angular-ssr

What this skill does

# Angular SSR

Implement server-side rendering, hydration, and prerendering in Angular v20+.

## Setup

### Add SSR to Existing Project

```bash
ng add @angular/ssr
```

This adds:
- `@angular/ssr` package
- `server.ts` - Express server
- `src/main.server.ts` - Server bootstrap
- `src/app/app.config.server.ts` - Server providers
- Updates `angular.json` with SSR configuration

### Project Structure

```
src/
├── app/
│   ├── app.config.ts          # Browser config
│   ├── app.config.server.ts   # Server config
│   └── app.routes.ts
├── main.ts                     # Browser bootstrap
├── main.server.ts              # Server bootstrap
server.ts                       # Express server
```

## Configuration

### app.config.server.ts

```typescript
import { ApplicationConfig, mergeApplicationConfig } from '@angular/core';
import { provideServerRendering } from '@angular/platform-server';
import { provideServerRoutesConfig } from '@angular/ssr';
import { appConfig } from './app.config';
import { serverRoutes } from './app.routes.server';

const serverConfig: ApplicationConfig = {
  providers: [
    provideServerRendering(),
    provideServerRoutesConfig(serverRoutes),
  ],
};

export const config = mergeApplicationConfig(appConfig, serverConfig);
```

### Server Routes Configuration

```typescript
// app.routes.server.ts
import { RenderMode, ServerRoute } from '@angular/ssr';

export const serverRoutes: ServerRoute[] = [
  {
    path: '',
    renderMode: RenderMode.Prerender, // Static at build time
  },
  {
    path: 'products',
    renderMode: RenderMode.Prerender,
  },
  {
    path: 'products/:id',
    renderMode: RenderMode.Server, // Dynamic SSR
  },
  {
    path: 'dashboard',
    renderMode: RenderMode.Client, // Client-only (SPA)
  },
  {
    path: '**',
    renderMode: RenderMode.Server,
  },
];
```

### Render Modes

| Mode | Description | Use Case |
|------|-------------|----------|
| `RenderMode.Prerender` | Static HTML at build time | Marketing pages, blogs |
| `RenderMode.Server` | Dynamic SSR per request | User-specific content |
| `RenderMode.Client` | Client-side only (SPA) | Authenticated dashboards |

## Hydration

### Default Hydration

Hydration is enabled by default with `provideClientHydration()`:

```typescript
// app.config.ts
import { provideClientHydration } from '@angular/platform-browser';

export const appConfig: ApplicationConfig = {
  providers: [
    provideClientHydration(),
    // ...
  ],
};
```

### Incremental Hydration

Defer hydration of specific components:

```typescript
@Component({
  template: `
    <!-- Hydrate when visible -->
    @defer (hydrate on viewport) {
      <app-comments [postId]="postId" />
    } @placeholder {
      <div class="comments-placeholder">Loading comments...</div>
    }
    
    <!-- Hydrate on interaction -->
    @defer (hydrate on interaction) {
      <app-interactive-chart [data]="chartData" />
    }
    
    <!-- Hydrate on idle -->
    @defer (hydrate on idle) {
      <app-recommendations />
    }
    
    <!-- Never hydrate (static only) -->
    @defer (hydrate never) {
      <app-static-footer />
    }
  `,
})
export class Post {
  postId = input.required<string>();
  chartData = input.required<ChartData>();
}
```

### Hydration Triggers

| Trigger | Description |
|---------|-------------|
| `hydrate on viewport` | When element enters viewport |
| `hydrate on interaction` | On click, focus, or input |
| `hydrate on idle` | When browser is idle |
| `hydrate on immediate` | Immediately after load |
| `hydrate on timer(ms)` | After specified delay |
| `hydrate when condition` | When expression is true |
| `hydrate never` | Never hydrate (static) |

### Event Replay

Capture user events before hydration completes:

```typescript
import { provideClientHydration, withEventReplay } from '@angular/platform-browser';

export const appConfig: ApplicationConfig = {
  providers: [
    provideClientHydration(withEventReplay()),
  ],
};
```

## Browser-Only Code

### Platform Detection

```typescript
import { PLATFORM_ID, inject } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';

@Component({...})
export class My {
  private platformId = inject(PLATFORM_ID);
  
  ngOnInit() {
    if (isPlatformBrowser(this.platformId)) {
      // Browser-only code
      window.addEventListener('scroll', this.onScroll);
    }
  }
}
```

### afterNextRender / afterRender

Run code only in browser after rendering:

```typescript
import { afterNextRender, afterRender } from '@angular/core';

@Component({...})
export class Chart {
  constructor() {
    // Runs once after first render (browser only)
    afterNextRender(() => {
      this.initChart();
    });
    
    // Runs after every render (browser only)
    afterRender(() => {
      this.updateChart();
    });
  }
  
  private initChart() {
    // Safe to use DOM APIs here
    const canvas = document.getElementById('chart');
    new Chart(canvas, this.config);
  }
}
```

### Inject Browser APIs Safely

```typescript
// tokens.ts
import { InjectionToken, PLATFORM_ID, inject } from '@angular/core';
import { isPlatformBrowser } from '@angular/common';

export const WINDOW = new InjectionToken<Window | null>('Window', {
  providedIn: 'root',
  factory: () => {
    const platformId = inject(PLATFORM_ID);
    return isPlatformBrowser(platformId) ? window : null;
  },
});

export const LOCAL_STORAGE = new InjectionToken<Storage | null>('LocalStorage', {
  providedIn: 'root',
  factory: () => {
    const platformId = inject(PLATFORM_ID);
    return isPlatformBrowser(platformId) ? localStorage : null;
  },
});

// Usage
@Injectable({ providedIn: 'root' })
export class Storage {
  private storage = inject(LOCAL_STORAGE);
  
  get(key: string): string | null {
    return this.storage?.getItem(key) ?? null;
  }
  
  set(key: string, value: string): void {
    this.storage?.setItem(key, value);
  }
}
```

## Prerendering

### Static Routes

```typescript
// app.routes.server.ts
export const serverRoutes: ServerRoute[] = [
  { path: '', renderMode: RenderMode.Prerender },
  { path: 'about', renderMode: RenderMode.Prerender },
  { path: 'contact', renderMode: RenderMode.Prerender },
  { path: 'blog', renderMode: RenderMode.Prerender },
];
```

### Dynamic Routes with getPrerenderParams

```typescript
// app.routes.server.ts
import { RenderMode, ServerRoute, PrerenderFallback } from '@angular/ssr';

export const serverRoutes: ServerRoute[] = [
  {
    path: 'products/:id',
    renderMode: RenderMode.Prerender,
    async getPrerenderParams() {
      // Fetch product IDs to prerender
      const response = await fetch('https://api.example.com/products');
      const products = await response.json();
      return products.map((p: Product) => ({ id: p.id }));
    },
    fallback: PrerenderFallback.Server, // SSR for non-prerendered
  },
  {
    path: 'blog/:slug',
    renderMode: RenderMode.Prerender,
    async getPrerenderParams() {
      const posts = await fetchBlogPosts();
      return posts.map(post => ({ slug: post.slug }));
    },
    fallback: PrerenderFallback.Client, // SPA for non-prerendered
  },
];
```

### Prerender Fallback Options

| Fallback | Description |
|----------|-------------|
| `PrerenderFallback.Server` | SSR for non-prerendered routes |
| `PrerenderFallback.Client` | Client-side rendering |
| `PrerenderFallback.None` | 404 for non-prerendered routes |

## HTTP Caching

### TransferState

Automatically transfer HTTP responses from server to client:

```typescript
import { provideClientHydration, withHttpTransferCacheOptions } from '@angular/platform-browser';

export const appConfig: ApplicationConfig = {
  providers: [
    provideClientHydration(
      withHttpTransferCacheOptions({
        includePostRequests: true,
        includeRequestsWithAuthHeaders: false,
        filter: (req) => !req.url.includes('/api/realtime'),
      })
    ),
  ],
};
```

### Manual TransferState

```typescript
import { TransferStat