Namespaced Higher Order Components
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Since mixins are dead, higher order components are the way to go.

But when you use multiple higher order component for a Component it can be confusing, you have to think about where the behavior comes from.

An Extension is namespaced and also explicit about what are the methods/variables that are be provided to the Component.

To create an Extension:

Here we are defining a UserConnection extension, it allows to get the user information it allows you to call in your component, this.props['UserConnection'].variables.firstName and this.props['UserConnection'].variables.lastName. If you want to refresh the user simply call this.props['UserConnection'].refresh(). You can pass accountUrl and updateAccountUrl as params of the Extension.

import * as Extension from 'react-component-extension';

const UserConnection = {
  // This is the public name of the Extension
  extensionName: 'UserConnection',
  exports: {
    // Variables accessibles from the Extension
    variables: ['firstName', 'lastName'],
    // Methods callable on the Extension
    methods: ['refresh'],
  // Required params to use the extension
  // should be an object key: 'description'
  requiredParams: {
    accountUrl: 'url to fetch the user',
  optionalParams: {
    updateAccountUrl: 'url to update the user',

export default Extension.create(UserConnection);

To use the Extension:

class Account extends React.Component {
  render() {
      hello {this.props['UserConnection'].variables.firstName}
      click <button onClick={this.props['UserConnection'].refresh}>here</button> to refresh

export default UserConnection(AccountPage, {
  accountUrl: 'api/account'

Other Examples

const AddSpinningLoader = {
  extensionName: 'AddSpinningLoader',

  exports: {
    methods: ['start', 'stop']

  getInitialState() {
    return {
      loading: false,

  start() {
    this.setState({loading: true})

  stop() {
    this.setState({loading: false})

  renderExtension() {
    let spinningLoader = this.state.loading ? <SpinningLoader/> : null;

    return (

export default Extension.create(AddSpinningLoader);
class Form extends React.Component {
  constructor(props) {

    this.onSubmitButton = this.onSubmitButton.bind(this);

    this.state = {
      firstName: ''

  onSubmitButton() {

  doAccountUpdate() {

    $.post('api/account_update', {
      firstName: this.state.firstName

  render() {
      <input type="text" value={this.state.firstName} onChange={(firstName) => this.setState({firstName})} />;
      <button onClick={this.onSubmitButton} />

Form = ValidationErrorBar(Form, {
  isValid: function () {
    return this.firstName !== '';

export default Form;


npm install --save react-component-extension

Updating from a React Mixin to an Extension

It is pretty straightforward to make a React Mixin an Extension, for example here is react-timer-mixin as an Extension


  • Add tests
  • Really do the example code
  • Add examples