angular-ssr
Implement Angular SSR with hydration, TransferState caching, and per-route render modes. Use when configuring Angular Universal SSR, client hydration, static prerendering, or preventing double-fetching.
What this skill does
# SSR (Server-Side Rendering)
## **Priority: P2 (MEDIUM)**
## 1. Enable Hydration
- Run `ng add @angular/ssr`.
- Add `provideClientHydration(withEventReplay())` to `app.config.ts` providers.
See [hydration examples](references/hydration.md) for app config and hydration setup.
## 2. Guard Browser-Only Code
- Use `afterNextRender(() => { /* window access */ })` for one-time browser-only code.
- For recurring checks, inject `PLATFORM_ID` and use `isPlatformBrowser(platformId)`.
## 3. Prevent Double-Fetching
- Use `withHttpTransferCacheOptions()` or manual `TransferState` to cache server responses for client replay.
## 4. Configure Render Modes (Angular 17+)
Export `ServerRoute[]` in `app.routes.server.ts`:
- **RenderMode.Prerender** — Static HTML at build time (blogs, marketing).
- **RenderMode.Server** — Dynamic SSR per request (user-specific pages).
- **RenderMode.Client** — Client-only SPA (authenticated dashboards).
## 5. Incremental Hydration (Angular 19+)
- Defer hydration with `@defer (hydrate on viewport)`.
- Triggers: `viewport`, `interaction`, `idle`, `timer(ms)`, `immediate`, `never`.
- Add `withEventReplay()` to capture user events before hydration completes.
## Anti-Patterns
- **No direct window/document access**: Use `afterNextRender()` or `PLATFORM_ID` check.
- **No double-fetching**: Use `withHttpTransferCacheOptions()` or `TransferState`.
- **No SSR for auth-gated pages**: Set `RenderMode.Client` for authenticated dashboards.
## References
- [Hydration](references/hydration.md)Related in Image & Video
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