The Microfrontend Revolution Module Federation with Angular @Jax2020

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@ManfredSteyer ManfredSteyer The Microfrontend Revolution Module Federation with Angular Manfred Steyer, ANGULARarchitects.io

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@ManfredSteyer Do you remember her? Bonnie Barstow, PhD

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@ManfredSteyer Software Engineering is a Team Sport

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@ManfredSteyer Coordination b/w Teams

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@ManfredSteyer Monolith Flight System

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@ManfredSteyer Booking Service Check-in Service Boarding Service Luggage Service Microservices Sub-Domains (DDD)

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

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer Contents #1: Consequences of Microfrontends #2: Module Federation #3: Dynamic Module Federation #4: Version Mismatch #5: Possible Roadmap

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@ManfredSteyer Manfred Steyer

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@ManfredSteyer

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

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@ManfredSteyer Autonomous Teams Separate Development Separate Deployment Own architecture decisions Own technology descisions

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer Challenges UI Composition UI Consistency Bundle Size/ Sharing Dependencies Version Conflicts between Microfrontends …

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@ManfredSteyer Module Federation Solves Some of Them! UI Composition UI Consistency Bundle Size/ Sharing Dependencies Version Conflicts between Microfrontends …

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer Idea const Component = await import('http://other-app/xyz') Does not work with webpack/ Angular CLI Even lazy parts must be known at compile time!

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@ManfredSteyer Webpack 5 Module Federation Shell (Host) Microfrontend (Remote) // Maps Urls in // webpack config remotes: { mfe1: "mfe1" } // Expose files in // webpack config exposes: { Cmp: './my.cmp.ts' } import('mfe1/Cmp')

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@ManfredSteyer How to Get the Microfrontend's URL? Shell (Host) Microfrontend (Remote) RemoteEntrypoint.js

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@ManfredSteyer How to Share Libs? Shell (Host) Microfrontend (Remote) shared: [ "@angular/core", "…" ] shared: [ "@angular/core", "…" ]

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer Dynamic Module Federation Shell (Host) Microfrontend (Remote) remotes: { mfe1: "mfe1" } exposes: { Cmp: './my.cmp.ts' } import('mfe1/Cmp')

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@ManfredSteyer Dynamic Module Federation Shell (Host) Microfrontend (Remote) remotes: { } exposes: { Cmp: './my.cmp.ts' } import('mfe1/Cmp')

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@ManfredSteyer Dynamic Module Federation Shell (Host) Microfrontend (Remote) remotes: { } exposes: { Cmp: './my.cmp.ts' } loadRemoteModule({ remoteEntry: 'http://…', remoteName: 'mfe1', exposedModule: './Cmp' })

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@ManfredSteyer

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@ManfredSteyer

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@ManfredSteyer Dealing with Version Mismatch SemVer by Default: Highest compatiable version Fallback: Use own version Relaxing: Configure a range of accepted versions Singleton: Warning or error

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@ManfredSteyer Configuring Singletons shared: { "my-lib": { singleton: true, strictVersion: true // Error instead of warning! } }

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@ManfredSteyer Relaxing Version Requirements shared: { "my-lib": { requiredVersion: ">=1.0.1 <11.1.1" } }

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@ManfredSteyer

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@ManfredSteyer Well … Webpack 5 is currently beta Shown examples: PoC w/ custom webpack conf + patched CLI lib CLI: Not before version 11 (fall 2020) Squeeze federation config into CLI's webpack config Custom Builder (e. g. ngx-build-plus)

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

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@ManfredSteyer Conclusion Main Purpose of µFrontends: Scaling Teams Decoupling Federation: Import From Other App Sharing Libs Take Care of Conflicts

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@ManfredSteyer Be like Bonnie and think first! Evaluate whether you need µFrontends No: Majestic Monolith Yes: Consider Module Federation

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