no ES6

component.js

import React from 'react';

var SomeMixin = {
  doSomething() {

  }
};

const App = React.createClass({
  getInitialState: function() {
    return {count: this.props.initialCount};
  },
  propTypes: {

  },
  getDefaultProps() {
    return {
      name: 'Mary'
    };
  },
  mixins: [SomeMixin],
  handleClick() {
    this.doSomething(); // use mixin
  },
  render() {
    return (
      <div onClick={this.handleClick}></div>
    );
  }
});

function mapStateToProps(state) {
  console.log(state); 
  return {
    todos: state.todos
  };
}

function mapDispatchToProps(dispatch) {
  return {
    actions: bindActionCreators(TodoActions, dispatch)
  };
}

export default connect(
  mapStateToProps,
  mapDispatchToProps
)(App);

ReactDOM.render(
element,
document.getElementById('root')
);