A flux implementation without the boilerplate
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alt-ng is a Flux implementation that removes all the boilerplate traditionally associated to managing data. alt-ng is based on JavaScript classes, does not use switch statements and supports Promises out-of-the-box. Check out the tutorial, or jump straight into the documentation.

Features of alt-ng

  • Promises are first class citizens
  • Lightweight: A lot of code has been removed from the original alt implementation to make it even more lightweight
  • No constants or switch statements: Removes all the boilerplate of traditional Flux frameworks
  • Unidirectional flow of information: Enforces the basic principles in flux
  • Follows the Flux Standard Action standard.
  • Designed to work in both the client and server side
  • Actively maintained and being used in production.
  • Based on ES6 classes

Code example

With alt-ng, action results are automatically dispatched to methods in the stores:


import Alt from 'alt-ng';

// create our singleton instance
export default new Alt();


import alt from './alt';

// Mock remote API
// The real thing would connect to the server using Fetch API or a polyfill
const MyUserApi = {
  fetch: function(userId) {
    console.log(`Retrieving user ${userId}`);
    return Promise.resolve({
      id: userId,
      name: `User ${userId}`
  save: function(user) {
    console.log(`Saving user ${user.id}`);
    return Promise.resolve(user);

export default alt.createActions('UserActions', {

  // Promises are transparently resolved before dispatching to the Store
  fetchUser: function(userId) => {
    return MyUserApi.fetch(userId);

  // more Promises
  saveUser: function(user) => {
    return MyUserApi.save(user);

  // other values are dispatched directly to the Store
  onChange: function(attributeName, value) {
    let value = {};
    value[attributeName] = value;
    return value;


The action methods will be used as constants while binding.


import alt from './alt';
import UserActions from './UserActions';
import Store from 'alt-ng/Store';

// This Store will contain the User that is being edited right now as its 'state' attribute.
// The Store methods will be notified when the actions are dispatced
class UserStore extends Store {

  constructor() {
    this.state = {
      user: undefined

  fetchUser(user) {
    this.setState({ user });

  saveUser(user) {
    this.setState({ user });

  onChange(userField) {
      user: Object.assign(this.getState().user, userField))

const userStore = alt.createStore('UserStore', new UserStore());
export { userACtions, userStore };

The easiest way to use this Store is to inject state as properties to the view:

import UserStore from './UserStore';
import UserACtions from './UserActions';
import AltContainer from 'alt-ng/AltContainer';
import React from 'react';

class UserData extends React.Component {

  constructor() {
    this.onChange = this.onChange.bind(this);
    this.onSubmit = this.onSubmit.bind(this);

  onChange(e) {
    UserActions.onChange(e.name, e.value);

  onSubmit(e) {
    // after a successful page save, send the browser somewhere else
    UserActions.save(this.props.user).then(() => {
      location.href = '/users';

  render() {
    const user = this.props.user;
    return (
      <form onSubmit={this.onSubmit}>
          <input name="name" value={user.name} onChange={this.onChange}/>
        <button type="submit" />


class MyApp extends React.Component {

  render() {
    // inject userStore.state as UserData.props
    return (
      <AltContainer store={userStore}>
        <UserData />


You can get the full story by reading the tutorial or the documentation.


Licensed under the MIT license

alt-ng is based on the great job by Josh Perez, the original author of Alt