Micro Frontends with Angular: Module Federation Deep Dive @ngBe

@ManfredSteyer ManfredSteyer Micro Frontends with Angular: Module Federation Deep Dive
Manfred Steyer, ANGULARarchitects.io

@ManfredSteyer

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

@ManfredSteyer Micro Frontends

@ManfredSteyer

@ManfredSteyer Contents #1: Module Federation #2: Federated Angular #3: Dynamic
Module Federation #4: Communication b/w MF #5 Version Mismatch #6: Multi Framework/ Version MF #7: Possible Roadmap

@ManfredSteyer Manfred Steyer

@ManfredSteyer

@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!

@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')

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

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

@ManfredSteyer

@ManfredSteyer ?

@ManfredSteyer Custom Builder

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@ManfredSteyer 1) ng add @angular-architects/module-federation 2) Adjust generated configuration 3)
ng serve

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

} exposes: { Cmp: './my.cmp.ts' } import('mfe1/Cmp')

} exposes: { Cmp: './my.cmp.ts' } loadRemoteModule({ remoteEntry: 'http://…', remoteName: 'mfe1', exposedModule: './Cmp' })

} exposes: { Cmp: './my.cmp.ts' } loadRemoteModule({ remoteEntry: 'http://…', remoteName: 'mfe1', exposedModule: './Cmp' }) Helper Function using the Webpack API

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

@ManfredSteyer Example for SemVer and Fallback • Shell: my-lib: ^10.0.0
• MFE1: my-lib: ^10.1.1 • MFE2: my-lib: ^9.0.0 Result: • Shell and MFE1 share ^10.1.1 • MFE2 falls back to its own version ^9.0.0

@ManfredSteyer However … • Shell: my-lib: ^10.0.0 • MFE1: my-lib:
^10.1.1 + MFE1: Dynamic Federation + Loading metadata too late Result: • Shell uses ^10.0.0 • MFE1 falls back to its own version ^10.1.1

@ManfredSteyer However … • Shell: my-lib: ^10.1.1 • MFE1: my-lib:
^10.0.0 + MFE1: Dynamic Federation + Loading metadata too late Result: • Shell and MFE1 share ^10.1.1

@ManfredSteyer Recommentation for Dynamic Federation Make sure, shell has highest
versions Or: Load metadata upfront!

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

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

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@ManfredSteyer Key Idea Share a Lib with a Communication Service
Message Passing? Separate Lib or Monorepo

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@ManfredSteyer Key Idea Expose Web Components via Module Federation However:
Bundle Size & Workarounds

@ManfredSteyer Example

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@ManfredSteyer Well … Webpack 5 is final! CLI is final
However: webpack5/CLI integration is experimental! https://github.com/angular/angular-cli/pull/18873 See Pitfalls: https://tinyurl.com/y8e57ol9

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

@ManfredSteyer Conclusion Module Federation Loading Separately Deployed Code Federated Angular
Dynamic Federation Version Mismatches Multi Framework/ Version ?

@ManfredSteyer

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

Micro Frontends with Angular: Module Federation...

Micro Frontends with Angular: Module Federation Deep Dive @ngBe

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