MICROFRONTENDS

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BY

Surprisingly Easy Way To Build

WITH ANGULAR

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TOMAS TRAJAN

CONSULTANT, ANGULAR TRAINER, BLOGGER, SPEAKER...

INTERNATIONAL SPEAKER

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ANGULAR

TRAINER

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ANGULAR BLOG

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🔗 github.com/tomastrajan

✅ best practices

✅ Angular Material components

✅ NgRx 8 state management

✅ theming support

✅ 30+ contributors

✅ unit / e2e testing

ANGULAR STARTER

1800+

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@releasebutler

MAKER OF

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TELL ME ABOUT YOURSELF

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REFRESHER

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VANILLA WEB

🍜SPAGHETTI CODE

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COMPONENTS*

CREATED WITH THE HELP OF FRONTEND FRAMEWORKS AND LIBRARIES....

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<p>          vs        <todo-item>

  • show text
  • use styling
  • some css animations
  • show text
  • use styling
  • some css animations
  • toggle
  • assign to user
  • set deadline
  • tag
  • ....

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COMPONENTS

  • re-usability
  • encapsulation
  • reduction of complexity
  • framework / library specific
  • not reusable across projects

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WEBCOMPONENTS

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...GETS CRAZY

             PRETTY FAST

  • vanilla DOM APIs
  • manual management of props and attributes
  • life-cycle hooks
  • by default only primitive values in attributes
  • custom events are verbose
  • methods vs declarative data passing

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BUT...

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WEB COMPONENTS

  • more reusable
  • framework independent
  • better encapsulation (shadow DOM)
  • future proof (in theory)

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ANGULAR ELEMENTS

...AKA WRITE ANGULAR AND GET VANILLA WEBCOMPONENTS

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ANGULAR ELEMENTS

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ANGULAR ELEMENTS

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STORY TIME

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THE  MONOLITH

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THE 80+

ANGULAR SPAS

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library

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library

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THE LIB

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ELEMENTS ALREADY WORK SO WHY LIB?

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BY DEFAULT WE HAVE 2 OPTIONS

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👎 EAGER LOADING

👍 STANDARD ANGULAR 

         TEMPLATE BINDINGS

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👍 LAZY LOADING

👎IMPERATIVE AttRIbuTE

        AND EVENT BINDING

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WHAT WE WANT?

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LAZY LOADING

&

STANDARD ANGULAR TEMPLATE BINDINGS

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👍 LAZY LOADING

👍 STANDARD ANGULAR 

         TEMPLATE BINDINGS

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HOW DOES IT WORK?

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  • The * signifies Angular structural directive
  • The element is removed from the DOM
  • Directive can inject the element template reference in its constructor
  • And use it to render element back once the elements bundle was loaded!

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STANDARD ANGULAR DIRECTIVE

SIMPLIFIED VERSION 😅

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RETRIEVE URL

<some-component 
  *axLazyElement="https://my-org.com/some-component.js">
</some-component>

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INJECT TEMPLATE REFERENCE

...AND A SERVICE WHICH

   IMPLEMENTS ELEMENT

   LOADING (CREATE SCRIPT TAG)

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RETRIEVE ELEMENT TAG FROM THE TEMPLATE

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CALL LOADER SERVICE WITH URL & TAG

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ONCE LOADED, RENDER TEMPLATE BACK TO THE DOM

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AND HANDLE POTENTIAL ERRORS 😉

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 BUT WHAT ABOUT THE SERVICE?

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STANDARD ANGULAR SERVICE

VERY SIMPLIFIED VERSION 😅

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CREATE URL / PROMISE MAP

TO PREVENT MULTIPLE DOWNLOADS OF A SINGLE ELEMENT BUNDLE!

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ADD LOADELEMENT METHOD AS USED IN THE *AXLAZYELEMENT DIRECTIVE

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WHEN LOADING, FIRST CHECK IF WE ALREADY HAVE SUCH AN URL IN THE REGISTRY...

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AND IF CASE IF YES RETURN THE STORED PROMISE

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ELSE WE HAVE TO DOWNLOAD ELEMENTS BUNDLE FOR THE FIRST TIME

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IMMEDIATELY STORE URL & THE NEW PROMISE IN THE REGISTRY...

NEXT, we want to DOWNLOAD THE ELEMENT BUNDLE USING <SCRIPT> TAG

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...NOTIFY THE PROMISE ONCE LOADED (or ERROR)

... SET ELEMENT BUNDLE URL

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...APPEND THE SCRIPT TAG TO TRIGGER LOADING

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...AND RETURN THE PROMISE!

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BY THE WAY...

THIS ALSO WORKS WITH ANGULAR IVY🌿

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WE SAID ITS LAZY, BUT HOW LAZY?!

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THE ELEMENT IS HIDDEN BEHING *ngIF

WHEN IT WILL BE LOADED?

WHAT DO YOU THINK?😉

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THAT's RIGHT...

THE ELEMENT BUNDLE WILL BE LOADED ONLY ONCE THE *NGIF EVALUATES TO TRUE AND ELEMENT IS RENDERED!

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SO YEAH, AS LAZY AS IT GETS 😹

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DEVELOPER EXPERIENCE

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CONFIGURATION

PRE-CONFIGURE URL

LOADING & ERROR STATE COMPONENTS...

AND EVEN PRE-LOADING!

PER MODULE...

AND USE WITH EASE!

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CONFIGURATION

POSSIBLE TO OVERRIDE LOCALLY IN THE TEMPLATE

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BACK TO OUR REQUIREMENT...

👍 SOLVED  !

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COOL, BUT THAT'S NOT REALLY MICROFRONTENDS, RIGHT?

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COMMUNITY FEEDBACK

THIS NEEDS TO BE MORE DYNAMIC!

I WANT LOAD CONFIG FROM BACKEND DURING RUNTIME!

I WANT TO CONFIGURE TAG USING A VARIABLE

WE WANT TO BUILD MICROFRONTEEEENDS!

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OK...

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HERE YOU GO...

DYNAMIC TAG

STANDARD ANguLAR TEMPLATE BINDING WORKS STILL!

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RETRIEVE CONFIG FROM BACKEND...

RENDER MULTIPLE DYNAMIC ELEMENTS...

CONFIG EXAMPLE...

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HOW DOES IT WORK?

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ALMOST THE SAME AS         

    *AXLAZYELEMENT BUT...

WE HAVE TO OVERRIDE ELEMENT NAME IN THE TEMPLATE...

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UNFORTUNATELLY...

NOT YET READY FOR ANGULAR IVY🌿

BUT...

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IT SHOULD BE POSSIBLE USING IVY RENDERER

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KNOWN ISSUES ?

WITH ZONE.js...

STORE PARENT ZONE ON THE WINDOW...

... and pass it into element AT bootstrap

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QUICK DEMO TIME

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LEARN MORE

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GET IN TOUCH 

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GET IN TOUCH

npx tomastrajan

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TAKEAWAYS

There are many real world use cases 

ANGULAR IS A GREAT CHOICE FOR MICROFRONTENDs

CHECK OUT @ANGULAR-EXTENSIONS/ELEMENTS LIB

ALSO LET'S MEET AND CHAT ABOUT

@tomastrajan

 THANK YOU FOR YOUR ATTENTION!

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Angular Elements - Microfrontends

By Tomáš Trajan

Angular Elements - Microfrontends

Talk about the best way how to lazy load Angular Elements and how to use it to build dynamic configurable microfrontends

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