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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.

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  • evals/evals.json4.8 KB
  • references/hydration.md814 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

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 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

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