I recently learned about a new project by the Angular team called Zone. This project is one of those rare gems that is only a few lines of code but is so groundbreaking it literally takes time to wrap your mind around it. The easiest way to get started with Zone is to watch the excellent talk by its creator, Brian Ford. He demos some pretty cool scenarios that are all in the project repository.
In a nutshell, Zone provides what you might consider a “thread execution” context for JavaScript. It basically takes the current “context” you are in and intercepts all asynchronous events so they “map” to the same context. This enables you to do some pretty interesting things such as view stack traces through the original wire-up (i.e. you no longer get “disconnected” at the point the event was raised) or add tooling. You can use Zone to change the behavior of events (such as implementing your own version of setTimeout) and to keep track of tasks.
Zone works by simply running something in the context of the Zone. You can have multiple Zones with their own context.
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