Unstated  —  The setState of React State Management

Unstated is designed to build on top of the patterns already set out by React components and (the new) Context.

Unstated is built upon three pieces that all work together:

  1. Container
  2. <Subscribe>
  3. <Provider>

The idea is that the Container only keeps itself busy with the state. Using <Subscribe> you can link that state to your Component. The <Provider> wraps itself around everything, keeping things together.

import React from 'react';
import { render } from 'react-dom';
import { Provider, Subscribe, Container } from 'unstated';

type CounterState = {
  count: number

class CounterContainer extends Container<CounterState> {
  state = {
    count: 0

  increment() {
    this.setState({ count: this.state.count + 1 });

  decrement() {
    this.setState({ count: this.state.count - 1 });

function Counter() {
  return (
    <Subscribe to={[CounterContainer]}>
      {counter => (
          <button onClick={() => counter.decrement()}>-</button>
          <button onClick={() => counter.increment()}>+</button>

    <Counter />

Unstated — The setState of React State Management →
Unstated →

HTML5 context menus in Firefox

You may not know it, but the HTML5 specifications go beyond what we put in the pages and also define how parts of the browser should become available to developers with HTML, CSS and JavaScript. One of these parts of the specs are context menus, or “right click menus”. Using HTML5 and a menu element you can add new options to these without having to write a browser add-on. In Firefox 8 (the current one) we have support for those

HTML5 context menus in Firefox (Screencast and Code) →