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zone.js

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zone.js

Zones for JavaScript

  • 0.8.29
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
1.4M
decreased by-59.56%
Maintainers
2
Weekly downloads
 
Created

What is zone.js?

The zone.js package is a library that implements Zones for JavaScript. Zones are execution contexts that allow you to intercept and keep track of asynchronous operations in JavaScript. This is particularly useful for debugging, performance tracking, and managing multiple tasks in complex applications such as Angular.

What are zone.js's main functionalities?

Error Handling

Intercepts errors within a specific zone and allows custom error handling.

Zone.current.fork({
  name: 'errorHandlingZone',
  onHandleError: (parentZoneDelegate, currentZone, targetZone, error) => {
    console.error('Error intercepted in zone:', error);
    return false;
  }
}).run(() => {
  throw new Error('Test Error');
});

Execution Context Tracking

Tracks the scheduling and execution of asynchronous tasks, providing insights into the application's asynchronous flow.

Zone.current.fork({
  name: 'trackingZone',
  onScheduleTask: (delegate, currentZone, targetZone, task) => {
    console.log('Task scheduled:', task.source);
    return delegate.scheduleTask(targetZone, task);
  }
}).run(() => {
  setTimeout(() => {
    console.log('Timeout callback executed.');
  }, 1000);
});

Performance Monitoring

Measures the time taken to execute asynchronous tasks, which can be used for performance analysis.

Zone.current.fork({
  name: 'performanceMonitoringZone',
  onInvokeTask: (delegate, currentZone, targetZone, task, applyThis, applyArgs) => {
    const start = performance.now();
    delegate.invokeTask(targetZone, task, applyThis, applyArgs);
    const duration = performance.now() - start;
    console.log('Task took:', duration, 'ms');
  }
}).run(() => {
  setTimeout(() => {
    console.log('Timeout callback executed.');
  }, 1000);
});

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Package last updated on 22 Jan 2019

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