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3.3 KiB
title, impact, impactDescription, type, tags
| title | impact | impactDescription | type | tags | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Import h Globally in Vue 3 Render Functions | HIGH | Vue 3 requires explicit h import; using Vue 2 patterns causes runtime errors | gotcha |
|
Import h Globally in Vue 3 Render Functions
Impact: HIGH - In Vue 2, the h function (createElement) was passed as an argument to render functions. In Vue 3, h must be explicitly imported from 'vue'. Using Vue 2 patterns causes runtime errors.
Task Checklist
- Import
hfrom 'vue' at the top of files using render functions - Remove the
hparameter from render function signatures - Update all render functions when migrating from Vue 2
Incorrect (Vue 2 pattern - broken in Vue 3):
// WRONG: Vue 2 pattern - h is not passed as argument in Vue 3
export default {
render(h) { // h is undefined in Vue 3!
return h('div', [
h('span', 'Hello')
])
}
}
// WRONG: Using createElement alias from Vue 2
export default {
render(createElement) { // Also undefined
return createElement('div', 'Hello')
}
}
Correct (Vue 3 pattern):
// CORRECT: Import h from vue
import { h } from 'vue'
export default {
render() {
return h('div', [
h('span', 'Hello')
])
}
}
With Composition API
import { h, ref } from 'vue'
export default {
setup() {
const count = ref(0)
// Return a render function from setup
return () => h('div', [
h('button', { onClick: () => count.value++ }, `Count: ${count.value}`)
])
}
}
With script setup (Not Recommended)
<script setup>
import { h, ref } from 'vue'
const count = ref(0)
// Cannot return render function from script setup
// Must use a separate render option or template
</script>
<!-- script setup typically uses templates, not render functions -->
<template>
<div>
<button @click="count++">Count: {{ count }}</button>
</div>
</template>
If you need render functions with <script setup>, use the render option:
<script>
import { h, ref } from 'vue'
export default {
setup() {
const count = ref(0)
return () => h('button', { onClick: () => count.value++ }, count.value)
}
}
</script>
Component Resolution Change
In Vue 3, you must also explicitly resolve components:
Incorrect:
// Vue 2: Could use string names for registered components
render(h) {
return h('my-component', { props: { value: 1 } })
}
Correct:
import { h, resolveComponent } from 'vue'
export default {
render() {
// Must resolve component by name
const MyComponent = resolveComponent('my-component')
return h(MyComponent, { value: 1 })
}
}
// Or import the component directly (preferred)
import { h } from 'vue'
import MyComponent from './MyComponent.vue'
export default {
render() {
return h(MyComponent, { value: 1 })
}
}
Why This Changed
Vue 3's h is globally importable to:
- Enable tree-shaking (unused features can be removed)
- Support better TypeScript inference
- Allow use outside of component context