Node.js v14.17.4 documentation

Class: AbortController#

A utility class used to signal cancelation in selected Promise-based APIs. The API is based on the Web API AbortController.

To use, launch Node.js using the --experimental-abortcontroller flag.

const ac = new AbortController();

ac.signal.addEventListener('abort', () => console.log('Aborted!'),
                           { once: true });

ac.abort();

console.log(ac.signal.aborted);  // Prints True

abortController.abort()#

Triggers the abort signal, causing the abortController.signal to emit the 'abort' event.

abortController.signal#

• Type: <AbortSignal>

Class: AbortSignal#

• Extends: <EventTarget>

The AbortSignal is used to notify observers when the abortController.abort() method is called.

Static method: AbortSignal.abort()#

• Returns: <AbortSignal>

Returns a new already aborted AbortSignal.

Event: 'abort'#

The 'abort' event is emitted when the abortController.abort() method is called. The callback is invoked with a single object argument with a single type property set to 'abort':

const ac = new AbortController();

// Use either the onabort property...
ac.signal.onabort = () => console.log('aborted!');

// Or the EventTarget API...
ac.signal.addEventListener('abort', (event) => {
  console.log(event.type);  // Prints 'abort'
}, { once: true });

ac.abort();

The AbortController with which the AbortSignal is associated will only ever trigger the 'abort' event once. We recommended that code check that the abortSignal.aborted attribute is false before adding an 'abort' event listener.

Any event listeners attached to the AbortSignal should use the { once: true } option (or, if using the EventEmitter APIs to attach a listener, use the once() method) to ensure that the event listener is removed as soon as the 'abort' event is handled. Failure to do so may result in memory leaks.

abortSignal.aborted#

• Type: <boolean> True after the AbortController has been aborted.

abortSignal.onabort#

• Type: <Function>

An optional callback function that may be set by user code to be notified when the abortController.abort() function has been called.

Class: Buffer#

• <Function>

Used to handle binary data. See the buffer section.

__dirname#

This variable may appear to be global but is not. See __dirname.

__filename#

This variable may appear to be global but is not. See __filename.

clearImmediate(immediateObject)#

clearImmediate is described in the timers section.

clearInterval(intervalObject)#

clearInterval is described in the timers section.

clearTimeout(timeoutObject)#

clearTimeout is described in the timers section.

console#