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CI Build Ember Observer Score npm version Monthly Downloads from NPM Code Style: prettier

Ember applications have long life-cycles. A user may navigate to several pages and use many different features before they leave the application. This makes JavaScript and Ember development unlike Rails development, where the lifecycle of a request is short and the environment disposed of after each request. It makes Ember development much more like iOS or video game development than traditional server-side web development.

This addon introduces several functional utility methods to help manage async, object lifecycles, and the Ember runloop. These tools should provide a simple developer experience that allows engineers to focus on the business domain, and think less about the weird parts of working in a long-lived app.

The documentation website contains more examples and API information.


  • Ember.js v3.16 or above
  • Ember CLI v3.16 or above
  • Node.js v12 or above


ember install ember-lifeline


Ember Lifeline supports a functional API that enables entanglement - the association of async behavior to object instances. This allows you to write async code in your classes that can be automatically cleaned up for you when the object is destroyed.

Ember's runloop functions, like the example below, don't ensure that an object's async is cleaned up.

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { run } from '@ember/runloop';

export default class Example extends Component {
  @tracked date;
  constructor() {

    run.later(() => { = new Date();
    }, 500);

Using ember-lifeline's equivalent, in this case runTask, can help ensure that any active async is cleaned up once the object is destroyed.

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { runTask } from 'ember-lifeline';

export default class Example extends Component {
  @tracked date;
  constructor() {

      () => { = new Date();

For more information and examples, please visit the documentation website.


See the Contributing guide for details.


This addon was developed internally at Twitch, written originally by @mixonic and @rwjblue. It's since been further developed and maintained by scalvert.

The name ember-lifeline was suggested by @nathanhammod.