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Orders

Fully functional Angular app as Web Component / Custom Element

Can be hosted separately and referenced at runtime in Envelope app.

Technologies and tools used

Current status:

  • ✔️ Angular 8
  • ✔️ Lazy loading
  • ✔️ Lightweight bundles, size of micro app reduced to minimum
Details 
Date: 2019-06-17T17:43:28.547Z
Hash: 0cbd6d10ab88118ad039
Time: 6103ms
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chunk {4} 4-es5.js () 4.29 kB  [rendered]
chunk {5} 5-es5.js () 1.91 kB  [rendered]
chunk {scripts} scripts.js (scripts) 13.3 kB [entry] [rendered]
                                                                               
Date: 2019-06-17T17:43:32.376Z
Hash: bd37670c2c0d70a4f024
Time: 3803ms
chunk {0} main-es2015.js (main) 9.11 kB [entry] [rendered]
chunk {1} 1-es2015.js () 3.4 kB  [rendered]
chunk {2} 2-es2015.js () 2.29 kB  [rendered]
chunk {3} 3-es2015.js () 4.16 kB  [rendered]
chunk {4} 4-es2015.js () 4.15 kB  [rendered]
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chunk {scripts} scripts.js (scripts) 13.3 kB [entry] [rendered]

image

  • ✔️ Angular router fully working (❕ with additional boilerplate)
  • ❌ Ivy compiler [not supported yet]

Pros:

  • Tiny, small projects where business cases / domains are separated (let's say, some kind of microservices on frontend),
  • Fast, independent builds and feature delivery
  • Blazing fast deployment of micro application,
  • Much less conflicts comparing to one monolith app developed by multiple teams,
  • Content not loaded, until used (lazy loading of micro applications / components, regardless of the technologies used inside),
  • Easier to remove from the entire system, easier to transfer to another,
  • Complexity of whole frontend project scales more horizontally instead of vertically,
  • Angular is not an only option.

Cons:

  • Can be sometimes too coupled to Web Component / Angular Elements specifics,
  • Boilerplate in every app to handle architecture and navigation (Angular Router is not ready for that case out of the box),
  • Requires maintenance of additional Envelope app and shared services, guards etc. which is sometimes barely related to business cases, can be time-consuming and hard to debug,
  • The less people work on the whole solution, the less it pays off,
  • Too complex and over-designed solution if whole application and business cases are quite simple.

Setup / Usage / How to

Development server

Run npm run start for a dev server. Navigate to http://localhost:4201/. The app will automatically reload if you change any of the source files. You can also test production setup running npm run start:prod

Build

Run npm run build to build the project. The build artifacts will be stored in the dist/ directory. Use npm run build:aws if you are hosting micro app just at different context (not domain) or if are using some kind of gateway also for frontend assets and relative request path contexts are forwarded deep into the infrastructure.

Serve production build statics

Run npm run server

Running unit tests

Run npm run test to execute the unit tests via Karma.

Running end-to-end tests

Run npm run e2e to execute the end-to-end tests via Protractor.

Areas for improvements

  • The less boilerplate and coupled to WC code the better