How to handle animations in Vue.js?

Vue.js provides a built-in transition system. You can use the v-enter, v-leave-to, and other classes to define CSS transitions or animations.

<transition name="fade" mode="out-in">
  <div :key="componentKey">Content</div>
</transition>

.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}