Explain the Vue component lifecycle hooks in the Composition API

In the Composition API, lifecycle hooks are imported functions called inside setup() or <script setup>, roughly corresponding to Options API hooks:

• onBeforeMount / onMounted
• onBeforeUpdate / onUpdated
• onBeforeUnmount / onUnmounted
• onErrorCaptured
• onActivated / onDeactivated (for <KeepAlive>)

import { onMounted, onUnmounted } from 'vue'

onMounted(() => {
  console.log('component mounted')
})
onUnmounted(() => {
  console.log('cleanup here')
})

Note there's no beforeCreate/created equivalent — that logic just goes directly in setup(), since setup() itself runs at that point in the lifecycle.