Knowledge Base | Daily Notes

zone.js

Aug 30, 20241 min read

name Github repo link
type link
action https://github.com/angular/angular/tree/main/packages/zone.js

A Zone is an execution context that persists across async tasks. You can think of it as thread-local storage for JavaScript VMs.

zone.js patched most standard web APIs (such as DOM events, XMLHttpRequest, …) and nodejs APIs (EventEmitter, fs, …), for more details

What is zone delegate and invoke method in it? What are proxy zone spec?

  • Angular monkey patches the events like setTimeout, setInterval to make it come out of the cycle changeDetectionStrategy can be modified and change detection can be triggered manually.

Questions

  • Q. What is the simplest example of zone.js working?
  • Q. What do persist across async tasks mean? So for a for loop with var declared outside the loop, if the loop contains a setTimeout, then the last value of the loop will be printed and not the value at various increment stages.
  • Q. What isthread_local_storage?

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