javascript source code of CartNav

import React, { useState } from 'react';
import Cart from './Cart';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { library } from '@fortawesome/fontawesome-svg-core';
import { faShoppingBag, faTimes } from '@fortawesome/free-solid-svg-icons';

library.add(faShoppingBag, faTimes);

const CartNav = ({ cart, onRemoveFromCart }) => {
    const [isCartVisible, setCartVisible] = useState(false);

    const renderOpenButton = () => (
        <button className="nav__cart-btn--open">
            <FontAwesomeIcon size="2x" icon="shopping-bag" color="#292B83"/>
            {cart !== null ? <span>{cart.total_items}</span> : ''}
        </button>
    )

    const renderCloseButton = () => (
        <button className="nav__cart-btn--close">
            <FontAwesomeIcon size="1x" icon="times" color="white"/>
        </button>
    )

    return (
        <div className="nav">
            <div className="nav__cart" onClick={() => setCartVisible(!isCartVisible)}>
                { !isCartVisible ? renderOpenButton() : renderCloseButton() }
            </div>
            { isCartVisible &&
                <Cart
                    cart={cart}
                    onRemoveFromCart={onRemoveFromCart}
                />
            }  
        </div>
    );
};

export default CartNav;