abort-group

abort-group

Group a set of cancelable actions to be aborted together at any time.

Install

npm install --save abort-group

Usage

import abortGroup from "abort-group";

const group = abortGroup();

// Supports all `(set|request)Name` functions off of the window such as:
group.setTimeout(handleAnimationFrame, 1000);
group.setInterval(handleAnimationFrame, 1000);
group.requestAnimationFrame(handleAnimationFrame);

// Supports both nodejs and dom event emitters.
group.on(document.body, "click", handleClick);
group.once(document.body, "DOMContentLoaded", handleLoad);

// Can add cancel functions.
group.add(() => console.log("aborted"));

// Can add objects with a abort, cancel, or unsubscribe functions.
group.add({ abort: () => console.log("aborted") });
group.add({ cancel: () => console.log("aborted") });
group.add({ unsubscribe: () => console.log("aborted") });

// This means you can add other groups which get aborted when the parent does.
const subgroup = abortGroup();
group.add(subgroup);

// You can also add observables.
group.add(Rx.Observable.range(1, 5).subscribe(handleSubscription));

finally

group.abort(); // Stop all async tasks above.

API

#set{NAME}(...args): function

Calls the native set function such as setTimeout, passing all arguments, and clears it if the group is aborted. Returns a function to cancel the task early.

the methods are dynamically added based on what is available

group.setTimeout(() => ..., 500);
group.setInterval(() => ..., 500);
group.setImmediate(() => ...);

const stop = group.setTimeout(() => ..., 100);
stop(); // manually remove the timeout.

#request{NAME}(...args): function

Calls the native request function such as requestAnimationFrame, passing all arguments, and cancels it if the group is aborted.

the methods are dynamically added based on what is available

group.requestAnimationFrame(() => ...);
group.requestIdleCallback(() => ...);

const stop = group.requestAnimationFrame(() => ...);
stop(); // manually remove the animation frame.

#on(emitter: EventEmitter|EventTarget, type: string, handler: function): function

Adds an event handler to the provided nodejs EventEmitter or browser EventTarget and removes the handler if the group is aborted. Returns a function to cancel the handler early.

const stop = group.on(window, "resize", handleResize);
stop(); // manually stop the event handler.

#once(emitter: EventEmitter|EventTarget, type: string, handler: function): function

Adds an event handler to the provided nodejs EventEmitter or browser EventTarget and removes the handler if the group is aborted or after the first call.

const stop = group.once(window, "resize", handleResize); // Only handle one resize.
stop(); // manually stop the event handler.

#add(cancelable): function

Adds a cancelable object (one with an abort, cancel or unsubscribe method) to be canceled when the group aborts. You can also pass a function to be called when the group aborts.

group.add(handleAbort);
group.add({ abort: handleAbort });
group.add({ cancel: handleAbort });
group.add({ unsubscribe: handleAbort });

const stop = group.add(handleAbort);
stop(); // manually call the handleAbort function.

#fork(): AbortGroup

Creates a new group which is automatically aborted then the parent group is aborted.

const subGroup = group.fork();
subGroup.setTimeout(() => ..., 100);
group.abort(); // Cancels sub group also.

#abort()

Aborts any tasks added to the group using the above methods.

group.abort();