---
id: angular.upgrade.hydration.angular-hydration-v17-risk-gate
name: Angular Hydration v17 Risk Gate
description: >
  Evaluate hydration and SSR behavior after Angular 17 upgrades when the app uses provideClientHydration, SSR, prerender, or DOM reuse-sensitive widgets. Use when hydration mismatches, server render errors, or third-party DOM manipulation may affect runtime behavior.
stack:
  - Angular
  - TypeScript
category: hydration
status: stable
version: 0.5.2
owner: NgAutoPilot
triggers:
  - hydration risk gate
  - SSR hydration
  - provideClientHydration
  - ngSkipHydration
compatibility:
  angular:
    min: "17"
---

# Angular Hydration v17 Risk Gate

## Purpose

Review hydration and SSR behavior after Angular 17.

## When to Use

- The app uses SSR or prerender.
- The app uses hydration APIs.
- The app has DOM-reusing widgets or third-party DOM manipulation.

## When Not to Use

- The app does not use SSR or hydration.
- The app is still in a version upgrade.

## Required Inputs

- SSR files
- hydration config
- `ngSkipHydration` usage
- hydration-sensitive widgets
- server build scripts

## Procedure

1. Identify hydration entry points.
2. Review mismatch-prone widgets.
3. Validate server and browser builds.
4. Document any temporary opt-outs.

## Do

- Validate SSR and prerender paths.
- Review DOM-reusing widgets carefully.
- Keep hydration opt-outs explicit.

## Do Not

- Do not hide mismatches with blanket opt-outs.
- Do not mix hydration fixes with a version hop.

## Review Checklist

- [ ] SSR build passes.
- [ ] Hydration mismatches are reviewed.
- [ ] Opt-outs are explicit.

## Expected Output

1. Hydration risk summary.
2. SSR validation result.
3. Mismatch/opt-out list.

## Exit Criteria

- Hydration risk is explicit.