pipe

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  value: 'test',
  
  printValue: Ember.observer('value', function() {
    console.log(this.get('value'))
  }),
  
  actions: {
    setValue: function(value) {
      return this.set('value', value);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  onInput: function(value) {
    alert(value);
    return value;
  }
});

helpers.pipe.js

import Ember from 'ember';

const { Helper: { helper } } = Ember;

export function pipe(actions = []) {
  return function(...args) {
    return actions.reduce((acc, curr, idx) => {
      if (idx === 0) {
        return curr(...args);
      }
      return curr(acc);
    }, undefined);
  };
}

export default helper(pipe);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component onInput=onInput}}
<br>
<br>

templates.components.my-component.hbs

<input value={{readonly value}} oninput={{action (pipe (action "setValue") onInput) value="target.value"}}/>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1",
    "ember-composable-helpers": "0.24.1"
  }
}