vue

Based on Vue 3.5. Always use Composition API with <script setup lang="ts">.

Preferences

• Prefer TypeScript over JavaScript
• Prefer <script setup lang="ts"> over <script>
• For performance, prefer shallowRef over ref if deep reactivity is not needed
• Always use Composition API over Options API
• Discourage using Reactive Props Destructure

Core

Features

Quick Reference

Component Template

<script setup lang="ts">
import { ref, computed, watch, onMounted } from 'vue'

const props = defineProps<{
  title: string
  count?: number
}>()

const emit = defineEmits<{
  update: [value: string]
}>()

const model = defineModel<string>()

const doubled = computed(() => (props.count ?? 0) * 2)

watch(() => props.title, (newVal) => {
  console.log('Title changed:', newVal)
})

onMounted(() => {
  console.log('Component mounted')
})
</script>

<template>
  <div>{{ title }} - {{ doubled }}</div>
</template>

Key Imports

// Reactivity
import { ref, shallowRef, computed, reactive, readonly, toRef, toRefs, toValue } from 'vue'

// Watchers
import { watch, watchEffect, watchPostEffect, onWatcherCleanup } from 'vue'

// Lifecycle
import { onMounted, onUpdated, onUnmounted, onBeforeMount, onBeforeUpdate, onBeforeUnmount } from 'vue'

// Utilities
import { nextTick, defineComponent, defineAsyncComponent } from 'vue'

Folded Skill References

These former standalone skills are bundled here as references to keep the runtime list compact. Load only the reference that matches the user's exact product, framework, or failure mode.