redux connect impementation

redux-connect.js

function connect(mapStateToProps, mapDispatchToProps) {
  return function(WrappedComponent) {
    return class extends React.Component {
      constructor() {
        const { store } = this.context;
        this.unsubcribe = store.subcribe(this.handleChange)
      }

      componentWillUnmount() {
        this.unsubcribe()
      }

      handleChange = () => {
        this.forceUpdate()
      }

      render() {
        return(
          <WrappedComponent 
          {...this.props}
          {...mapStateToProps(store.getState, this.props)}
          {...mapDispatchToProps(store.dispatch, this.props)}
          /> 
        )
      }
    }
  }
}