Connect higher-order component from internal closure.

makeConnector.js

export function makeConnector (store) {
  return function connect(mapStateToProps, mapDispatchToProps, mergeProps, options = {}) {
    // same stuff
    return function wrapWithConnect(WrappedComponent) {
      return class Connect extends Component {
        // same stuff
        constructor(props) {
          super(props)
          this.store = props.store || store
          // same stuff
        }
        // same stuff
      }
    }
  }
}