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function joinClasses(){
  var args = [].slice.call(arguments, 0)
  
  return args.reduce(function(current, next){
    if(!current) return next
    if( next)    return (current ? current + " " : "") + next
  })
}

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export interface Subscription {
  readonly closed: boolean;
  unsubscribe: () => void;
}

export interface Observer<T> {
  closed: boolean;
  error: (error: any) => void;
  complete: () => void;
  next: (value: T) => void;

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The 0.13.0 improvements to React Components are often framed as "es6 classes" but being able to use the new class syntax isn't really the big change. The main thing of note in 0.13 is that React Components are no longer special objects that need to be created using a specific method (createClass()). One of the benefits of this change is that you can use the es6 class syntax, but also tons of other patterns work as well!

Below are a few examples creating React components that all work as expected using a bunch of JS object creation patterns (https://github.com/getify/You-Dont-Know-JS/blob/master/this%20&%20object%20prototypes/ch4.md#mixins). All of the examples are of stateful components, and so need to delegate to React.Component for setState(), but if you have stateless components each patterns tends to get even simpler. The one major caveat with react components is that you need to assign props and context to the component instance otherwise the component will be static. The reason is

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const { utils } = require('react-docgen');
const { default: resolveHOC } = require('react-docgen/dist/utils/resolveHOC');
const {
  default: resolveToModule,
} = require('react-docgen/dist/utils/resolveToModule');

module.exports = ({ moduleName = 'styled-components' } = {}) => {
  const isStyledExpression = (tagPath, t) =>
    (t.CallExpression.check(tagPath.node) &&
      tagPath.get('callee').node.name === 'styled') ||

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/* eslint-disable no-param-reassign */
const { promises: fs, readFileSync } = require('fs');
const path = require('path');
const prettier = require('prettier');
const { parse, stringify } = require('comment-json');

const getWorkspaces = require('get-workspaces').default;
const findWorkspacesRoot = require('find-workspaces-root').default;

const safeRequire = m => {

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function useEventCallback(fn) {
  const ref = useRef(fn)

  useLayoutEffect(() => {
    ref.current = fn;
  }, [fn]);

  return useCallback(() => {
    const fn = ref.current;
    return fn();

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import React, { useReducer, useContext, useMemo } from 'react'
import get from 'lodash/get'
import invariant from 'invariant'

const INIT = {
  type: `INIT${Math.random()
    .toString(36)
    .substring(7)
    .split('')
    .join('.')}`,

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const concord = require('enhanced-resolve/lib/concord');
const getInnerRequest = require('enhanced-resolve/lib/getInnerRequest');
const createInnerCallback = require('enhanced-resolve/lib//createInnerCallback');

const defaultConfig = {
  './lib/**': './src/**',
};

function normalizeCondition(condition) {
  let normalized = [].concat(condition);

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import React, { PropTypes } from 'react';
import { findDOMNode } from 'react-dom'
import getOffset from 'dom-helpers/query/offset';

let ScrollSpy = React.createClass({
  childContextTypes: {
    $scrollSpy: PropTypes.shape({
      anchor: PropTypes.func,
      activeTarget: PropTypes.string
    })

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import React from 'react';
import { Router as BaseRouter } from 'react-router';
import { getParamNames, formatPattern } from 'react-router/lib/PatternUtils';
import { createRoutes } from 'react-router/lib/RouteUtils'
import createBrowserHistory from 'history/lib/createBrowserHistory';
import useBeforeUnload from 'history/lib/useBeforeUnload';
import invariant from 'app/utils/invariant';
import { each, pick, omit, sortBy } from 'lodash';

const EMPTY_AREA = '@@none';