deleteproperty.js

 static getDerivedStateFromProps(nextProps, prevState) {
        if (nextProps.carListReducer.list.length === 0 && !nextProps.carListReducer.error) {
            return {
              var newState = Object.assign({}, prevState);
                delete newState.showSpinner;
                return newState; 
            };
        }
        else {
            return {
                ...prevState, showSpinner: false,
            }
        }
    }