feat(angular): update to Angular 22 with zoneless change detection and flat ESLint config

[ShaneK]

resolves: internal

What is the current behavior?

The app targets Angular 20 and boots with Zone.js, relying on Zone-based updating

What is the new behavior?

Upgrades the Angular toolchain from 20 to 22 (and TypeScript 5.8 to 6.0, @ionic/angular-toolkit to ^12.3.0) and runs the app zoneless, which is the Angular 21+ default. Zone.js is removed from package.json, src/zone-flags.ts is deleted, and the zone.js import is dropped from src/polyfills.ts.

To work without Zone, component state that changes outside template/synchronous-lifecycle context is converted to signals and read as loggedIn(), tracks(), session(), etc. in the templates.

ESLint is migrated from .eslintrc.json to a flat eslint.config.js built on angular-eslint + typescript-eslint. Specs add provideZonelessChangeDetection() so tests run under the same change-detection model as the app.

Does this introduce a breaking change?

• Yes
• No

Other information

@ionic/angular is pinned to an unreleased dev snapshot instead of ^8.0.0. That needs to go back to a stable release before this merges

Note that as part of this, we had to update the node version to 24, and as part of that we had to change the branch protections to be the node 24 test so they could pass for this PR. This, however, means every branch PR without these changes will not be able to pass until this is merged and those are updated.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
ionic-conference-app	Ready	Preview, Comment	Jun 29, 2026 1:52pm