🅰️ Angular 17 Setup

 

📌 WHAT is Angular 17?

Angular 17 is the latest stable version of Angular released by Google (Nov 2023). It is a TypeScript-based front-end web application framework that provides tools for:

  • Building dynamic single-page applications (SPAs)

  • Optimizing rendering performance

  • Using components, modules, services, routing, forms, and more.

🚀 Key Highlights in Angular 17

FeatureDescription
✅ Standalone ComponentsNo need for NgModule (simplified bootstrapping)
✅ Signals (Experimental)Reactive state management, like React signals
✅ Declarative Control FlowNew syntax: @if, @for, @switch
✅ Improved SSR HydrationFaster first paint with server-rendered pages
✅ Build PerformanceVite and esbuild-powered builds
✅ TypeScript 5+ supportLatest TypeScript features
✅ Lazy-loading improvedBetter support for on-demand route/component loading

📌 WHY Angular 17?

ReasonBenefit
✅ Modular & ModernClean architecture with new Standalone API
✅ Fast & OptimizedFast rendering, smaller bundles
✅ Declarative & ReactiveNew signal-based reactivity (opt-in)
✅ Better DXVite, standalone bootstrap, control flow syntax
✅ Backed by GoogleEnterprise-grade reliability

📦 Dependencies & Requirements for Angular 17

ToolVersion (Minimum)Purpose
Node.jsv16.14.x or later (v18 LTS recommended)JavaScript runtime
npmv8.x or laterPackage manager
Angular CLIv17Project creation, dev server, builds
TypeScriptv5.xLanguage for Angular apps

✅ Install Node.js from https://nodejs.org

📦 HOW to Setup Angular 17 

🔹 1. Install Angular CLI v17

# Uninstall any previous CLI version (optional)
npm uninstall -g @angular/cli

# Install Angular CLI version 17 globally
npm install -g @angular/cli@17

✅ Verify:

ng version

You should see Angular CLI v17.

🔹 2. Create a New Angular 17 Project

ng new my-angular17-app

🟢 CLI Prompts:

  • Add Angular routing? – Yes if you want navigation between pages

  • Style format? – Choose CSS, SCSS, etc.

📁 Output Structure:


my-angular17-app/
├── src/
│   ├── app/
│   ├── main.ts
│   └── index.html
├── angular.json
├── package.json
└── tsconfig.json
├── angular.json
├── package.json
└── tsconfig.json

🔹 3. Navigate & Serve the App

cd my-angular17-app 
ng serve

🔗 Visit: http://localhost:4200

🔍 Angular 17 Bootstrapping Explained 

✅ 4. main.ts: Application Entry Point

// src/main.ts
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app/app.component';

bootstrapApplication(AppComponent)
  .catch(err => console.error(err));


📌 Note:

  • No AppModule is needed anymore.

  • bootstrapApplication() handles everything.

✅ 5. AppComponent: Root Standalone Component

// src/app/app.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,               // ✅ Standalone component declaration
  imports: [],                    // 👈 You can import other standalone components/modules
  template: `
    <h1>Welcome to Angular 17!</h1>
    <p>{{ title }}</p>
  `,
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'my-angular17-app';
}

🟢 You can now import components and directives directly in imports without modules.

✅ 6. index.html: HTML Shell

<!-- src/index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>My Angular 17 App</title>
  <base href="/" />
</head>
<body>
  <app-root></app-root> <!-- Angular will mount AppComponent here -->
</body>
</html>

🔁 Bootstrapping Flow Summary (Angular 17)


main.ts
  ⇩
bootstrapApplication(AppComponent)
  ⇩
AppComponent
  ⇩
index
  ⇩
AppComponent
  ⇩
index.html <app-root> renders

💡 New Angular 17 Features in Context

✅ 1. Standalone Components

No need for:

@NgModule({
  declarations: [],
  imports: [],
  bootstrap: []
})

Instead, use:

@Component({ standalone: true })

✅ 2. New Declarative Syntax (optional)

Use native-like syntax:

@if (loggedIn) {

  <p>Welcome back!</p>

}


Instead of using *ngIf:

<p *ngIf="loggedIn">Welcome back!</p>

✅ 3. Signals (Reactive State Management)




import { signal } from '@angular/core';

const counter = signal(0);

function increment() {
  counter.update(c => c + 1);
}

📦 Production Build


ng build --configuration production


Output goes to dist/ folder — minified, tree-shaken files.

📘 Useful Angular CLI Commands

CommandDescription
ng generate component my-compCreate a new component
ng generate service apiCreate a service
ng serveStart local dev server
ng buildCompile production build
ng testRun unit tests
ng lintRun code linter

✅ Summary: Angular 17 Setup

StepDescription
1.Install Angular CLI 17
2.Create project with ng new
3.Serve app with ng serve
4.Uses bootstrapApplication() instead of NgModule
5.Write standalone components
6.Run production build, add routes, services as needed

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