feat: Complete fleet — 94 skills across 10+ domains
Pulled ALL skills from 15 source repositories: - anthropics/skills: 16 (docs, design, MCP, testing) - obra/superpowers: 14 (TDD, debugging, agents, planning) - coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth) - better-auth/skills: 5 (auth patterns) - vercel-labs/agent-skills: 5 (React, design, Vercel) - antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo) - Plus 13 individual skills from various repos Mosaic Stack is not limited to coding — the Orchestrator and subagents serve coding, business, design, marketing, writing, logistics, analysis, and more. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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---
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title: Import h Globally in Vue 3 Render Functions
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impact: HIGH
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impactDescription: Vue 3 requires explicit h import; using Vue 2 patterns causes runtime errors
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type: gotcha
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tags: [vue3, render-function, migration, h, vnode, breaking-change]
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---
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# Import h Globally in Vue 3 Render Functions
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**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.
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## Task Checklist
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- [ ] Import `h` from 'vue' at the top of files using render functions
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- [ ] Remove the `h` parameter from render function signatures
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- [ ] Update all render functions when migrating from Vue 2
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**Incorrect (Vue 2 pattern - broken in Vue 3):**
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```js
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// WRONG: Vue 2 pattern - h is not passed as argument in Vue 3
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export default {
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render(h) { // h is undefined in Vue 3!
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return h('div', [
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h('span', 'Hello')
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])
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}
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}
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// WRONG: Using createElement alias from Vue 2
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export default {
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render(createElement) { // Also undefined
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return createElement('div', 'Hello')
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}
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}
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```
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**Correct (Vue 3 pattern):**
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```js
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// CORRECT: Import h from vue
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import { h } from 'vue'
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export default {
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render() {
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return h('div', [
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h('span', 'Hello')
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])
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}
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}
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```
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## With Composition API
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```js
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import { h, ref } from 'vue'
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export default {
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setup() {
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const count = ref(0)
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// Return a render function from setup
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return () => h('div', [
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h('button', { onClick: () => count.value++ }, `Count: ${count.value}`)
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])
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}
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}
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```
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## With script setup (Not Recommended)
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```vue
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<script setup>
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import { h, ref } from 'vue'
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const count = ref(0)
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// Cannot return render function from script setup
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// Must use a separate render option or template
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</script>
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<!-- script setup typically uses templates, not render functions -->
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<template>
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<div>
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<button @click="count++">Count: {{ count }}</button>
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</div>
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</template>
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```
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If you need render functions with `<script setup>`, use the `render` option:
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```vue
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<script>
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import { h, ref } from 'vue'
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export default {
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setup() {
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const count = ref(0)
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return () => h('button', { onClick: () => count.value++ }, count.value)
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}
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}
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</script>
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```
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## Component Resolution Change
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In Vue 3, you must also explicitly resolve components:
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**Incorrect:**
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```js
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// Vue 2: Could use string names for registered components
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render(h) {
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return h('my-component', { props: { value: 1 } })
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}
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```
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**Correct:**
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```js
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import { h, resolveComponent } from 'vue'
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export default {
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render() {
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// Must resolve component by name
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const MyComponent = resolveComponent('my-component')
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return h(MyComponent, { value: 1 })
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}
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}
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// Or import the component directly (preferred)
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import { h } from 'vue'
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import MyComponent from './MyComponent.vue'
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export default {
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render() {
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return h(MyComponent, { value: 1 })
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}
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}
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```
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## Why This Changed
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Vue 3's `h` is globally importable to:
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1. Enable tree-shaking (unused features can be removed)
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2. Support better TypeScript inference
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3. Allow use outside of component context
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## Reference
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- [Vue 3 Migration Guide - Render Function API](https://v3-migration.vuejs.org/breaking-changes/render-function-api.html)
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- [Vue.js Render Functions & JSX](https://vuejs.org/guide/extras/render-function.html)
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