State of change detection in Angular and how far are we from Zoneless applications ?

on YouTube ↗41m

" summary

Explains that Angular now uses Signals-based local change detection to build a signal graph so the framework only re-renders nodes that actually changed, eliminating many ancestor traversals, preventing ExpressionChangedAfterItHasBeenChecked errors and allowing bidirectional updates without manual microtask hacks. Shows a live demo that highlights far fewer change detections. Describes a zoneless scheduler using rAF+setTimeout prototype that replaces Zone.js (removing ~30 KB and noisy stack frames), and notes ongoing work on stability/hydration APIs and v17 hooks; the prototype works but full zoneless apps remain in progress.

AI-written summary · about

" chapters (11)

1. 0:00Angular change detection intro
2. 5:03Zone.js and scheduling
3. 10:28OnPush optimization
4. 13:51Bidirectional data flow fixes
5. 17:23Signals for state
6. 21:41OnPush vs Signals challenges
7. 25:20Signal-based improvements
8. 30:44Moving beyond Zone.js with zoneless apps
9. 35:49Zoneless challenges
10. 39:49Future of change detection
11. 40:12Q&A

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