Zone

Definitions

1. An execution context that persists across asynchronous operations, allowing frameworks to intercept and track async activity (timers, promises, event listeners). Made prominent by Zone.js in Angular, where it automatically triggers change detection when async tasks complete.

   In plain English: An invisible wrapper around your code that notices whenever an async operation finishes, so the framework knows when to update the screen.

   Example: "Angular's zone detects when the HTTP call resolves and kicks off change detection — that's why the view updates without you calling setState."

Related Terms

• Isomorphic
• Lexical Scope
• Prototype Chain
• Proxy Object
• Route Guard
• RxJS
• Stale Closure
• Top-Level Await
• Universal Module Definition