PureComponent for preact

purecomponent.js

import { Component } from 'preact';

export default class PureComponent extends Component {
  shouldComponentUpdate(props, state) {
    return !(shallowEqual(props, this.props) && shallowEqual(state, this.state));
  }
}

function shallowEqual(a, b) {
	for (let key in a) if (a[key]!==b[key]) return false;
	for (let key in b) if (!(key in a)) return false;
	return true;
}

@developit why don't you make this part of preact so we can just do import {PureComponent} from 'preact'