Update environment to use Angular v19

[marburek]

Upgrade Angular Integration to v19

Note

Angular will drop support for v18 on November 21, 2025 (Angular Release Schedule).

In line with our upgrade policy, we should upgrade our Angular integration to v19 and drop support for earlier versions.
During this upgrade, we must also verify compatibility with Angular v20 to ensure future readiness.

Compatibility summary

A compatibility check was performed using CKEditor 5 v47.2.0 and CKEditor5 Builder v2.7.7 with a basic free editor setup (core + text formatting, excluding “remove formatting”).

Test procedure: (see)

1. Verified npm and CDN builds on Angular v18.2.21 (baseline).
2. Upgraded npm project via:

   npx ng update @angular/core@19 @angular/cli@19

   Confirmed Angular version v19.2.19.
3. Served the app — editor loaded successfully, no console errors.
4. Repeated the same using CDN build.
5. Upgraded both npm and CDN projects to Angular v20.3.9.
6. Served again — editor functioned correctly, no console errors.

Result: Both Angular 19 and Angular 20 are compatible with the current CKEditor 5 setup.

Definition of Done

• Angular used in the ckeditor5-angular repository is upgraded to v19.
• Support for Angular v18 and lower is dropped.
• Compatibility with Angular v20 is confirmed and documented.
• README and other documentation reflect the new version support.
  • https://ckeditor.com/docs/ckeditor5/latest/getting-started/installation/cloud/angular.html#supported-angular-versions
  • https://ckeditor.com/docs/ckeditor5/latest/getting-started/installation/self-hosted/angular.html#supported-angular-versions

Other details

Original issue

Angular is dropping support for v18 on 2025-11-21.

After that, we would like to have our integration upgraded to v19 and drop support for lower versions, in accordance with our upgrade policy.

Definition of done

• Angular integration has been upgraded to v19
• Any legacy code related to older versions has been removed
• Readme and other documentation have been updated
• Any relevant CI has been updated

[pomek]

First of all, please check whether CKEditor 5 and Angular 19 (and 20) are compatible.

[marburek]

Since I sometimes completely misunderstand Angular, I will describe my procedure for a sanity check to see if my test was valid.

Note: I performed all using Editor v47.2.0 and production CKEditor5-Builder v2.7.7 with a basic free editor setup (core + text formatting without "remove formatting" feature)

1. Just to be sure, first checked both npm and CDN builds on default Angular v18.2.21
2. Used "npx ng update @angular/core@19 @angular/cli@19" in my npm project.
3. Checked and the angular version was indeed 19.2.19.
4. Served the app and checked if everything looks fine and there are no errors in the console.
5. Then did the same with CDN project (update to v19 -> serve)
6. Updated CDN project to Angular 20.3.9, served, looked at editor & console
7. Updated npm project to Angular 20.3.9, served, looked at editor & console

Hopefully that was the test I was supposed to perform and if yes -> both Angular 19 and 20 are compatible

[Witoso]

Looks good!