Upgrading from Angular 18 to Angular 19 ensures your project benefits from improved performance, new framework capabilities, and long-term stability. This guide explains the complete upgrade process, compatibility checks, required commands, breaking changes, and testing procedures.
1. Why Upgrade to Angular 19?
Angular 19 brings several improvements and refinements, including:
- Better build performance and faster dev server times
- Improved Signals API stability
- Updated TypeScript compatibility
- More efficient hydration and server-side rendering
- Fixes and optimizations across core packages
Before upgrading, ensure your project is already on the latest Angular 18 patch release.
2. Pre-Upgrade Checklist
Before running upgrade commands, follow this checklist:
✔ Backup Your Project
Commit all work to Git or take a zip backup.
✔ Update Node.js
Angular 19 typically requires an updated Node version.
Use:
node -v
If needed, update Node from https://nodejs.org/.
✔ Update Angular CLI Globally
npm install -g @angular/cli@latest
✔ Remove Old Cache
npm cache clean --force
3. Step-By-Step Upgrade Process
Step 1: Update Angular CLI & Core Packages
Run the official Angular update command:
ng update @angular/core@19 @angular/cli@19
If your project uses Angular Material:
ng update @angular/material@19
This automatically updates dependencies, TypeScript, and RxJS where required.
4. Common Additional Updates
Update Signals or Standalone APIs
If you use Signals or Zone-Less mode, Angular 19 includes behavior refinements.
Fix deprecated usages:
// Example: replacing deprecated signal patterns
const count = signal(0); // Updated stable API
Update TypeScript
Angular 19 may require a newer TypeScript version:
npm install typescript@latest --save-dev
Update RxJS (If prompted)
If Angular CLI suggests an RxJS update:
ng update rxjs
5. Check for Breaking Changes
Angular 19 may introduce changes such as:
- Deprecated APIs removed
- Updated SSR/Hydration lifecycle
- Stricter type checks
- Adjustments in routing signals
- Changes in Angular Material components
Review framework logs after running the update. Angular usually auto-migrates most breaking changes.
6. Test Your Application Thoroughly
Run Your App:
ng serve
Run Unit Tests:
ng test
Run Production Build:
ng build --configuration production
Watch for warnings or breaking API errors.
7. Optimize & Fix Post-Upgrade Issues
▶ Rebuild node_modules
If you face dependency issues:
rm -rf node_modules
npm install
▶ Clear Angular Cache
ng cache clean
▶ Re-run migration tools
ng update
8. Final Verification
After everything works:
- Commit your updated project
- Update documentation
- Validate production build on hosting environment
Your Angular 18 → 19 upgrade is now complete.
Citations
Internal: https://savanka.com/category/savanka-helps/
External: http://angular.dev/
