What is Angular Zone (NgZone) and why is it important?

Quick Answer NgZone is Angular's wrapper around Zone.js. It runs callbacks inside the Angular zone, which triggers change detection when they complete. run() executes code inside the zone (triggers CD). runOutsideAngular() executes outside the zone (no CD trigger) - use for performance-intensive non-UI work. Important for integrating third-party libraries that do async work not tracked by Angular.

Answer

NgZone allows Angular to track asynchronous operations such as HTTP requests, timeouts, promises, and events. When these operations complete, Angular triggers change detection to update the UI automatically.

Developers can execute heavy tasks outside Angular’s zone using runOutsideAngular() to avoid unnecessary change detection and improve performance.

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What is Angular Zone (NgZone) and why is it important?

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