155 lines
8.6 KiB
Markdown
155 lines
8.6 KiB
Markdown
---
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name: vue-best-practices
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description: MUST be used for Vue.js tasks. Strongly recommends Composition API with `<script setup>` and TypeScript as the standard approach. Covers Vue 3, SSR, Volar, vue-tsc. Load for any Vue, .vue files, Vue Router, Pinia, or Vite with Vue work. ALWAYS use Composition API unless the project explicitly requires Options API.
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license: MIT
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metadata:
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author: github.com/vuejs-ai
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version: "18.0.0"
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---
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# Vue Best Practices Workflow
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Use this skill as an instruction set. Follow the workflow in order unless the user explicitly asks for a different order.
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## Core Principles
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- **Keep state predictable:** one source of truth, derive everything else.
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- **Make data flow explicit:** Props down, Events up for most cases.
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- **Favor small, focused components:** easier to test, reuse, and maintain.
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- **Avoid unnecessary re-renders:** use computed properties and watchers wisely.
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- **Readability counts:** write clear, self-documenting code.
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## 1) Confirm architecture before coding (required)
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- Default stack: Vue 3 + Composition API + `<script setup lang="ts">`.
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- If the project explicitly uses Options API, load `vue-options-api-best-practices` skill if available.
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- If the project explicitly uses JSX, load `vue-jsx-best-practices` skill if available.
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### 1.1 Must-read core references (required)
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- Before implementing any Vue task, make sure to read and apply these core references:
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- `references/reactivity.md`
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- `references/sfc.md`
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- `references/component-data-flow.md`
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- `references/composables.md`
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- Keep these references in active working context for the entire task, not only when a specific issue appears.
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### 1.2 Plan component boundaries before coding (required)
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Create a brief component map before implementation for any non-trivial feature.
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- Define each component's single responsibility in one sentence.
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- Keep entry/root and route-level view components as composition surfaces by default.
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- Move feature UI and feature logic out of entry/root/view components unless the task is intentionally a tiny single-file demo.
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- Define props/emits contracts for each child component in the map.
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- Prefer a feature folder layout (`components/<feature>/...`, `composables/use<Feature>.ts`) when adding more than one component.
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## 2) Apply essential Vue foundations (required)
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These are essential, must-know foundations. Apply all of them in every Vue task using the core references already loaded in section `1.1`.
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### Reactivity
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- Must-read reference from `1.1`: [reactivity](references/reactivity.md)
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- Keep source state minimal (`ref`/`reactive`), derive everything possible with `computed`.
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- Use watchers for side effects if needed.
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- Avoid recomputing expensive logic in templates.
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### SFC structure and template safety
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- Must-read reference from `1.1`: [sfc](references/sfc.md)
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- Keep SFC sections in this order: `<script>` → `<template>` → `<style>`.
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- Keep SFC responsibilities focused; split large components.
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- Keep templates declarative; move branching/derivation to script.
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- Apply Vue template safety rules (`v-html`, list rendering, conditional rendering choices).
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### Keep components focused
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Split a component when it has **more than one clear responsibility** (e.g. data orchestration + UI, or multiple independent UI sections).
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- Prefer **smaller components + composables** over one “mega component”
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- Move **UI sections** into child components (props in, events out).
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- Move **state/side effects** into composables (`useXxx()`).
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Apply objective split triggers. Split the component if **any** condition is true:
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- It owns both orchestration/state and substantial presentational markup for multiple sections.
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- It has 3+ distinct UI sections (for example: form, filters, list, footer/status).
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- A template block is repeated or could become reusable (item rows, cards, list entries).
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Entry/root and route view rule:
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- Keep entry/root and route view components thin: app shell/layout, provider wiring, and feature composition.
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- Do not place full feature implementations in entry/root/view components when those features contain independent parts.
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- For CRUD/list features (todo, table, catalog, inbox), split at least into:
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- feature container component
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- input/form component
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- list (and/or item) component
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- footer/actions or filter/status component
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- Allow a single-file implementation only for very small throwaway demos; if chosen, explicitly justify why splitting is unnecessary.
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### Component data flow
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- Must-read reference from `1.1`: [component-data-flow](references/component-data-flow.md)
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- Use props down, events up as the primary model.
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- Use `v-model` only for true two-way component contracts.
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- Use provide/inject only for deep-tree dependencies or shared context.
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- Keep contracts explicit and typed with `defineProps`, `defineEmits`, and `InjectionKey` as needed.
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### Composables
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- Must-read reference from `1.1`: [composables](references/composables.md)
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- Extract logic into composables when it is reused, stateful, or side-effect heavy.
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- Keep composable APIs small, typed, and predictable.
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- Separate feature logic from presentational components.
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## 3) Consider optional features only when requirements call for them
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### 3.1 Standard optional features
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Do not add these by default. Load the matching reference only when the requirement exists.
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- Slots: parent needs to control child content/layout -> [component-slots](references/component-slots.md)
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- Fallthrough attributes: wrapper/base components must forward attrs/events safely -> [component-fallthrough-attrs](references/component-fallthrough-attrs.md)
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- Built-in component `<KeepAlive>` for stateful view caching -> [component-keep-alive](references/component-keep-alive.md)
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- Built-in component `<Teleport>` for overlays/portals -> [component-teleport](references/component-teleport.md)
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- Built-in component `<Suspense>` for async subtree fallback boundaries -> [component-suspense](references/component-suspense.md)
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- Animation-related features: pick the simplest approach that matches the required motion behavior.
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- Built-in component `<Transition>` for enter/leave effects -> [transition](references/component-transition.md)
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- Built-in component `<TransitionGroup>` for animated list mutations -> [transition-group](references/component-transition-group.md)
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- Class-based animation for non-enter/leave effects -> [animation-class-based-technique](references/animation-class-based-technique.md)
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- State-driven animation for user-input-driven animation -> [animation-state-driven-technique](references/animation-state-driven-technique.md)
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### 3.2 Less-common optional features
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Use these only when there is explicit product or technical need.
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- Directives: behavior is DOM-specific and not a good composable/component fit -> [directives](references/directives.md)
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- Async components: heavy/rarely-used UI should be lazy loaded -> [component-async](references/component-async.md)
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- Render functions only when templates cannot express the requirement -> [render-functions](references/render-functions.md)
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- Plugins when behavior must be installed app-wide -> [plugins](references/plugins.md)
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- State management patterns: app-wide shared state crosses feature boundaries -> [state-management](references/state-management.md)
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## 4) Run performance optimization after behavior is correct
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Performance work is a post-functionality pass. Do not optimize before core behavior is implemented and verified.
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- Large list rendering bottlenecks -> [perf-virtualize-large-lists](references/perf-virtualize-large-lists.md)
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- Static subtrees re-rendering unnecessarily -> [perf-v-once-v-memo-directives](references/perf-v-once-v-memo-directives.md)
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- Over-abstraction in hot list paths -> [perf-avoid-component-abstraction-in-lists](references/perf-avoid-component-abstraction-in-lists.md)
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- Expensive updates triggered too often -> [updated-hook-performance](references/updated-hook-performance.md)
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## 5) Final self-check before finishing
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- Core behavior works and matches requirements.
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- All must-read references were read and applied.
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- Reactivity model is minimal and predictable.
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- SFC structure and template rules are followed.
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- Components are focused and well-factored, splitting when needed.
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- Entry/root and route view components remain composition surfaces unless there is an explicit small-demo exception.
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- Component split decisions are explicit and defensible (responsibility boundaries are clear).
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- Data flow contracts are explicit and typed.
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- Composables are used where reuse/complexity justifies them.
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- Moved state/side effects into composables if applicable
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- Optional features are used only when requirements demand them.
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- Performance changes were applied only after functionality was complete.
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