text: import { createElement, Component } from 'react';
  import shallowEqual from 'shallowequal'
  import hoistStatics from 'hoist-non-react-statics';
  import { storeShape } from './PropTypes';
  
  function getDisplayName(WrappedComponent) {
    return WrappedComponent.displayName || WrappedComponent.name || 'Component';
  }
  
  const defaultMapStateToProps = () => ({});
  
  export default function connect(mapStateToProps) {
    const shouldSubscribe = !!mapStateToProps;
    const finnalMapStateToProps = mapStateToProps || defaultMapStateToProps;
  
    return function wrapWithConnect(WrappedComponent) {
      class Connect extends Component {
        static displayName = `Connect(${getDisplayName(WrappedComponent)})`;
  
        static contextTypes = {
          miniStore: storeShape.isRequired,
        };
  
        constructor(props, context) {
          super(props, context);
  
          this.store = context.miniStore;
          this.state = { subscribed: finnalMapStateToProps(this.store.getState(), props) };
        }
  
        componentDidMount() {
          this.trySubscribe();
        }
  
        componentWillUnmount() {
          this.tryUnsubscribe();
        }
  
        handleChange = () => {
          if (!this.unsubscribe) {
            return;
          }
  
          const nextState = finnalMapStateToProps(this.store.getState(), this.props);
          if (!shallowEqual(this.nextState, nextState)) {
            this.nextState = nextState;
            this.setState({ subscribed: nextState });
          }
        };
  
        trySubscribe() {
          if (shouldSubscribe) {
            this.unsubscribe = this.store.subscribe(this.handleChange);
            this.handleChange();
          }
        }
  
        tryUnsubscribe() {
          if (this.unsubscribe) {
            this.unsubscribe();
            this.unsubscribe = null;
          }
        }
  
        render() {
          return createElement(WrappedComponent, {
            ...this.props,
            ...this.state.subscribed,
            store: this.store,
          });
        }
      }
  
      return hoistStatics(Connect, WrappedComponent);
    };
  }
  