booking App Boarding App Boarding App Publish shared libs seperately via npm Repository n Repository 2 Repository 1 Version Mismatches? Strict Borders

@ManfredSteyer Booking Booking Boarding Boarding Shared Shared Feature Feature Feature
Feature Feature Feature Feature Feature Feature Feature … … … … … … … … … … … … … … … … … … Booking App Booking App Boarding App Boarding App

@ManfredSteyer Decoupling: Access Restrictions/ Linting (Nx) Separate Deployment* No Version
Conflicts (just one version!)

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@ManfredSteyer Hyperlinks µFrontend µFrontend µFrontend

@ManfredSteyer <iframe></iframe>

@ManfredSteyer

@ManfredSteyer Abstracting away differences b/w frameworks Shadow DOM Properties/ Events

@ManfredSteyer

@ManfredSteyer const Component = await import('other-app/cmp');

@ManfredSteyer const main = await import('other-app/main'); main.bootstrap();

@ManfredSteyer const main = await import('other-app/main'); main.bootstrap(); const rootElm =
document.createElement('app-root') document.body.appendChild(rootElm);

@ManfredSteyer await import('other-app/main'); // Self-Bootstrapping const rootElm = document.createElement('app-root') document.body.appendChild(rootElm);

@ManfredSteyer await import('other-app/main'); const rootElm = document.createElement('app-root') document.body.appendChild(rootElm); WrapperComponent

@ManfredSteyer

@ManfredSteyer https://red-ocean-0fe4c4610.azurestaticapps.net

@ManfredSteyer Free eBook ANGULARarchitects.io/book Updated for Module Federation and Alternatives

@ManfredSteyer Conclusion Know your architecture goals + Evaluate! Know your
architecture goals + Evaluate! Moduliths vs. Micro Frontends Moduliths vs. Micro Frontends Monorepo vs. multiple repos Monorepo vs. multiple repos Module Federation: Tempting Module Federation: Tempting

@ManfredSteyer d Slides & Examples Remote Company Workshops and Consulting
http://angulararchitects.io

The Status of Micro Frontends

The Status of Micro Frontends

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