frontend/components/CartCount.js


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import styled from 'styled-components';
import { TransitionGroup, CSSTransition } from 'react-transition-group';

const Dot = styled.div`
  background: ${props => props.theme.red};
  color: white;
  border-radius: 50%;
  padding: 5px;
  margin-left: 1rem;
  font-weight: 100;
  font-feature-settings: 'tnum';
  font-variant-numeric: tabular-nums;
`;

const AnimationStyles = styled.span`
  position: relative;
  .count {
    display: block;
    position: relative;
    transition: all 0.4s;
    backface-visibility: hidden;
  }
  .count-enter {
    transform: rotateX(0.5turn);
  }

  .count-enter-active {
    transform: rotateX(0);
  }

  .count-exit {
    top: 0;
    position: absolute;
    transform: rotateX(0);
  }

  .count-exit-active {
    transform: rotateX(0.5turn);
  }
`;

const CartCount = ({ count }) => (
  <AnimationStyles>
    <TransitionGroup>
      <CSSTransition className="count" classNames="count" key={count} timeout={{ enter: 2000, exit: 2000 }}>
        <Dot>{count}</Dot>
      </CSSTransition>
    </TransitionGroup>
  </AnimationStyles>
);

export default CartCount;