Angular for
Enterprise

Architecture

Architecture Considerations

- Dan Wahlin

Feature Modules

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Shared Code

2 kinds

App Shared Code

Projects Shared Code

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App Shared Code

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Libraries and Monorepos 

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Angular Libraries

Where search-lib is the name of your library

ng generate library search-lib

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Projects Shared Code

NPM Enterprise Registry

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Wait what!!

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Angular Libraries

PROS

  • Publish and share these libraries with other teams or projects.

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Angular Libraries

CONS

  • Link your library to your main project and rebuild it for every change.
  • You will need to keep syncing your project with the latest version of the library.

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Angular Monorepos

Monorepos are a source control pattern where essentially all the codebase lives in the same repository. All projects will always use the latest version of the code.

What is a Monorepo?

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Angular Monorepos

  • Same library version for every app.
  • Ease of maintenance: when you update a shared library, you update it for all apps.
  • No conflicts between versions.

PROS

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Where should I build my libraries?

  • Monorepos developers of a company are set to work on the same main project, no matter how large, use a monorepos.
  • If developers are set to work on different projects, teams, locations, and codebases, you may want to build each library in their own repository.

Be careful when using libraries

  • Every shared lib needs to have its own CI/CD pipeline.
  • Each CI/CD pipeline should handle versioning of changes.
  • Every time a new change happens in a shared repo, you need to go to all your projects using this library and update their npm packages.
  • There can be mismatches with different npm packages for angular projects.

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Getting started with Nx

npm install -g @nrwl/schematics
npx create-nx-workspace@latest thisdot

Install Nx globally

Create a Nx Workspace

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Creating an App

Add the capability to create Angular applications via:

ng add @nrwl/angular --defaults

Now create your Angular app

ng g @nrwl/angular:application employees

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Nx Workspace structure

Angular apps go here

Libraries used by your Angular apps go here

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Project structure

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Getting started with Nx

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Employee's Interface

In your command line

ng g @nrwl/workspace:lib employee

Go to libs/data/src/lib/employee.ts

export interface Employee {
  id: number;
  name: string;
}

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Creating a UI Library

ng g @nrwl/angular:lib ui

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Component in our Library

ng g component employee-list --project=ui --export

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index.ts file

export * from './lib/ui.module';
export * from './lib/employee.service';

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ui.module.ts

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { EmployeeListComponent } from './employee-list/employee-list.component';

@NgModule({
  imports: [CommonModule],
  declarations: [EmployeeListComponent],
  exports: [EmployeeListComponent]
})
export class UiModule {}

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UI Libray

apps/employees/src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { RouterModule } from '@angular/router';
import { HttpClientModule } from '@angular/common/http';
import { UiModule } from '@thisdot/ui';

@NgModule({
  declarations: [AppComponent],
  imports: [
    UiModule,
    HttpClientModule,
    BrowserModule,
    RouterModule.forRoot([], { initialNavigation: 'enabled' })
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule {}

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app.component.html

<div class="employees-container">
  <img src="../assets/images/logotdm.png" />
  <h1>Employees</h1>
  <thisdot-employee-list 
  [employees]="employeeService.employees$ | async">
  </thisdot-employee-list>
</div>

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Share assets

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Share assets

"assets": [
             "apps/employees/src/favicon.ico",
              "apps/employees/src/assets",
            {
              "glob": "**/*",
              "input": "./libs/ui/src/lib/shared-assets",
              "output": "./assets"
            }
          ]

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Lazy Loading

Lazy Loading

Type

E-V-E-R-Y  T-H-I-N-G

Typescript Entities

  • classes
  • enums
  • interfaces (and types)

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NEVER USE ANY

tasks$: Observable<Task[]>;
tasks$: any;

tasks$: Observable<any[]>;

DO IT

DON'T IT 

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RxJS

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RxJS

  • Declarative approach.
  • Think reactive.
  • RxJS is your friend.

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RxJS Declarative Approach

  • leverage the power of rxjs observables and operators.
  • effectively combine streams.

 

  • easy share observables.
  • readily react to user action.

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RxJS Course on PluralSight

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NgRx

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Other tools to manage the state

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SASS

https://slides.com/patriciovargas/sass/fullscreen

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@import '../../../shared/sass/variables';
.search-results-page {
  width: 100%;
  margin-top: 16px;

  ::ng-deep {
    .ui-dataview {
      width: 1000px;
      height: 500px;
      a {
        &.ui-button {
          &.ui-state-active {
            background-color: $primary-green;
          }
        }

        &.ui-paginator-page {
          &.ui-state-active {
            background-color: $primary-green;
          }
        }
      }
      &-content {
        padding: 0;
      }
    }
  }
}

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Angular Ivy

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Component Libraries

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Extensions

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-Angular Snippets
-Angular Console
-Angular Schematics
-Prettier
-Auto Rename Tag
-Highlight Matching Tag
-HTML Snippets
-IntelliSense for CSS class names in HTML
-JavaScript (ES6) code snippets
-RxJs Snippets
-Paste JSON as Code

Angular Security

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  • Keep current with the latest Angular library releases
     

  • Don't modify your copy of Angular
     

  • Avoid Angular APIs marked in the documentation as “Security Risk.”

https://angular.io/guide/security

Angular PWA

Other things to consider

  • NgFor Trackby

  • Subscribe in the view (async)

  • OnPush Change Detection

  • Angula Schematics

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Game Time

Articles

Angular Libraries with Nx for Enterprise Apps
https://tinyurl.com/wt2kmqb

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Angular Development in Enterprise
https://tinyurl.com/w5nv8pz

Angular Architecture
https://tinyurl.com/ycheksoa

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