From 38d7a024b774b6c4a3a53e5ebe9466073ef445e6 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 12 Feb 2026 19:11:26 +0000
Subject: [PATCH 1/2] Initial plan
From f89bf15487f197d2f4a9f31dc8acf3a532099d21 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 12 Feb 2026 19:14:18 +0000
Subject: [PATCH 2/2] Add GitHub Copilot Skills to repository
Co-authored-by: Kushmanmb <193178375+Kushmanmb@users.noreply.github.com>
---
.../vercel-composition-patterns/AGENTS.md | 946 ++++++
.../vercel-composition-patterns/SKILL.md | 89 +
.../rules/architecture-avoid-boolean-props.md | 100 +
.../rules/architecture-compound-components.md | 112 +
.../patterns-children-over-render-props.md | 87 +
.../rules/patterns-explicit-variants.md | 100 +
.../rules/react19-no-forwardref.md | 42 +
.../rules/state-context-interface.md | 191 ++
.../rules/state-decouple-implementation.md | 113 +
.../rules/state-lift-state.md | 125 +
.../vercel-react-best-practices/AGENTS.md | 2934 +++++++++++++++++
.../vercel-react-best-practices/SKILL.md | 136 +
.../rules/advanced-event-handler-refs.md | 55 +
.../rules/advanced-init-once.md | 42 +
.../rules/advanced-use-latest.md | 39 +
.../rules/async-api-routes.md | 38 +
.../rules/async-defer-await.md | 80 +
.../rules/async-dependencies.md | 51 +
.../rules/async-parallel.md | 28 +
.../rules/async-suspense-boundaries.md | 99 +
.../rules/bundle-barrel-imports.md | 59 +
.../rules/bundle-conditional.md | 31 +
.../rules/bundle-defer-third-party.md | 49 +
.../rules/bundle-dynamic-imports.md | 35 +
.../rules/bundle-preload.md | 50 +
.../rules/client-event-listeners.md | 74 +
.../rules/client-localstorage-schema.md | 71 +
.../rules/client-passive-event-listeners.md | 48 +
.../rules/client-swr-dedup.md | 56 +
.../rules/js-batch-dom-css.md | 107 +
.../rules/js-cache-function-results.md | 80 +
.../rules/js-cache-property-access.md | 28 +
.../rules/js-cache-storage.md | 70 +
.../rules/js-combine-iterations.md | 32 +
.../rules/js-early-exit.md | 50 +
.../rules/js-hoist-regexp.md | 45 +
.../rules/js-index-maps.md | 37 +
.../rules/js-length-check-first.md | 49 +
.../rules/js-min-max-loop.md | 82 +
.../rules/js-set-map-lookups.md | 24 +
.../rules/js-tosorted-immutable.md | 57 +
.../rules/rendering-activity.md | 26 +
.../rules/rendering-animate-svg-wrapper.md | 47 +
.../rules/rendering-conditional-render.md | 40 +
.../rules/rendering-content-visibility.md | 38 +
.../rules/rendering-hoist-jsx.md | 46 +
.../rules/rendering-hydration-no-flicker.md | 82 +
.../rendering-hydration-suppress-warning.md | 30 +
.../rules/rendering-svg-precision.md | 28 +
.../rules/rendering-usetransition-loading.md | 75 +
.../rules/rerender-defer-reads.md | 39 +
.../rules/rerender-dependencies.md | 45 +
.../rules/rerender-derived-state-no-effect.md | 40 +
.../rules/rerender-derived-state.md | 29 +
.../rules/rerender-functional-setstate.md | 74 +
.../rules/rerender-lazy-state-init.md | 58 +
.../rules/rerender-memo-with-default-value.md | 38 +
.../rules/rerender-memo.md | 44 +
.../rules/rerender-move-effect-to-event.md | 45 +
.../rerender-simple-expression-in-memo.md | 35 +
.../rules/rerender-transitions.md | 40 +
.../rerender-use-ref-transient-values.md | 73 +
.../rules/server-after-nonblocking.md | 73 +
.../rules/server-auth-actions.md | 96 +
.../rules/server-cache-lru.md | 41 +
.../rules/server-cache-react.md | 76 +
.../rules/server-dedup-props.md | 65 +
.../rules/server-parallel-fetching.md | 83 +
.../rules/server-serialization.md | 38 +
.../vercel-react-native-skills/AGENTS.md | 2897 ++++++++++++++++
.../vercel-react-native-skills/SKILL.md | 121 +
.../rules/animation-derived-value.md | 53 +
.../rules/animation-gesture-detector-press.md | 95 +
.../rules/animation-gpu-properties.md | 65 +
.../design-system-compound-components.md | 66 +
.../rules/fonts-config-plugin.md | 71 +
.../rules/imports-design-system-folder.md | 68 +
.../rules/js-hoist-intl.md | 61 +
.../rules/list-performance-callbacks.md | 44 +
.../list-performance-function-references.md | 132 +
.../rules/list-performance-images.md | 53 +
.../rules/list-performance-inline-objects.md | 97 +
.../rules/list-performance-item-expensive.md | 94 +
.../rules/list-performance-item-memo.md | 82 +
.../rules/list-performance-item-types.md | 104 +
.../rules/list-performance-virtualize.md | 67 +
.../rules/monorepo-native-deps-in-app.md | 46 +
.../monorepo-single-dependency-versions.md | 63 +
.../rules/navigation-native-navigators.md | 188 ++
.../react-compiler-destructure-functions.md | 50 +
...react-compiler-reanimated-shared-values.md | 48 +
.../rules/react-state-dispatcher.md | 91 +
.../rules/react-state-fallback.md | 56 +
.../rules/react-state-minimize.md | 65 +
.../rules/rendering-no-falsy-and.md | 74 +
.../rules/rendering-text-in-text-component.md | 36 +
.../rules/scroll-position-no-state.md | 82 +
.../rules/state-ground-truth.md | 80 +
.../rules/ui-expo-image.md | 66 +
.../rules/ui-image-gallery.md | 104 +
.../rules/ui-measure-views.md | 78 +
.../rules/ui-menus.md | 174 +
.../rules/ui-native-modals.md | 77 +
.../rules/ui-pressable.md | 61 +
.../rules/ui-safe-area-scroll.md | 65 +
.../rules/ui-scrollview-content-inset.md | 45 +
.../rules/ui-styling.md | 87 +
.agents/skills/web-design-guidelines/SKILL.md | 39 +
108 files changed, 13830 insertions(+)
create mode 100644 .agents/skills/vercel-composition-patterns/AGENTS.md
create mode 100644 .agents/skills/vercel-composition-patterns/SKILL.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/architecture-avoid-boolean-props.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/architecture-compound-components.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/patterns-children-over-render-props.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/patterns-explicit-variants.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/react19-no-forwardref.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/state-context-interface.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/state-decouple-implementation.md
create mode 100644 .agents/skills/vercel-composition-patterns/rules/state-lift-state.md
create mode 100644 .agents/skills/vercel-react-best-practices/AGENTS.md
create mode 100644 .agents/skills/vercel-react-best-practices/SKILL.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/advanced-event-handler-refs.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/advanced-init-once.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/advanced-use-latest.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/async-api-routes.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/async-defer-await.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/async-dependencies.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/async-parallel.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/async-suspense-boundaries.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/bundle-barrel-imports.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/bundle-conditional.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/bundle-defer-third-party.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/bundle-dynamic-imports.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/bundle-preload.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/client-event-listeners.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/client-localstorage-schema.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/client-passive-event-listeners.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/client-swr-dedup.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-batch-dom-css.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-cache-function-results.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-cache-property-access.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-cache-storage.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-combine-iterations.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-early-exit.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-hoist-regexp.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-index-maps.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-length-check-first.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-min-max-loop.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-set-map-lookups.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/js-tosorted-immutable.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-activity.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-animate-svg-wrapper.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-conditional-render.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-content-visibility.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-hoist-jsx.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-hydration-no-flicker.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-hydration-suppress-warning.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-svg-precision.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rendering-usetransition-loading.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-defer-reads.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-dependencies.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-derived-state-no-effect.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-derived-state.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-functional-setstate.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-lazy-state-init.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-memo-with-default-value.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-memo.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-move-effect-to-event.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-simple-expression-in-memo.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-transitions.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/rerender-use-ref-transient-values.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-after-nonblocking.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-auth-actions.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-cache-lru.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-cache-react.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-dedup-props.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-parallel-fetching.md
create mode 100644 .agents/skills/vercel-react-best-practices/rules/server-serialization.md
create mode 100644 .agents/skills/vercel-react-native-skills/AGENTS.md
create mode 100644 .agents/skills/vercel-react-native-skills/SKILL.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/animation-derived-value.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/animation-gesture-detector-press.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/animation-gpu-properties.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/design-system-compound-components.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/fonts-config-plugin.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/imports-design-system-folder.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/js-hoist-intl.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-callbacks.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-function-references.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-images.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-item-memo.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-item-types.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/list-performance-virtualize.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/monorepo-single-dependency-versions.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/navigation-native-navigators.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/react-compiler-destructure-functions.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/react-state-dispatcher.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/react-state-fallback.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/rendering-text-in-text-component.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/scroll-position-no-state.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/state-ground-truth.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-expo-image.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-menus.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-native-modals.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-pressable.md
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create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-scrollview-content-inset.md
create mode 100644 .agents/skills/vercel-react-native-skills/rules/ui-styling.md
create mode 100644 .agents/skills/web-design-guidelines/SKILL.md
diff --git a/.agents/skills/vercel-composition-patterns/AGENTS.md b/.agents/skills/vercel-composition-patterns/AGENTS.md
new file mode 100644
index 000000000000..558bf9aa1e36
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/AGENTS.md
@@ -0,0 +1,946 @@
+# React Composition Patterns
+
+**Version 1.0.0**
+Engineering
+January 2026
+
+> **Note:**
+> This document is mainly for agents and LLMs to follow when maintaining,
+> generating, or refactoring React codebases using composition. Humans
+> may also find it useful, but guidance here is optimized for automation
+> and consistency by AI-assisted workflows.
+
+---
+
+## Abstract
+
+Composition patterns for building flexible, maintainable React components. Avoid boolean prop proliferation by using compound components, lifting state, and composing internals. These patterns make codebases easier for both humans and AI agents to work with as they scale.
+
+---
+
+## Table of Contents
+
+1. [Component Architecture](#1-component-architecture) — **HIGH**
+ - 1.1 [Avoid Boolean Prop Proliferation](#11-avoid-boolean-prop-proliferation)
+ - 1.2 [Use Compound Components](#12-use-compound-components)
+2. [State Management](#2-state-management) — **MEDIUM**
+ - 2.1 [Decouple State Management from UI](#21-decouple-state-management-from-ui)
+ - 2.2 [Define Generic Context Interfaces for Dependency Injection](#22-define-generic-context-interfaces-for-dependency-injection)
+ - 2.3 [Lift State into Provider Components](#23-lift-state-into-provider-components)
+3. [Implementation Patterns](#3-implementation-patterns) — **MEDIUM**
+ - 3.1 [Create Explicit Component Variants](#31-create-explicit-component-variants)
+ - 3.2 [Prefer Composing Children Over Render Props](#32-prefer-composing-children-over-render-props)
+4. [React 19 APIs](#4-react-19-apis) — **MEDIUM**
+ - 4.1 [React 19 API Changes](#41-react-19-api-changes)
+
+---
+
+## 1. Component Architecture
+
+**Impact: HIGH**
+
+Fundamental patterns for structuring components to avoid prop
+proliferation and enable flexible composition.
+
+### 1.1 Avoid Boolean Prop Proliferation
+
+**Impact: CRITICAL (prevents unmaintainable component variants)**
+
+Don't add boolean props like `isThread`, `isEditing`, `isDMThread` to customize
+
+component behavior. Each boolean doubles possible states and creates
+
+unmaintainable conditional logic. Use composition instead.
+
+**Incorrect: boolean props create exponential complexity**
+
+```tsx
+function Composer({
+ onSubmit,
+ isThread,
+ channelId,
+ isDMThread,
+ dmId,
+ isEditing,
+ isForwarding,
+}: Props) {
+ return (
+
+ )
+}
+```
+
+**Correct: composition eliminates conditionals**
+
+```tsx
+// Channel composer
+function ChannelComposer() {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+// Thread composer - adds "also send to channel" field
+function ThreadComposer({ channelId }: { channelId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+// Edit composer - different footer actions
+function EditComposer() {
+ return (
+
+
+
+
+
+
+
+
+
+ )
+}
+```
+
+Each variant is explicit about what it renders. We can share internals without
+
+sharing a single monolithic parent.
+
+### 1.2 Use Compound Components
+
+**Impact: HIGH (enables flexible composition without prop drilling)**
+
+Structure complex components as compound components with a shared context. Each
+
+subcomponent accesses shared state via context, not props. Consumers compose the
+
+pieces they need.
+
+**Incorrect: monolithic component with render props**
+
+```tsx
+function Composer({
+ renderHeader,
+ renderFooter,
+ renderActions,
+ showAttachments,
+ showFormatting,
+ showEmojis,
+}: Props) {
+ return (
+
+ )
+}
+```
+
+**Correct: compound components with shared context**
+
+```tsx
+const ComposerContext = createContext(null)
+
+function ComposerProvider({ children, state, actions, meta }: ProviderProps) {
+ return (
+
+ {children}
+
+ )
+}
+
+function ComposerFrame({ children }: { children: React.ReactNode }) {
+ return
+}
+
+function ComposerInput() {
+ const {
+ state,
+ actions: { update },
+ meta: { inputRef },
+ } = use(ComposerContext)
+ return (
+ update((s) => ({ ...s, input: text }))}
+ />
+ )
+}
+
+function ComposerSubmit() {
+ const {
+ actions: { submit },
+ } = use(ComposerContext)
+ return
+}
+
+// Export as compound component
+const Composer = {
+ Provider: ComposerProvider,
+ Frame: ComposerFrame,
+ Input: ComposerInput,
+ Submit: ComposerSubmit,
+ Header: ComposerHeader,
+ Footer: ComposerFooter,
+ Attachments: ComposerAttachments,
+ Formatting: ComposerFormatting,
+ Emojis: ComposerEmojis,
+}
+```
+
+**Usage:**
+
+```tsx
+
+
+
+
+
+
+
+
+
+
+```
+
+Consumers explicitly compose exactly what they need. No hidden conditionals. And the state, actions and meta are dependency-injected by a parent provider, allowing multiple usages of the same component structure.
+
+---
+
+## 2. State Management
+
+**Impact: MEDIUM**
+
+Patterns for lifting state and managing shared context across
+composed components.
+
+### 2.1 Decouple State Management from UI
+
+**Impact: MEDIUM (enables swapping state implementations without changing UI)**
+
+The provider component should be the only place that knows how state is managed.
+
+UI components consume the context interface—they don't know if state comes from
+
+useState, Zustand, or a server sync.
+
+**Incorrect: UI coupled to state implementation**
+
+```tsx
+function ChannelComposer({ channelId }: { channelId: string }) {
+ // UI component knows about global state implementation
+ const state = useGlobalChannelState(channelId)
+ const { submit, updateInput } = useChannelSync(channelId)
+
+ return (
+
+ sync.updateInput(text)}
+ />
+ sync.submit()} />
+
+ )
+}
+```
+
+**Correct: state management isolated in provider**
+
+```tsx
+// Provider handles all state management details
+function ChannelProvider({
+ channelId,
+ children,
+}: {
+ channelId: string
+ children: React.ReactNode
+}) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+
+// UI component only knows about the context interface
+function ChannelComposer() {
+ return (
+
+
+
+
+
+
+
+ )
+}
+
+// Usage
+function Channel({ channelId }: { channelId: string }) {
+ return (
+
+
+
+ )
+}
+```
+
+**Different providers, same UI:**
+
+```tsx
+// Local state for ephemeral forms
+function ForwardMessageProvider({ children }) {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+
+ return (
+
+ {children}
+
+ )
+}
+
+// Global synced state for channels
+function ChannelProvider({ channelId, children }) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+The same `Composer.Input` component works with both providers because it only
+
+depends on the context interface, not the implementation.
+
+### 2.2 Define Generic Context Interfaces for Dependency Injection
+
+**Impact: HIGH (enables dependency-injectable state across use-cases)**
+
+Define a **generic interface** for your component context with three parts:
+
+`state`, `actions`, and `meta`. This interface is a contract that any provider
+
+can implement—enabling the same UI components to work with completely different
+
+state implementations.
+
+**Core principle:** Lift state, compose internals, make state
+
+dependency-injectable.
+
+**Incorrect: UI coupled to specific state implementation**
+
+```tsx
+function ComposerInput() {
+ // Tightly coupled to a specific hook
+ const { input, setInput } = useChannelComposerState()
+ return
+}
+```
+
+**Correct: generic interface enables dependency injection**
+
+```tsx
+// Define a GENERIC interface that any provider can implement
+interface ComposerState {
+ input: string
+ attachments: Attachment[]
+ isSubmitting: boolean
+}
+
+interface ComposerActions {
+ update: (updater: (state: ComposerState) => ComposerState) => void
+ submit: () => void
+}
+
+interface ComposerMeta {
+ inputRef: React.RefObject
+}
+
+interface ComposerContextValue {
+ state: ComposerState
+ actions: ComposerActions
+ meta: ComposerMeta
+}
+
+const ComposerContext = createContext(null)
+```
+
+**UI components consume the interface, not the implementation:**
+
+```tsx
+function ComposerInput() {
+ const {
+ state,
+ actions: { update },
+ meta,
+ } = use(ComposerContext)
+
+ // This component works with ANY provider that implements the interface
+ return (
+ update((s) => ({ ...s, input: text }))}
+ />
+ )
+}
+```
+
+**Different providers implement the same interface:**
+
+```tsx
+// Provider A: Local state for ephemeral forms
+function ForwardMessageProvider({ children }: { children: React.ReactNode }) {
+ const [state, setState] = useState(initialState)
+ const inputRef = useRef(null)
+ const submit = useForwardMessage()
+
+ return (
+
+ {children}
+
+ )
+}
+
+// Provider B: Global synced state for channels
+function ChannelProvider({ channelId, children }: Props) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**The same composed UI works with both:**
+
+```tsx
+// Works with ForwardMessageProvider (local state)
+
+
+
+
+
+
+
+// Works with ChannelProvider (global synced state)
+
+
+
+
+
+
+```
+
+**Custom UI outside the component can access state and actions:**
+
+```tsx
+function ForwardMessageDialog() {
+ return (
+
+
+
+ )
+}
+
+// This button lives OUTSIDE Composer.Frame but can still submit based on its context!
+function ForwardButton() {
+ const {
+ actions: { submit },
+ } = use(ComposerContext)
+ return
+}
+
+// This preview lives OUTSIDE Composer.Frame but can read composer's state!
+function MessagePreview() {
+ const { state } = use(ComposerContext)
+ return
+}
+```
+
+The provider boundary is what matters—not the visual nesting. Components that
+
+need shared state don't have to be inside the `Composer.Frame`. They just need
+
+to be within the provider.
+
+The `ForwardButton` and `MessagePreview` are not visually inside the composer
+
+box, but they can still access its state and actions. This is the power of
+
+lifting state into providers.
+
+The UI is reusable bits you compose together. The state is dependency-injected
+
+by the provider. Swap the provider, keep the UI.
+
+### 2.3 Lift State into Provider Components
+
+**Impact: HIGH (enables state sharing outside component boundaries)**
+
+Move state management into dedicated provider components. This allows sibling
+
+components outside the main UI to access and modify state without prop drilling
+
+or awkward refs.
+
+**Incorrect: state trapped inside component**
+
+```tsx
+function ForwardMessageComposer() {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+
+ return (
+
+
+
+
+ )
+}
+
+// Problem: How does this button access composer state?
+function ForwardMessageDialog() {
+ return (
+
+ )
+}
+```
+
+**Incorrect: useEffect to sync state up**
+
+```tsx
+function ForwardMessageDialog() {
+ const [input, setInput] = useState('')
+ return (
+
+ )
+}
+
+function ForwardMessageComposer({ onInputChange }) {
+ const [state, setState] = useState(initialState)
+ useEffect(() => {
+ onInputChange(state.input) // Sync on every change 😬
+ }, [state.input])
+}
+```
+
+**Incorrect: reading state from ref on submit**
+
+```tsx
+function ForwardMessageDialog() {
+ const stateRef = useRef(null)
+ return (
+
+ )
+}
+```
+
+**Correct: state lifted to provider**
+
+```tsx
+function ForwardMessageProvider({ children }: { children: React.ReactNode }) {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+
+function ForwardMessageDialog() {
+ return (
+
+
+
+ )
+}
+
+function ForwardButton() {
+ const { actions } = use(Composer.Context)
+ return
+}
+```
+
+The ForwardButton lives outside the Composer.Frame but still has access to the
+
+submit action because it's within the provider. Even though it's a one-off
+
+component, it can still access the composer's state and actions from outside the
+
+UI itself.
+
+**Key insight:** Components that need shared state don't have to be visually
+
+nested inside each other—they just need to be within the same provider.
+
+---
+
+## 3. Implementation Patterns
+
+**Impact: MEDIUM**
+
+Specific techniques for implementing compound components and
+context providers.
+
+### 3.1 Create Explicit Component Variants
+
+**Impact: MEDIUM (self-documenting code, no hidden conditionals)**
+
+Instead of one component with many boolean props, create explicit variant
+
+components. Each variant composes the pieces it needs. The code documents
+
+itself.
+
+**Incorrect: one component, many modes**
+
+```tsx
+// What does this component actually render?
+
+```
+
+**Correct: explicit variants**
+
+```tsx
+// Immediately clear what this renders
+
+
+// Or
+
+
+// Or
+
+```
+
+Each implementation is unique, explicit and self-contained. Yet they can each
+
+use shared parts.
+
+**Implementation:**
+
+```tsx
+function ThreadComposer({ channelId }: { channelId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+function EditMessageComposer({ messageId }: { messageId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+function ForwardMessageComposer({ messageId }: { messageId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+```
+
+Each variant is explicit about:
+
+- What provider/state it uses
+
+- What UI elements it includes
+
+- What actions are available
+
+No boolean prop combinations to reason about. No impossible states.
+
+### 3.2 Prefer Composing Children Over Render Props
+
+**Impact: MEDIUM (cleaner composition, better readability)**
+
+Use `children` for composition instead of `renderX` props. Children are more
+
+readable, compose naturally, and don't require understanding callback
+
+signatures.
+
+**Incorrect: render props**
+
+```tsx
+function Composer({
+ renderHeader,
+ renderFooter,
+ renderActions,
+}: {
+ renderHeader?: () => React.ReactNode
+ renderFooter?: () => React.ReactNode
+ renderActions?: () => React.ReactNode
+}) {
+ return (
+
+ )
+}
+
+// Usage is awkward and inflexible
+return (
+ }
+ renderFooter={() => (
+ <>
+
+
+
+ )}
+ renderActions={() => }
+ />
+)
+```
+
+**Correct: compound components with children**
+
+```tsx
+function ComposerFrame({ children }: { children: React.ReactNode }) {
+ return
+}
+
+function ComposerFooter({ children }: { children: React.ReactNode }) {
+ return
+}
+
+// Usage is flexible
+return (
+
+
+
+
+
+
+
+
+
+)
+```
+
+**When render props are appropriate:**
+
+```tsx
+// Render props work well when you need to pass data back
+}
+/>
+```
+
+Use render props when the parent needs to provide data or state to the child.
+
+Use children when composing static structure.
+
+---
+
+## 4. React 19 APIs
+
+**Impact: MEDIUM**
+
+React 19+ only. Don't use `forwardRef`; use `use()` instead of `useContext()`.
+
+### 4.1 React 19 API Changes
+
+**Impact: MEDIUM (cleaner component definitions and context usage)**
+
+> **⚠️ React 19+ only.** Skip this if you're on React 18 or earlier.
+
+In React 19, `ref` is now a regular prop (no `forwardRef` wrapper needed), and `use()` replaces `useContext()`.
+
+**Incorrect: forwardRef in React 19**
+
+```tsx
+const ComposerInput = forwardRef((props, ref) => {
+ return
+})
+```
+
+**Correct: ref as a regular prop**
+
+```tsx
+function ComposerInput({ ref, ...props }: Props & { ref?: React.Ref }) {
+ return
+}
+```
+
+**Incorrect: useContext in React 19**
+
+```tsx
+const value = useContext(MyContext)
+```
+
+**Correct: use instead of useContext**
+
+```tsx
+const value = use(MyContext)
+```
+
+`use()` can also be called conditionally, unlike `useContext()`.
+
+---
+
+## References
+
+1. [https://react.dev](https://react.dev)
+2. [https://react.dev/learn/passing-data-deeply-with-context](https://react.dev/learn/passing-data-deeply-with-context)
+3. [https://react.dev/reference/react/use](https://react.dev/reference/react/use)
diff --git a/.agents/skills/vercel-composition-patterns/SKILL.md b/.agents/skills/vercel-composition-patterns/SKILL.md
new file mode 100644
index 000000000000..d07025bf9433
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/SKILL.md
@@ -0,0 +1,89 @@
+---
+name: vercel-composition-patterns
+description:
+ React composition patterns that scale. Use when refactoring components with
+ boolean prop proliferation, building flexible component libraries, or
+ designing reusable APIs. Triggers on tasks involving compound components,
+ render props, context providers, or component architecture. Includes React 19
+ API changes.
+license: MIT
+metadata:
+ author: vercel
+ version: '1.0.0'
+---
+
+# React Composition Patterns
+
+Composition patterns for building flexible, maintainable React components. Avoid
+boolean prop proliferation by using compound components, lifting state, and
+composing internals. These patterns make codebases easier for both humans and AI
+agents to work with as they scale.
+
+## When to Apply
+
+Reference these guidelines when:
+
+- Refactoring components with many boolean props
+- Building reusable component libraries
+- Designing flexible component APIs
+- Reviewing component architecture
+- Working with compound components or context providers
+
+## Rule Categories by Priority
+
+| Priority | Category | Impact | Prefix |
+| -------- | ----------------------- | ------ | --------------- |
+| 1 | Component Architecture | HIGH | `architecture-` |
+| 2 | State Management | MEDIUM | `state-` |
+| 3 | Implementation Patterns | MEDIUM | `patterns-` |
+| 4 | React 19 APIs | MEDIUM | `react19-` |
+
+## Quick Reference
+
+### 1. Component Architecture (HIGH)
+
+- `architecture-avoid-boolean-props` - Don't add boolean props to customize
+ behavior; use composition
+- `architecture-compound-components` - Structure complex components with shared
+ context
+
+### 2. State Management (MEDIUM)
+
+- `state-decouple-implementation` - Provider is the only place that knows how
+ state is managed
+- `state-context-interface` - Define generic interface with state, actions, meta
+ for dependency injection
+- `state-lift-state` - Move state into provider components for sibling access
+
+### 3. Implementation Patterns (MEDIUM)
+
+- `patterns-explicit-variants` - Create explicit variant components instead of
+ boolean modes
+- `patterns-children-over-render-props` - Use children for composition instead
+ of renderX props
+
+### 4. React 19 APIs (MEDIUM)
+
+> **⚠️ React 19+ only.** Skip this section if using React 18 or earlier.
+
+- `react19-no-forwardref` - Don't use `forwardRef`; use `use()` instead of `useContext()`
+
+## How to Use
+
+Read individual rule files for detailed explanations and code examples:
+
+```
+rules/architecture-avoid-boolean-props.md
+rules/state-context-interface.md
+```
+
+Each rule file contains:
+
+- Brief explanation of why it matters
+- Incorrect code example with explanation
+- Correct code example with explanation
+- Additional context and references
+
+## Full Compiled Document
+
+For the complete guide with all rules expanded: `AGENTS.md`
diff --git a/.agents/skills/vercel-composition-patterns/rules/architecture-avoid-boolean-props.md b/.agents/skills/vercel-composition-patterns/rules/architecture-avoid-boolean-props.md
new file mode 100644
index 000000000000..ccee19ce495b
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/architecture-avoid-boolean-props.md
@@ -0,0 +1,100 @@
+---
+title: Avoid Boolean Prop Proliferation
+impact: CRITICAL
+impactDescription: prevents unmaintainable component variants
+tags: composition, props, architecture
+---
+
+## Avoid Boolean Prop Proliferation
+
+Don't add boolean props like `isThread`, `isEditing`, `isDMThread` to customize
+component behavior. Each boolean doubles possible states and creates
+unmaintainable conditional logic. Use composition instead.
+
+**Incorrect (boolean props create exponential complexity):**
+
+```tsx
+function Composer({
+ onSubmit,
+ isThread,
+ channelId,
+ isDMThread,
+ dmId,
+ isEditing,
+ isForwarding,
+}: Props) {
+ return (
+
+ )
+}
+```
+
+**Correct (composition eliminates conditionals):**
+
+```tsx
+// Channel composer
+function ChannelComposer() {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+// Thread composer - adds "also send to channel" field
+function ThreadComposer({ channelId }: { channelId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+// Edit composer - different footer actions
+function EditComposer() {
+ return (
+
+
+
+
+
+
+
+
+
+ )
+}
+```
+
+Each variant is explicit about what it renders. We can share internals without
+sharing a single monolithic parent.
diff --git a/.agents/skills/vercel-composition-patterns/rules/architecture-compound-components.md b/.agents/skills/vercel-composition-patterns/rules/architecture-compound-components.md
new file mode 100644
index 000000000000..e5e3043cb5a8
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/architecture-compound-components.md
@@ -0,0 +1,112 @@
+---
+title: Use Compound Components
+impact: HIGH
+impactDescription: enables flexible composition without prop drilling
+tags: composition, compound-components, architecture
+---
+
+## Use Compound Components
+
+Structure complex components as compound components with a shared context. Each
+subcomponent accesses shared state via context, not props. Consumers compose the
+pieces they need.
+
+**Incorrect (monolithic component with render props):**
+
+```tsx
+function Composer({
+ renderHeader,
+ renderFooter,
+ renderActions,
+ showAttachments,
+ showFormatting,
+ showEmojis,
+}: Props) {
+ return (
+
+ )
+}
+```
+
+**Correct (compound components with shared context):**
+
+```tsx
+const ComposerContext = createContext(null)
+
+function ComposerProvider({ children, state, actions, meta }: ProviderProps) {
+ return (
+
+ {children}
+
+ )
+}
+
+function ComposerFrame({ children }: { children: React.ReactNode }) {
+ return
+}
+
+function ComposerInput() {
+ const {
+ state,
+ actions: { update },
+ meta: { inputRef },
+ } = use(ComposerContext)
+ return (
+ update((s) => ({ ...s, input: text }))}
+ />
+ )
+}
+
+function ComposerSubmit() {
+ const {
+ actions: { submit },
+ } = use(ComposerContext)
+ return
+}
+
+// Export as compound component
+const Composer = {
+ Provider: ComposerProvider,
+ Frame: ComposerFrame,
+ Input: ComposerInput,
+ Submit: ComposerSubmit,
+ Header: ComposerHeader,
+ Footer: ComposerFooter,
+ Attachments: ComposerAttachments,
+ Formatting: ComposerFormatting,
+ Emojis: ComposerEmojis,
+}
+```
+
+**Usage:**
+
+```tsx
+
+
+
+
+
+
+
+
+
+
+```
+
+Consumers explicitly compose exactly what they need. No hidden conditionals. And the state, actions and meta are dependency-injected by a parent provider, allowing multiple usages of the same component structure.
diff --git a/.agents/skills/vercel-composition-patterns/rules/patterns-children-over-render-props.md b/.agents/skills/vercel-composition-patterns/rules/patterns-children-over-render-props.md
new file mode 100644
index 000000000000..d4345ee30aea
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/patterns-children-over-render-props.md
@@ -0,0 +1,87 @@
+---
+title: Prefer Composing Children Over Render Props
+impact: MEDIUM
+impactDescription: cleaner composition, better readability
+tags: composition, children, render-props
+---
+
+## Prefer Children Over Render Props
+
+Use `children` for composition instead of `renderX` props. Children are more
+readable, compose naturally, and don't require understanding callback
+signatures.
+
+**Incorrect (render props):**
+
+```tsx
+function Composer({
+ renderHeader,
+ renderFooter,
+ renderActions,
+}: {
+ renderHeader?: () => React.ReactNode
+ renderFooter?: () => React.ReactNode
+ renderActions?: () => React.ReactNode
+}) {
+ return (
+
+ )
+}
+
+// Usage is awkward and inflexible
+return (
+ }
+ renderFooter={() => (
+ <>
+
+
+
+ )}
+ renderActions={() => }
+ />
+)
+```
+
+**Correct (compound components with children):**
+
+```tsx
+function ComposerFrame({ children }: { children: React.ReactNode }) {
+ return
+}
+
+function ComposerFooter({ children }: { children: React.ReactNode }) {
+ return
+}
+
+// Usage is flexible
+return (
+
+
+
+
+
+
+
+
+
+)
+```
+
+**When render props are appropriate:**
+
+```tsx
+// Render props work well when you need to pass data back
+}
+/>
+```
+
+Use render props when the parent needs to provide data or state to the child.
+Use children when composing static structure.
diff --git a/.agents/skills/vercel-composition-patterns/rules/patterns-explicit-variants.md b/.agents/skills/vercel-composition-patterns/rules/patterns-explicit-variants.md
new file mode 100644
index 000000000000..56e32e8bee5e
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/patterns-explicit-variants.md
@@ -0,0 +1,100 @@
+---
+title: Create Explicit Component Variants
+impact: MEDIUM
+impactDescription: self-documenting code, no hidden conditionals
+tags: composition, variants, architecture
+---
+
+## Create Explicit Component Variants
+
+Instead of one component with many boolean props, create explicit variant
+components. Each variant composes the pieces it needs. The code documents
+itself.
+
+**Incorrect (one component, many modes):**
+
+```tsx
+// What does this component actually render?
+
+```
+
+**Correct (explicit variants):**
+
+```tsx
+// Immediately clear what this renders
+
+
+// Or
+
+
+// Or
+
+```
+
+Each implementation is unique, explicit and self-contained. Yet they can each
+use shared parts.
+
+**Implementation:**
+
+```tsx
+function ThreadComposer({ channelId }: { channelId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+function EditMessageComposer({ messageId }: { messageId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+
+ )
+}
+
+function ForwardMessageComposer({ messageId }: { messageId: string }) {
+ return (
+
+
+
+
+
+
+
+
+
+
+ )
+}
+```
+
+Each variant is explicit about:
+
+- What provider/state it uses
+- What UI elements it includes
+- What actions are available
+
+No boolean prop combinations to reason about. No impossible states.
diff --git a/.agents/skills/vercel-composition-patterns/rules/react19-no-forwardref.md b/.agents/skills/vercel-composition-patterns/rules/react19-no-forwardref.md
new file mode 100644
index 000000000000..e0d8f8a76f14
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/react19-no-forwardref.md
@@ -0,0 +1,42 @@
+---
+title: React 19 API Changes
+impact: MEDIUM
+impactDescription: cleaner component definitions and context usage
+tags: react19, refs, context, hooks
+---
+
+## React 19 API Changes
+
+> **⚠️ React 19+ only.** Skip this if you're on React 18 or earlier.
+
+In React 19, `ref` is now a regular prop (no `forwardRef` wrapper needed), and `use()` replaces `useContext()`.
+
+**Incorrect (forwardRef in React 19):**
+
+```tsx
+const ComposerInput = forwardRef((props, ref) => {
+ return
+})
+```
+
+**Correct (ref as a regular prop):**
+
+```tsx
+function ComposerInput({ ref, ...props }: Props & { ref?: React.Ref }) {
+ return
+}
+```
+
+**Incorrect (useContext in React 19):**
+
+```tsx
+const value = useContext(MyContext)
+```
+
+**Correct (use instead of useContext):**
+
+```tsx
+const value = use(MyContext)
+```
+
+`use()` can also be called conditionally, unlike `useContext()`.
diff --git a/.agents/skills/vercel-composition-patterns/rules/state-context-interface.md b/.agents/skills/vercel-composition-patterns/rules/state-context-interface.md
new file mode 100644
index 000000000000..d961bede0c6c
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/state-context-interface.md
@@ -0,0 +1,191 @@
+---
+title: Define Generic Context Interfaces for Dependency Injection
+impact: HIGH
+impactDescription: enables dependency-injectable state across use-cases
+tags: composition, context, state, typescript, dependency-injection
+---
+
+## Define Generic Context Interfaces for Dependency Injection
+
+Define a **generic interface** for your component context with three parts:
+`state`, `actions`, and `meta`. This interface is a contract that any provider
+can implement—enabling the same UI components to work with completely different
+state implementations.
+
+**Core principle:** Lift state, compose internals, make state
+dependency-injectable.
+
+**Incorrect (UI coupled to specific state implementation):**
+
+```tsx
+function ComposerInput() {
+ // Tightly coupled to a specific hook
+ const { input, setInput } = useChannelComposerState()
+ return
+}
+```
+
+**Correct (generic interface enables dependency injection):**
+
+```tsx
+// Define a GENERIC interface that any provider can implement
+interface ComposerState {
+ input: string
+ attachments: Attachment[]
+ isSubmitting: boolean
+}
+
+interface ComposerActions {
+ update: (updater: (state: ComposerState) => ComposerState) => void
+ submit: () => void
+}
+
+interface ComposerMeta {
+ inputRef: React.RefObject
+}
+
+interface ComposerContextValue {
+ state: ComposerState
+ actions: ComposerActions
+ meta: ComposerMeta
+}
+
+const ComposerContext = createContext(null)
+```
+
+**UI components consume the interface, not the implementation:**
+
+```tsx
+function ComposerInput() {
+ const {
+ state,
+ actions: { update },
+ meta,
+ } = use(ComposerContext)
+
+ // This component works with ANY provider that implements the interface
+ return (
+ update((s) => ({ ...s, input: text }))}
+ />
+ )
+}
+```
+
+**Different providers implement the same interface:**
+
+```tsx
+// Provider A: Local state for ephemeral forms
+function ForwardMessageProvider({ children }: { children: React.ReactNode }) {
+ const [state, setState] = useState(initialState)
+ const inputRef = useRef(null)
+ const submit = useForwardMessage()
+
+ return (
+
+ {children}
+
+ )
+}
+
+// Provider B: Global synced state for channels
+function ChannelProvider({ channelId, children }: Props) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**The same composed UI works with both:**
+
+```tsx
+// Works with ForwardMessageProvider (local state)
+
+
+
+
+
+
+
+// Works with ChannelProvider (global synced state)
+
+
+
+
+
+
+```
+
+**Custom UI outside the component can access state and actions:**
+
+The provider boundary is what matters—not the visual nesting. Components that
+need shared state don't have to be inside the `Composer.Frame`. They just need
+to be within the provider.
+
+```tsx
+function ForwardMessageDialog() {
+ return (
+
+
+
+ )
+}
+
+// This button lives OUTSIDE Composer.Frame but can still submit based on its context!
+function ForwardButton() {
+ const {
+ actions: { submit },
+ } = use(ComposerContext)
+ return
+}
+
+// This preview lives OUTSIDE Composer.Frame but can read composer's state!
+function MessagePreview() {
+ const { state } = use(ComposerContext)
+ return
+}
+```
+
+The `ForwardButton` and `MessagePreview` are not visually inside the composer
+box, but they can still access its state and actions. This is the power of
+lifting state into providers.
+
+The UI is reusable bits you compose together. The state is dependency-injected
+by the provider. Swap the provider, keep the UI.
diff --git a/.agents/skills/vercel-composition-patterns/rules/state-decouple-implementation.md b/.agents/skills/vercel-composition-patterns/rules/state-decouple-implementation.md
new file mode 100644
index 000000000000..71a5afaa7d70
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/state-decouple-implementation.md
@@ -0,0 +1,113 @@
+---
+title: Decouple State Management from UI
+impact: MEDIUM
+impactDescription: enables swapping state implementations without changing UI
+tags: composition, state, architecture
+---
+
+## Decouple State Management from UI
+
+The provider component should be the only place that knows how state is managed.
+UI components consume the context interface—they don't know if state comes from
+useState, Zustand, or a server sync.
+
+**Incorrect (UI coupled to state implementation):**
+
+```tsx
+function ChannelComposer({ channelId }: { channelId: string }) {
+ // UI component knows about global state implementation
+ const state = useGlobalChannelState(channelId)
+ const { submit, updateInput } = useChannelSync(channelId)
+
+ return (
+
+ sync.updateInput(text)}
+ />
+ sync.submit()} />
+
+ )
+}
+```
+
+**Correct (state management isolated in provider):**
+
+```tsx
+// Provider handles all state management details
+function ChannelProvider({
+ channelId,
+ children,
+}: {
+ channelId: string
+ children: React.ReactNode
+}) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+
+// UI component only knows about the context interface
+function ChannelComposer() {
+ return (
+
+
+
+
+
+
+
+ )
+}
+
+// Usage
+function Channel({ channelId }: { channelId: string }) {
+ return (
+
+
+
+ )
+}
+```
+
+**Different providers, same UI:**
+
+```tsx
+// Local state for ephemeral forms
+function ForwardMessageProvider({ children }) {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+
+ return (
+
+ {children}
+
+ )
+}
+
+// Global synced state for channels
+function ChannelProvider({ channelId, children }) {
+ const { state, update, submit } = useGlobalChannel(channelId)
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+The same `Composer.Input` component works with both providers because it only
+depends on the context interface, not the implementation.
diff --git a/.agents/skills/vercel-composition-patterns/rules/state-lift-state.md b/.agents/skills/vercel-composition-patterns/rules/state-lift-state.md
new file mode 100644
index 000000000000..d7fe27b54933
--- /dev/null
+++ b/.agents/skills/vercel-composition-patterns/rules/state-lift-state.md
@@ -0,0 +1,125 @@
+---
+title: Lift State into Provider Components
+impact: HIGH
+impactDescription: enables state sharing outside component boundaries
+tags: composition, state, context, providers
+---
+
+## Lift State into Provider Components
+
+Move state management into dedicated provider components. This allows sibling
+components outside the main UI to access and modify state without prop drilling
+or awkward refs.
+
+**Incorrect (state trapped inside component):**
+
+```tsx
+function ForwardMessageComposer() {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+
+ return (
+
+
+
+
+ )
+}
+
+// Problem: How does this button access composer state?
+function ForwardMessageDialog() {
+ return (
+
+ )
+}
+```
+
+**Incorrect (useEffect to sync state up):**
+
+```tsx
+function ForwardMessageDialog() {
+ const [input, setInput] = useState('')
+ return (
+
+ )
+}
+
+function ForwardMessageComposer({ onInputChange }) {
+ const [state, setState] = useState(initialState)
+ useEffect(() => {
+ onInputChange(state.input) // Sync on every change 😬
+ }, [state.input])
+}
+```
+
+**Incorrect (reading state from ref on submit):**
+
+```tsx
+function ForwardMessageDialog() {
+ const stateRef = useRef(null)
+ return (
+
+ )
+}
+```
+
+**Correct (state lifted to provider):**
+
+```tsx
+function ForwardMessageProvider({ children }: { children: React.ReactNode }) {
+ const [state, setState] = useState(initialState)
+ const forwardMessage = useForwardMessage()
+ const inputRef = useRef(null)
+
+ return (
+
+ {children}
+
+ )
+}
+
+function ForwardMessageDialog() {
+ return (
+
+
+
+ )
+}
+
+function ForwardButton() {
+ const { actions } = use(Composer.Context)
+ return
+}
+```
+
+The ForwardButton lives outside the Composer.Frame but still has access to the
+submit action because it's within the provider. Even though it's a one-off
+component, it can still access the composer's state and actions from outside the
+UI itself.
+
+**Key insight:** Components that need shared state don't have to be visually
+nested inside each other—they just need to be within the same provider.
diff --git a/.agents/skills/vercel-react-best-practices/AGENTS.md b/.agents/skills/vercel-react-best-practices/AGENTS.md
new file mode 100644
index 000000000000..db951abe78a8
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/AGENTS.md
@@ -0,0 +1,2934 @@
+# React Best Practices
+
+**Version 1.0.0**
+Vercel Engineering
+January 2026
+
+> **Note:**
+> This document is mainly for agents and LLMs to follow when maintaining,
+> generating, or refactoring React and Next.js codebases. Humans
+> may also find it useful, but guidance here is optimized for automation
+> and consistency by AI-assisted workflows.
+
+---
+
+## Abstract
+
+Comprehensive performance optimization guide for React and Next.js applications, designed for AI agents and LLMs. Contains 40+ rules across 8 categories, prioritized by impact from critical (eliminating waterfalls, reducing bundle size) to incremental (advanced patterns). Each rule includes detailed explanations, real-world examples comparing incorrect vs. correct implementations, and specific impact metrics to guide automated refactoring and code generation.
+
+---
+
+## Table of Contents
+
+1. [Eliminating Waterfalls](#1-eliminating-waterfalls) — **CRITICAL**
+ - 1.1 [Defer Await Until Needed](#11-defer-await-until-needed)
+ - 1.2 [Dependency-Based Parallelization](#12-dependency-based-parallelization)
+ - 1.3 [Prevent Waterfall Chains in API Routes](#13-prevent-waterfall-chains-in-api-routes)
+ - 1.4 [Promise.all() for Independent Operations](#14-promiseall-for-independent-operations)
+ - 1.5 [Strategic Suspense Boundaries](#15-strategic-suspense-boundaries)
+2. [Bundle Size Optimization](#2-bundle-size-optimization) — **CRITICAL**
+ - 2.1 [Avoid Barrel File Imports](#21-avoid-barrel-file-imports)
+ - 2.2 [Conditional Module Loading](#22-conditional-module-loading)
+ - 2.3 [Defer Non-Critical Third-Party Libraries](#23-defer-non-critical-third-party-libraries)
+ - 2.4 [Dynamic Imports for Heavy Components](#24-dynamic-imports-for-heavy-components)
+ - 2.5 [Preload Based on User Intent](#25-preload-based-on-user-intent)
+3. [Server-Side Performance](#3-server-side-performance) — **HIGH**
+ - 3.1 [Authenticate Server Actions Like API Routes](#31-authenticate-server-actions-like-api-routes)
+ - 3.2 [Avoid Duplicate Serialization in RSC Props](#32-avoid-duplicate-serialization-in-rsc-props)
+ - 3.3 [Cross-Request LRU Caching](#33-cross-request-lru-caching)
+ - 3.4 [Minimize Serialization at RSC Boundaries](#34-minimize-serialization-at-rsc-boundaries)
+ - 3.5 [Parallel Data Fetching with Component Composition](#35-parallel-data-fetching-with-component-composition)
+ - 3.6 [Per-Request Deduplication with React.cache()](#36-per-request-deduplication-with-reactcache)
+ - 3.7 [Use after() for Non-Blocking Operations](#37-use-after-for-non-blocking-operations)
+4. [Client-Side Data Fetching](#4-client-side-data-fetching) — **MEDIUM-HIGH**
+ - 4.1 [Deduplicate Global Event Listeners](#41-deduplicate-global-event-listeners)
+ - 4.2 [Use Passive Event Listeners for Scrolling Performance](#42-use-passive-event-listeners-for-scrolling-performance)
+ - 4.3 [Use SWR for Automatic Deduplication](#43-use-swr-for-automatic-deduplication)
+ - 4.4 [Version and Minimize localStorage Data](#44-version-and-minimize-localstorage-data)
+5. [Re-render Optimization](#5-re-render-optimization) — **MEDIUM**
+ - 5.1 [Calculate Derived State During Rendering](#51-calculate-derived-state-during-rendering)
+ - 5.2 [Defer State Reads to Usage Point](#52-defer-state-reads-to-usage-point)
+ - 5.3 [Do not wrap a simple expression with a primitive result type in useMemo](#53-do-not-wrap-a-simple-expression-with-a-primitive-result-type-in-usememo)
+ - 5.4 [Extract Default Non-primitive Parameter Value from Memoized Component to Constant](#54-extract-default-non-primitive-parameter-value-from-memoized-component-to-constant)
+ - 5.5 [Extract to Memoized Components](#55-extract-to-memoized-components)
+ - 5.6 [Narrow Effect Dependencies](#56-narrow-effect-dependencies)
+ - 5.7 [Put Interaction Logic in Event Handlers](#57-put-interaction-logic-in-event-handlers)
+ - 5.8 [Subscribe to Derived State](#58-subscribe-to-derived-state)
+ - 5.9 [Use Functional setState Updates](#59-use-functional-setstate-updates)
+ - 5.10 [Use Lazy State Initialization](#510-use-lazy-state-initialization)
+ - 5.11 [Use Transitions for Non-Urgent Updates](#511-use-transitions-for-non-urgent-updates)
+ - 5.12 [Use useRef for Transient Values](#512-use-useref-for-transient-values)
+6. [Rendering Performance](#6-rendering-performance) — **MEDIUM**
+ - 6.1 [Animate SVG Wrapper Instead of SVG Element](#61-animate-svg-wrapper-instead-of-svg-element)
+ - 6.2 [CSS content-visibility for Long Lists](#62-css-content-visibility-for-long-lists)
+ - 6.3 [Hoist Static JSX Elements](#63-hoist-static-jsx-elements)
+ - 6.4 [Optimize SVG Precision](#64-optimize-svg-precision)
+ - 6.5 [Prevent Hydration Mismatch Without Flickering](#65-prevent-hydration-mismatch-without-flickering)
+ - 6.6 [Suppress Expected Hydration Mismatches](#66-suppress-expected-hydration-mismatches)
+ - 6.7 [Use Activity Component for Show/Hide](#67-use-activity-component-for-showhide)
+ - 6.8 [Use Explicit Conditional Rendering](#68-use-explicit-conditional-rendering)
+ - 6.9 [Use useTransition Over Manual Loading States](#69-use-usetransition-over-manual-loading-states)
+7. [JavaScript Performance](#7-javascript-performance) — **LOW-MEDIUM**
+ - 7.1 [Avoid Layout Thrashing](#71-avoid-layout-thrashing)
+ - 7.2 [Build Index Maps for Repeated Lookups](#72-build-index-maps-for-repeated-lookups)
+ - 7.3 [Cache Property Access in Loops](#73-cache-property-access-in-loops)
+ - 7.4 [Cache Repeated Function Calls](#74-cache-repeated-function-calls)
+ - 7.5 [Cache Storage API Calls](#75-cache-storage-api-calls)
+ - 7.6 [Combine Multiple Array Iterations](#76-combine-multiple-array-iterations)
+ - 7.7 [Early Length Check for Array Comparisons](#77-early-length-check-for-array-comparisons)
+ - 7.8 [Early Return from Functions](#78-early-return-from-functions)
+ - 7.9 [Hoist RegExp Creation](#79-hoist-regexp-creation)
+ - 7.10 [Use Loop for Min/Max Instead of Sort](#710-use-loop-for-minmax-instead-of-sort)
+ - 7.11 [Use Set/Map for O(1) Lookups](#711-use-setmap-for-o1-lookups)
+ - 7.12 [Use toSorted() Instead of sort() for Immutability](#712-use-tosorted-instead-of-sort-for-immutability)
+8. [Advanced Patterns](#8-advanced-patterns) — **LOW**
+ - 8.1 [Initialize App Once, Not Per Mount](#81-initialize-app-once-not-per-mount)
+ - 8.2 [Store Event Handlers in Refs](#82-store-event-handlers-in-refs)
+ - 8.3 [useEffectEvent for Stable Callback Refs](#83-useeffectevent-for-stable-callback-refs)
+
+---
+
+## 1. Eliminating Waterfalls
+
+**Impact: CRITICAL**
+
+Waterfalls are the #1 performance killer. Each sequential await adds full network latency. Eliminating them yields the largest gains.
+
+### 1.1 Defer Await Until Needed
+
+**Impact: HIGH (avoids blocking unused code paths)**
+
+Move `await` operations into the branches where they're actually used to avoid blocking code paths that don't need them.
+
+**Incorrect: blocks both branches**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+ const userData = await fetchUserData(userId)
+
+ if (skipProcessing) {
+ // Returns immediately but still waited for userData
+ return { skipped: true }
+ }
+
+ // Only this branch uses userData
+ return processUserData(userData)
+}
+```
+
+**Correct: only blocks when needed**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+ if (skipProcessing) {
+ // Returns immediately without waiting
+ return { skipped: true }
+ }
+
+ // Fetch only when needed
+ const userData = await fetchUserData(userId)
+ return processUserData(userData)
+}
+```
+
+**Another example: early return optimization**
+
+```typescript
+// Incorrect: always fetches permissions
+async function updateResource(resourceId: string, userId: string) {
+ const permissions = await fetchPermissions(userId)
+ const resource = await getResource(resourceId)
+
+ if (!resource) {
+ return { error: 'Not found' }
+ }
+
+ if (!permissions.canEdit) {
+ return { error: 'Forbidden' }
+ }
+
+ return await updateResourceData(resource, permissions)
+}
+
+// Correct: fetches only when needed
+async function updateResource(resourceId: string, userId: string) {
+ const resource = await getResource(resourceId)
+
+ if (!resource) {
+ return { error: 'Not found' }
+ }
+
+ const permissions = await fetchPermissions(userId)
+
+ if (!permissions.canEdit) {
+ return { error: 'Forbidden' }
+ }
+
+ return await updateResourceData(resource, permissions)
+}
+```
+
+This optimization is especially valuable when the skipped branch is frequently taken, or when the deferred operation is expensive.
+
+### 1.2 Dependency-Based Parallelization
+
+**Impact: CRITICAL (2-10× improvement)**
+
+For operations with partial dependencies, use `better-all` to maximize parallelism. It automatically starts each task at the earliest possible moment.
+
+**Incorrect: profile waits for config unnecessarily**
+
+```typescript
+const [user, config] = await Promise.all([
+ fetchUser(),
+ fetchConfig()
+])
+const profile = await fetchProfile(user.id)
+```
+
+**Correct: config and profile run in parallel**
+
+```typescript
+import { all } from 'better-all'
+
+const { user, config, profile } = await all({
+ async user() { return fetchUser() },
+ async config() { return fetchConfig() },
+ async profile() {
+ return fetchProfile((await this.$.user).id)
+ }
+})
+```
+
+**Alternative without extra dependencies:**
+
+```typescript
+const userPromise = fetchUser()
+const profilePromise = userPromise.then(user => fetchProfile(user.id))
+
+const [user, config, profile] = await Promise.all([
+ userPromise,
+ fetchConfig(),
+ profilePromise
+])
+```
+
+We can also create all the promises first, and do `Promise.all()` at the end.
+
+Reference: [https://github.com/shuding/better-all](https://github.com/shuding/better-all)
+
+### 1.3 Prevent Waterfall Chains in API Routes
+
+**Impact: CRITICAL (2-10× improvement)**
+
+In API routes and Server Actions, start independent operations immediately, even if you don't await them yet.
+
+**Incorrect: config waits for auth, data waits for both**
+
+```typescript
+export async function GET(request: Request) {
+ const session = await auth()
+ const config = await fetchConfig()
+ const data = await fetchData(session.user.id)
+ return Response.json({ data, config })
+}
+```
+
+**Correct: auth and config start immediately**
+
+```typescript
+export async function GET(request: Request) {
+ const sessionPromise = auth()
+ const configPromise = fetchConfig()
+ const session = await sessionPromise
+ const [config, data] = await Promise.all([
+ configPromise,
+ fetchData(session.user.id)
+ ])
+ return Response.json({ data, config })
+}
+```
+
+For operations with more complex dependency chains, use `better-all` to automatically maximize parallelism (see Dependency-Based Parallelization).
+
+### 1.4 Promise.all() for Independent Operations
+
+**Impact: CRITICAL (2-10× improvement)**
+
+When async operations have no interdependencies, execute them concurrently using `Promise.all()`.
+
+**Incorrect: sequential execution, 3 round trips**
+
+```typescript
+const user = await fetchUser()
+const posts = await fetchPosts()
+const comments = await fetchComments()
+```
+
+**Correct: parallel execution, 1 round trip**
+
+```typescript
+const [user, posts, comments] = await Promise.all([
+ fetchUser(),
+ fetchPosts(),
+ fetchComments()
+])
+```
+
+### 1.5 Strategic Suspense Boundaries
+
+**Impact: HIGH (faster initial paint)**
+
+Instead of awaiting data in async components before returning JSX, use Suspense boundaries to show the wrapper UI faster while data loads.
+
+**Incorrect: wrapper blocked by data fetching**
+
+```tsx
+async function Page() {
+ const data = await fetchData() // Blocks entire page
+
+ return (
+
+
Sidebar
+
Header
+
+
+
+
Footer
+
+ )
+}
+```
+
+The entire layout waits for data even though only the middle section needs it.
+
+**Correct: wrapper shows immediately, data streams in**
+
+```tsx
+function Page() {
+ return (
+
+
Sidebar
+
Header
+
+ }>
+
+
+
+
Footer
+
+ )
+}
+
+async function DataDisplay() {
+ const data = await fetchData() // Only blocks this component
+ return
{data.content}
+}
+```
+
+Sidebar, Header, and Footer render immediately. Only DataDisplay waits for data.
+
+**Alternative: share promise across components**
+
+```tsx
+function Page() {
+ // Start fetch immediately, but don't await
+ const dataPromise = fetchData()
+
+ return (
+
+}
+```
+
+Reference: [https://react.dev/learn/you-might-not-need-an-effect](https://react.dev/learn/you-might-not-need-an-effect)
+
+### 5.2 Defer State Reads to Usage Point
+
+**Impact: MEDIUM (avoids unnecessary subscriptions)**
+
+Don't subscribe to dynamic state (searchParams, localStorage) if you only read it inside callbacks.
+
+**Incorrect: subscribes to all searchParams changes**
+
+```tsx
+function ShareButton({ chatId }: { chatId: string }) {
+ const searchParams = useSearchParams()
+
+ const handleShare = () => {
+ const ref = searchParams.get('ref')
+ shareChat(chatId, { ref })
+ }
+
+ return
+}
+```
+
+**Correct: reads on demand, no subscription**
+
+```tsx
+function ShareButton({ chatId }: { chatId: string }) {
+ const handleShare = () => {
+ const params = new URLSearchParams(window.location.search)
+ const ref = params.get('ref')
+ shareChat(chatId, { ref })
+ }
+
+ return
+}
+```
+
+### 5.3 Do not wrap a simple expression with a primitive result type in useMemo
+
+**Impact: LOW-MEDIUM (wasted computation on every render)**
+
+When an expression is simple (few logical or arithmetical operators) and has a primitive result type (boolean, number, string), do not wrap it in `useMemo`.
+
+Calling `useMemo` and comparing hook dependencies may consume more resources than the expression itself.
+
+**Incorrect:**
+
+```tsx
+function Header({ user, notifications }: Props) {
+ const isLoading = useMemo(() => {
+ return user.isLoading || notifications.isLoading
+ }, [user.isLoading, notifications.isLoading])
+
+ if (isLoading) return
+ // return some markup
+}
+```
+
+**Correct:**
+
+```tsx
+function Header({ user, notifications }: Props) {
+ const isLoading = user.isLoading || notifications.isLoading
+
+ if (isLoading) return
+ // return some markup
+}
+```
+
+### 5.4 Extract Default Non-primitive Parameter Value from Memoized Component to Constant
+
+**Impact: MEDIUM (restores memoization by using a constant for default value)**
+
+When memoized component has a default value for some non-primitive optional parameter, such as an array, function, or object, calling the component without that parameter results in broken memoization. This is because new value instances are created on every rerender, and they do not pass strict equality comparison in `memo()`.
+
+To address this issue, extract the default value into a constant.
+
+**Incorrect: `onClick` has different values on every rerender**
+
+```tsx
+const UserAvatar = memo(function UserAvatar({ onClick = () => {} }: { onClick?: () => void }) {
+ // ...
+})
+
+// Used without optional onClick
+
+```
+
+**Correct: stable default value**
+
+```tsx
+const NOOP = () => {};
+
+const UserAvatar = memo(function UserAvatar({ onClick = NOOP }: { onClick?: () => void }) {
+ // ...
+})
+
+// Used without optional onClick
+
+```
+
+### 5.5 Extract to Memoized Components
+
+**Impact: MEDIUM (enables early returns)**
+
+Extract expensive work into memoized components to enable early returns before computation.
+
+**Incorrect: computes avatar even when loading**
+
+```tsx
+function Profile({ user, loading }: Props) {
+ const avatar = useMemo(() => {
+ const id = computeAvatarId(user)
+ return
+ }, [user])
+
+ if (loading) return
+ return
{avatar}
+}
+```
+
+**Correct: skips computation when loading**
+
+```tsx
+const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {
+ const id = useMemo(() => computeAvatarId(user), [user])
+ return
+})
+
+function Profile({ user, loading }: Props) {
+ if (loading) return
+ return (
+
+
+
+ )
+}
+```
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, manual memoization with `memo()` and `useMemo()` is not necessary. The compiler automatically optimizes re-renders.
+
+### 5.6 Narrow Effect Dependencies
+
+**Impact: LOW (minimizes effect re-runs)**
+
+Specify primitive dependencies instead of objects to minimize effect re-runs.
+
+**Incorrect: re-runs on any user field change**
+
+```tsx
+useEffect(() => {
+ console.log(user.id)
+}, [user])
+```
+
+**Correct: re-runs only when id changes**
+
+```tsx
+useEffect(() => {
+ console.log(user.id)
+}, [user.id])
+```
+
+**For derived state, compute outside effect:**
+
+```tsx
+// Incorrect: runs on width=767, 766, 765...
+useEffect(() => {
+ if (width < 768) {
+ enableMobileMode()
+ }
+}, [width])
+
+// Correct: runs only on boolean transition
+const isMobile = width < 768
+useEffect(() => {
+ if (isMobile) {
+ enableMobileMode()
+ }
+}, [isMobile])
+```
+
+### 5.7 Put Interaction Logic in Event Handlers
+
+**Impact: MEDIUM (avoids effect re-runs and duplicate side effects)**
+
+If a side effect is triggered by a specific user action (submit, click, drag), run it in that event handler. Do not model the action as state + effect; it makes effects re-run on unrelated changes and can duplicate the action.
+
+**Incorrect: event modeled as state + effect**
+
+```tsx
+function Form() {
+ const [submitted, setSubmitted] = useState(false)
+ const theme = useContext(ThemeContext)
+
+ useEffect(() => {
+ if (submitted) {
+ post('/api/register')
+ showToast('Registered', theme)
+ }
+ }, [submitted, theme])
+
+ return
+}
+```
+
+**Correct: do it in the handler**
+
+```tsx
+function Form() {
+ const theme = useContext(ThemeContext)
+
+ function handleSubmit() {
+ post('/api/register')
+ showToast('Registered', theme)
+ }
+
+ return
+}
+```
+
+Reference: [https://react.dev/learn/removing-effect-dependencies#should-this-code-move-to-an-event-handler](https://react.dev/learn/removing-effect-dependencies#should-this-code-move-to-an-event-handler)
+
+### 5.8 Subscribe to Derived State
+
+**Impact: MEDIUM (reduces re-render frequency)**
+
+Subscribe to derived boolean state instead of continuous values to reduce re-render frequency.
+
+**Incorrect: re-renders on every pixel change**
+
+```tsx
+function Sidebar() {
+ const width = useWindowWidth() // updates continuously
+ const isMobile = width < 768
+ return
+}
+```
+
+**Correct: re-renders only when boolean changes**
+
+```tsx
+function Sidebar() {
+ const isMobile = useMediaQuery('(max-width: 767px)')
+ return
+}
+```
+
+### 5.9 Use Functional setState Updates
+
+**Impact: MEDIUM (prevents stale closures and unnecessary callback recreations)**
+
+When updating state based on the current state value, use the functional update form of setState instead of directly referencing the state variable. This prevents stale closures, eliminates unnecessary dependencies, and creates stable callback references.
+
+**Incorrect: requires state as dependency**
+
+```tsx
+function TodoList() {
+ const [items, setItems] = useState(initialItems)
+
+ // Callback must depend on items, recreated on every items change
+ const addItems = useCallback((newItems: Item[]) => {
+ setItems([...items, ...newItems])
+ }, [items]) // ❌ items dependency causes recreations
+
+ // Risk of stale closure if dependency is forgotten
+ const removeItem = useCallback((id: string) => {
+ setItems(items.filter(item => item.id !== id))
+ }, []) // ❌ Missing items dependency - will use stale items!
+
+ return
+}
+```
+
+The first callback is recreated every time `items` changes, which can cause child components to re-render unnecessarily. The second callback has a stale closure bug—it will always reference the initial `items` value.
+
+**Correct: stable callbacks, no stale closures**
+
+```tsx
+function TodoList() {
+ const [items, setItems] = useState(initialItems)
+
+ // Stable callback, never recreated
+ const addItems = useCallback((newItems: Item[]) => {
+ setItems(curr => [...curr, ...newItems])
+ }, []) // ✅ No dependencies needed
+
+ // Always uses latest state, no stale closure risk
+ const removeItem = useCallback((id: string) => {
+ setItems(curr => curr.filter(item => item.id !== id))
+ }, []) // ✅ Safe and stable
+
+ return
+}
+```
+
+**Benefits:**
+
+1. **Stable callback references** - Callbacks don't need to be recreated when state changes
+
+2. **No stale closures** - Always operates on the latest state value
+
+3. **Fewer dependencies** - Simplifies dependency arrays and reduces memory leaks
+
+4. **Prevents bugs** - Eliminates the most common source of React closure bugs
+
+**When to use functional updates:**
+
+- Any setState that depends on the current state value
+
+- Inside useCallback/useMemo when state is needed
+
+- Event handlers that reference state
+
+- Async operations that update state
+
+**When direct updates are fine:**
+
+- Setting state to a static value: `setCount(0)`
+
+- Setting state from props/arguments only: `setName(newName)`
+
+- State doesn't depend on previous value
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler can automatically optimize some cases, but functional updates are still recommended for correctness and to prevent stale closure bugs.
+
+### 5.10 Use Lazy State Initialization
+
+**Impact: MEDIUM (wasted computation on every render)**
+
+Pass a function to `useState` for expensive initial values. Without the function form, the initializer runs on every render even though the value is only used once.
+
+**Incorrect: runs on every render**
+
+```tsx
+function FilteredList({ items }: { items: Item[] }) {
+ // buildSearchIndex() runs on EVERY render, even after initialization
+ const [searchIndex, setSearchIndex] = useState(buildSearchIndex(items))
+ const [query, setQuery] = useState('')
+
+ // When query changes, buildSearchIndex runs again unnecessarily
+ return
+}
+
+function UserProfile() {
+ // JSON.parse runs on every render
+ const [settings, setSettings] = useState(
+ JSON.parse(localStorage.getItem('settings') || '{}')
+ )
+
+ return
+}
+```
+
+**Correct: runs only once**
+
+```tsx
+function FilteredList({ items }: { items: Item[] }) {
+ // buildSearchIndex() runs ONLY on initial render
+ const [searchIndex, setSearchIndex] = useState(() => buildSearchIndex(items))
+ const [query, setQuery] = useState('')
+
+ return
+}
+
+function UserProfile() {
+ // JSON.parse runs only on initial render
+ const [settings, setSettings] = useState(() => {
+ const stored = localStorage.getItem('settings')
+ return stored ? JSON.parse(stored) : {}
+ })
+
+ return
+}
+```
+
+Use lazy initialization when computing initial values from localStorage/sessionStorage, building data structures (indexes, maps), reading from the DOM, or performing heavy transformations.
+
+For simple primitives (`useState(0)`), direct references (`useState(props.value)`), or cheap literals (`useState({})`), the function form is unnecessary.
+
+### 5.11 Use Transitions for Non-Urgent Updates
+
+**Impact: MEDIUM (maintains UI responsiveness)**
+
+Mark frequent, non-urgent state updates as transitions to maintain UI responsiveness.
+
+**Incorrect: blocks UI on every scroll**
+
+```tsx
+function ScrollTracker() {
+ const [scrollY, setScrollY] = useState(0)
+ useEffect(() => {
+ const handler = () => setScrollY(window.scrollY)
+ window.addEventListener('scroll', handler, { passive: true })
+ return () => window.removeEventListener('scroll', handler)
+ }, [])
+}
+```
+
+**Correct: non-blocking updates**
+
+```tsx
+import { startTransition } from 'react'
+
+function ScrollTracker() {
+ const [scrollY, setScrollY] = useState(0)
+ useEffect(() => {
+ const handler = () => {
+ startTransition(() => setScrollY(window.scrollY))
+ }
+ window.addEventListener('scroll', handler, { passive: true })
+ return () => window.removeEventListener('scroll', handler)
+ }, [])
+}
+```
+
+### 5.12 Use useRef for Transient Values
+
+**Impact: MEDIUM (avoids unnecessary re-renders on frequent updates)**
+
+When a value changes frequently and you don't want a re-render on every update (e.g., mouse trackers, intervals, transient flags), store it in `useRef` instead of `useState`. Keep component state for UI; use refs for temporary DOM-adjacent values. Updating a ref does not trigger a re-render.
+
+**Incorrect: renders every update**
+
+```tsx
+function Tracker() {
+ const [lastX, setLastX] = useState(0)
+
+ useEffect(() => {
+ const onMove = (e: MouseEvent) => setLastX(e.clientX)
+ window.addEventListener('mousemove', onMove)
+ return () => window.removeEventListener('mousemove', onMove)
+ }, [])
+
+ return (
+
+ )
+}
+```
+
+**Correct: no re-render for tracking**
+
+```tsx
+function Tracker() {
+ const lastXRef = useRef(0)
+ const dotRef = useRef(null)
+
+ useEffect(() => {
+ const onMove = (e: MouseEvent) => {
+ lastXRef.current = e.clientX
+ const node = dotRef.current
+ if (node) {
+ node.style.transform = `translateX(${e.clientX}px)`
+ }
+ }
+ window.addEventListener('mousemove', onMove)
+ return () => window.removeEventListener('mousemove', onMove)
+ }, [])
+
+ return (
+
+ )
+}
+```
+
+---
+
+## 6. Rendering Performance
+
+**Impact: MEDIUM**
+
+Optimizing the rendering process reduces the work the browser needs to do.
+
+### 6.1 Animate SVG Wrapper Instead of SVG Element
+
+**Impact: LOW (enables hardware acceleration)**
+
+Many browsers don't have hardware acceleration for CSS3 animations on SVG elements. Wrap SVG in a `
+ )
+}
+```
+
+This is especially helpful for large and static SVG nodes, which can be expensive to recreate on every render.
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler automatically hoists static JSX elements and optimizes component re-renders, making manual hoisting unnecessary.
+
+### 6.4 Optimize SVG Precision
+
+**Impact: LOW (reduces file size)**
+
+Reduce SVG coordinate precision to decrease file size. The optimal precision depends on the viewBox size, but in general reducing precision should be considered.
+
+**Incorrect: excessive precision**
+
+```svg
+
+```
+
+**Correct: 1 decimal place**
+
+```svg
+
+```
+
+**Automate with SVGO:**
+
+```bash
+npx svgo --precision=1 --multipass icon.svg
+```
+
+### 6.5 Prevent Hydration Mismatch Without Flickering
+
+**Impact: MEDIUM (avoids visual flicker and hydration errors)**
+
+When rendering content that depends on client-side storage (localStorage, cookies), avoid both SSR breakage and post-hydration flickering by injecting a synchronous script that updates the DOM before React hydrates.
+
+**Incorrect: breaks SSR**
+
+```tsx
+function ThemeWrapper({ children }: { children: ReactNode }) {
+ // localStorage is not available on server - throws error
+ const theme = localStorage.getItem('theme') || 'light'
+
+ return (
+
+ )
+}
+```
+
+Component first renders with default value (`light`), then updates after hydration, causing a visible flash of incorrect content.
+
+**Correct: no flicker, no hydration mismatch**
+
+```tsx
+function ThemeWrapper({ children }: { children: ReactNode }) {
+ return (
+ <>
+
+ {children}
+
+
+
+ )
+}
+```
+
+The inline script executes synchronously before showing the element, ensuring the DOM already has the correct value. No flickering, no hydration mismatch.
+
+This pattern is especially useful for theme toggles, user preferences, authentication states, and any client-only data that should render immediately without flashing default values.
+
+### 6.6 Suppress Expected Hydration Mismatches
+
+**Impact: LOW-MEDIUM (avoids noisy hydration warnings for known differences)**
+
+In SSR frameworks (e.g., Next.js), some values are intentionally different on server vs client (random IDs, dates, locale/timezone formatting). For these *expected* mismatches, wrap the dynamic text in an element with `suppressHydrationWarning` to prevent noisy warnings. Do not use this to hide real bugs. Don’t overuse it.
+
+**Incorrect: known mismatch warnings**
+
+```tsx
+function Timestamp() {
+ return {new Date().toLocaleString()}
+}
+```
+
+**Correct: suppress expected mismatch only**
+
+```tsx
+function Timestamp() {
+ return (
+
+ {new Date().toLocaleString()}
+
+ )
+}
+```
+
+### 6.7 Use Activity Component for Show/Hide
+
+**Impact: MEDIUM (preserves state/DOM)**
+
+Use React's `` to preserve state/DOM for expensive components that frequently toggle visibility.
+
+**Usage:**
+
+```tsx
+import { Activity } from 'react'
+
+function Dropdown({ isOpen }: Props) {
+ return (
+
+
+
+ )
+}
+```
+
+Avoids expensive re-renders and state loss.
+
+### 6.8 Use Explicit Conditional Rendering
+
+**Impact: LOW (prevents rendering 0 or NaN)**
+
+Use explicit ternary operators (`? :`) instead of `&&` for conditional rendering when the condition can be `0`, `NaN`, or other falsy values that render.
+
+**Incorrect: renders "0" when count is 0**
+
+```tsx
+function Badge({ count }: { count: number }) {
+ return (
+
+ {count && {count}}
+
+ )
+}
+
+// When count = 0, renders:
0
+// When count = 5, renders:
5
+```
+
+**Correct: renders nothing when count is 0**
+
+```tsx
+function Badge({ count }: { count: number }) {
+ return (
+
+ {count > 0 ? {count} : null}
+
+ )
+}
+
+// When count = 0, renders:
+// When count = 5, renders:
5
+```
+
+### 6.9 Use useTransition Over Manual Loading States
+
+**Impact: LOW (reduces re-renders and improves code clarity)**
+
+Use `useTransition` instead of manual `useState` for loading states. This provides built-in `isPending` state and automatically manages transitions.
+
+**Incorrect: manual loading state**
+
+```tsx
+function SearchResults() {
+ const [query, setQuery] = useState('')
+ const [results, setResults] = useState([])
+ const [isLoading, setIsLoading] = useState(false)
+
+ const handleSearch = async (value: string) => {
+ setIsLoading(true)
+ setQuery(value)
+ const data = await fetchResults(value)
+ setResults(data)
+ setIsLoading(false)
+ }
+
+ return (
+ <>
+ handleSearch(e.target.value)} />
+ {isLoading && }
+
+
+ )
+}
+```
+
+**Correct: useTransition with built-in pending state**
+
+```tsx
+import { useTransition, useState } from 'react'
+
+function SearchResults() {
+ const [query, setQuery] = useState('')
+ const [results, setResults] = useState([])
+ const [isPending, startTransition] = useTransition()
+
+ const handleSearch = (value: string) => {
+ setQuery(value) // Update input immediately
+
+ startTransition(async () => {
+ // Fetch and update results
+ const data = await fetchResults(value)
+ setResults(data)
+ })
+ }
+
+ return (
+ <>
+ handleSearch(e.target.value)} />
+ {isPending && }
+
+
+ )
+}
+```
+
+**Benefits:**
+
+- **Automatic pending state**: No need to manually manage `setIsLoading(true/false)`
+
+- **Error resilience**: Pending state correctly resets even if the transition throws
+
+- **Better responsiveness**: Keeps the UI responsive during updates
+
+- **Interrupt handling**: New transitions automatically cancel pending ones
+
+Reference: [https://react.dev/reference/react/useTransition](https://react.dev/reference/react/useTransition)
+
+---
+
+## 7. JavaScript Performance
+
+**Impact: LOW-MEDIUM**
+
+Micro-optimizations for hot paths can add up to meaningful improvements.
+
+### 7.1 Avoid Layout Thrashing
+
+**Impact: MEDIUM (prevents forced synchronous layouts and reduces performance bottlenecks)**
+
+Avoid interleaving style writes with layout reads. When you read a layout property (like `offsetWidth`, `getBoundingClientRect()`, or `getComputedStyle()`) between style changes, the browser is forced to trigger a synchronous reflow.
+
+**This is OK: browser batches style changes**
+
+```typescript
+function updateElementStyles(element: HTMLElement) {
+ // Each line invalidates style, but browser batches the recalculation
+ element.style.width = '100px'
+ element.style.height = '200px'
+ element.style.backgroundColor = 'blue'
+ element.style.border = '1px solid black'
+}
+```
+
+**Incorrect: interleaved reads and writes force reflows**
+
+```typescript
+function layoutThrashing(element: HTMLElement) {
+ element.style.width = '100px'
+ const width = element.offsetWidth // Forces reflow
+ element.style.height = '200px'
+ const height = element.offsetHeight // Forces another reflow
+}
+```
+
+**Correct: batch writes, then read once**
+
+```typescript
+function updateElementStyles(element: HTMLElement) {
+ // Batch all writes together
+ element.style.width = '100px'
+ element.style.height = '200px'
+ element.style.backgroundColor = 'blue'
+ element.style.border = '1px solid black'
+
+ // Read after all writes are done (single reflow)
+ const { width, height } = element.getBoundingClientRect()
+}
+```
+
+**Correct: batch reads, then writes**
+
+```typescript
+function updateElementStyles(element: HTMLElement) {
+ element.classList.add('highlighted-box')
+
+ const { width, height } = element.getBoundingClientRect()
+}
+```
+
+**Better: use CSS classes**
+
+**React example:**
+
+```tsx
+// Incorrect: interleaving style changes with layout queries
+function Box({ isHighlighted }: { isHighlighted: boolean }) {
+ const ref = useRef(null)
+
+ useEffect(() => {
+ if (ref.current && isHighlighted) {
+ ref.current.style.width = '100px'
+ const width = ref.current.offsetWidth // Forces layout
+ ref.current.style.height = '200px'
+ }
+ }, [isHighlighted])
+
+ return
+}
+```
+
+**Why this matters in React:**
+
+1. Props/state mutations break React's immutability model - React expects props and state to be treated as read-only
+
+2. Causes stale closure bugs - Mutating arrays inside closures (callbacks, effects) can lead to unexpected behavior
+
+**Browser support: fallback for older browsers**
+
+```typescript
+// Fallback for older browsers
+const sorted = [...items].sort((a, b) => a.value - b.value)
+```
+
+`.toSorted()` is available in all modern browsers (Chrome 110+, Safari 16+, Firefox 115+, Node.js 20+). For older environments, use spread operator:
+
+**Other immutable array methods:**
+
+- `.toSorted()` - immutable sort
+
+- `.toReversed()` - immutable reverse
+
+- `.toSpliced()` - immutable splice
+
+- `.with()` - immutable element replacement
+
+---
+
+## 8. Advanced Patterns
+
+**Impact: LOW**
+
+Advanced patterns for specific cases that require careful implementation.
+
+### 8.1 Initialize App Once, Not Per Mount
+
+**Impact: LOW-MEDIUM (avoids duplicate init in development)**
+
+Do not put app-wide initialization that must run once per app load inside `useEffect([])` of a component. Components can remount and effects will re-run. Use a module-level guard or top-level init in the entry module instead.
+
+**Incorrect: runs twice in dev, re-runs on remount**
+
+```tsx
+function Comp() {
+ useEffect(() => {
+ loadFromStorage()
+ checkAuthToken()
+ }, [])
+
+ // ...
+}
+```
+
+**Correct: once per app load**
+
+```tsx
+let didInit = false
+
+function Comp() {
+ useEffect(() => {
+ if (didInit) return
+ didInit = true
+ loadFromStorage()
+ checkAuthToken()
+ }, [])
+
+ // ...
+}
+```
+
+Reference: [https://react.dev/learn/you-might-not-need-an-effect#initializing-the-application](https://react.dev/learn/you-might-not-need-an-effect#initializing-the-application)
+
+### 8.2 Store Event Handlers in Refs
+
+**Impact: LOW (stable subscriptions)**
+
+Store callbacks in refs when used in effects that shouldn't re-subscribe on callback changes.
+
+**Incorrect: re-subscribes on every render**
+
+```tsx
+function useWindowEvent(event: string, handler: (e) => void) {
+ useEffect(() => {
+ window.addEventListener(event, handler)
+ return () => window.removeEventListener(event, handler)
+ }, [event, handler])
+}
+```
+
+**Correct: stable subscription**
+
+```tsx
+import { useEffectEvent } from 'react'
+
+function useWindowEvent(event: string, handler: (e) => void) {
+ const onEvent = useEffectEvent(handler)
+
+ useEffect(() => {
+ window.addEventListener(event, onEvent)
+ return () => window.removeEventListener(event, onEvent)
+ }, [event])
+}
+```
+
+**Alternative: use `useEffectEvent` if you're on latest React:**
+
+`useEffectEvent` provides a cleaner API for the same pattern: it creates a stable function reference that always calls the latest version of the handler.
+
+### 8.3 useEffectEvent for Stable Callback Refs
+
+**Impact: LOW (prevents effect re-runs)**
+
+Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
+
+**Incorrect: effect re-runs on every callback change**
+
+```tsx
+function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
+ const [query, setQuery] = useState('')
+
+ useEffect(() => {
+ const timeout = setTimeout(() => onSearch(query), 300)
+ return () => clearTimeout(timeout)
+ }, [query, onSearch])
+}
+```
+
+**Correct: using React's useEffectEvent**
+
+```tsx
+import { useEffectEvent } from 'react';
+
+function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
+ const [query, setQuery] = useState('')
+ const onSearchEvent = useEffectEvent(onSearch)
+
+ useEffect(() => {
+ const timeout = setTimeout(() => onSearchEvent(query), 300)
+ return () => clearTimeout(timeout)
+ }, [query])
+}
+```
+
+---
+
+## References
+
+1. [https://react.dev](https://react.dev)
+2. [https://nextjs.org](https://nextjs.org)
+3. [https://swr.vercel.app](https://swr.vercel.app)
+4. [https://github.com/shuding/better-all](https://github.com/shuding/better-all)
+5. [https://github.com/isaacs/node-lru-cache](https://github.com/isaacs/node-lru-cache)
+6. [https://vercel.com/blog/how-we-optimized-package-imports-in-next-js](https://vercel.com/blog/how-we-optimized-package-imports-in-next-js)
+7. [https://vercel.com/blog/how-we-made-the-vercel-dashboard-twice-as-fast](https://vercel.com/blog/how-we-made-the-vercel-dashboard-twice-as-fast)
diff --git a/.agents/skills/vercel-react-best-practices/SKILL.md b/.agents/skills/vercel-react-best-practices/SKILL.md
new file mode 100644
index 000000000000..1ad7750e572f
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/SKILL.md
@@ -0,0 +1,136 @@
+---
+name: vercel-react-best-practices
+description: React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
+license: MIT
+metadata:
+ author: vercel
+ version: "1.0.0"
+---
+
+# Vercel React Best Practices
+
+Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 57 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
+
+## When to Apply
+
+Reference these guidelines when:
+- Writing new React components or Next.js pages
+- Implementing data fetching (client or server-side)
+- Reviewing code for performance issues
+- Refactoring existing React/Next.js code
+- Optimizing bundle size or load times
+
+## Rule Categories by Priority
+
+| Priority | Category | Impact | Prefix |
+|----------|----------|--------|--------|
+| 1 | Eliminating Waterfalls | CRITICAL | `async-` |
+| 2 | Bundle Size Optimization | CRITICAL | `bundle-` |
+| 3 | Server-Side Performance | HIGH | `server-` |
+| 4 | Client-Side Data Fetching | MEDIUM-HIGH | `client-` |
+| 5 | Re-render Optimization | MEDIUM | `rerender-` |
+| 6 | Rendering Performance | MEDIUM | `rendering-` |
+| 7 | JavaScript Performance | LOW-MEDIUM | `js-` |
+| 8 | Advanced Patterns | LOW | `advanced-` |
+
+## Quick Reference
+
+### 1. Eliminating Waterfalls (CRITICAL)
+
+- `async-defer-await` - Move await into branches where actually used
+- `async-parallel` - Use Promise.all() for independent operations
+- `async-dependencies` - Use better-all for partial dependencies
+- `async-api-routes` - Start promises early, await late in API routes
+- `async-suspense-boundaries` - Use Suspense to stream content
+
+### 2. Bundle Size Optimization (CRITICAL)
+
+- `bundle-barrel-imports` - Import directly, avoid barrel files
+- `bundle-dynamic-imports` - Use next/dynamic for heavy components
+- `bundle-defer-third-party` - Load analytics/logging after hydration
+- `bundle-conditional` - Load modules only when feature is activated
+- `bundle-preload` - Preload on hover/focus for perceived speed
+
+### 3. Server-Side Performance (HIGH)
+
+- `server-auth-actions` - Authenticate server actions like API routes
+- `server-cache-react` - Use React.cache() for per-request deduplication
+- `server-cache-lru` - Use LRU cache for cross-request caching
+- `server-dedup-props` - Avoid duplicate serialization in RSC props
+- `server-serialization` - Minimize data passed to client components
+- `server-parallel-fetching` - Restructure components to parallelize fetches
+- `server-after-nonblocking` - Use after() for non-blocking operations
+
+### 4. Client-Side Data Fetching (MEDIUM-HIGH)
+
+- `client-swr-dedup` - Use SWR for automatic request deduplication
+- `client-event-listeners` - Deduplicate global event listeners
+- `client-passive-event-listeners` - Use passive listeners for scroll
+- `client-localstorage-schema` - Version and minimize localStorage data
+
+### 5. Re-render Optimization (MEDIUM)
+
+- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
+- `rerender-memo` - Extract expensive work into memoized components
+- `rerender-memo-with-default-value` - Hoist default non-primitive props
+- `rerender-dependencies` - Use primitive dependencies in effects
+- `rerender-derived-state` - Subscribe to derived booleans, not raw values
+- `rerender-derived-state-no-effect` - Derive state during render, not effects
+- `rerender-functional-setstate` - Use functional setState for stable callbacks
+- `rerender-lazy-state-init` - Pass function to useState for expensive values
+- `rerender-simple-expression-in-memo` - Avoid memo for simple primitives
+- `rerender-move-effect-to-event` - Put interaction logic in event handlers
+- `rerender-transitions` - Use startTransition for non-urgent updates
+- `rerender-use-ref-transient-values` - Use refs for transient frequent values
+
+### 6. Rendering Performance (MEDIUM)
+
+- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
+- `rendering-content-visibility` - Use content-visibility for long lists
+- `rendering-hoist-jsx` - Extract static JSX outside components
+- `rendering-svg-precision` - Reduce SVG coordinate precision
+- `rendering-hydration-no-flicker` - Use inline script for client-only data
+- `rendering-hydration-suppress-warning` - Suppress expected mismatches
+- `rendering-activity` - Use Activity component for show/hide
+- `rendering-conditional-render` - Use ternary, not && for conditionals
+- `rendering-usetransition-loading` - Prefer useTransition for loading state
+
+### 7. JavaScript Performance (LOW-MEDIUM)
+
+- `js-batch-dom-css` - Group CSS changes via classes or cssText
+- `js-index-maps` - Build Map for repeated lookups
+- `js-cache-property-access` - Cache object properties in loops
+- `js-cache-function-results` - Cache function results in module-level Map
+- `js-cache-storage` - Cache localStorage/sessionStorage reads
+- `js-combine-iterations` - Combine multiple filter/map into one loop
+- `js-length-check-first` - Check array length before expensive comparison
+- `js-early-exit` - Return early from functions
+- `js-hoist-regexp` - Hoist RegExp creation outside loops
+- `js-min-max-loop` - Use loop for min/max instead of sort
+- `js-set-map-lookups` - Use Set/Map for O(1) lookups
+- `js-tosorted-immutable` - Use toSorted() for immutability
+
+### 8. Advanced Patterns (LOW)
+
+- `advanced-event-handler-refs` - Store event handlers in refs
+- `advanced-init-once` - Initialize app once per app load
+- `advanced-use-latest` - useLatest for stable callback refs
+
+## How to Use
+
+Read individual rule files for detailed explanations and code examples:
+
+```
+rules/async-parallel.md
+rules/bundle-barrel-imports.md
+```
+
+Each rule file contains:
+- Brief explanation of why it matters
+- Incorrect code example with explanation
+- Correct code example with explanation
+- Additional context and references
+
+## Full Compiled Document
+
+For the complete guide with all rules expanded: `AGENTS.md`
diff --git a/.agents/skills/vercel-react-best-practices/rules/advanced-event-handler-refs.md b/.agents/skills/vercel-react-best-practices/rules/advanced-event-handler-refs.md
new file mode 100644
index 000000000000..97e7ade243aa
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/advanced-event-handler-refs.md
@@ -0,0 +1,55 @@
+---
+title: Store Event Handlers in Refs
+impact: LOW
+impactDescription: stable subscriptions
+tags: advanced, hooks, refs, event-handlers, optimization
+---
+
+## Store Event Handlers in Refs
+
+Store callbacks in refs when used in effects that shouldn't re-subscribe on callback changes.
+
+**Incorrect (re-subscribes on every render):**
+
+```tsx
+function useWindowEvent(event: string, handler: (e) => void) {
+ useEffect(() => {
+ window.addEventListener(event, handler)
+ return () => window.removeEventListener(event, handler)
+ }, [event, handler])
+}
+```
+
+**Correct (stable subscription):**
+
+```tsx
+function useWindowEvent(event: string, handler: (e) => void) {
+ const handlerRef = useRef(handler)
+ useEffect(() => {
+ handlerRef.current = handler
+ }, [handler])
+
+ useEffect(() => {
+ const listener = (e) => handlerRef.current(e)
+ window.addEventListener(event, listener)
+ return () => window.removeEventListener(event, listener)
+ }, [event])
+}
+```
+
+**Alternative: use `useEffectEvent` if you're on latest React:**
+
+```tsx
+import { useEffectEvent } from 'react'
+
+function useWindowEvent(event: string, handler: (e) => void) {
+ const onEvent = useEffectEvent(handler)
+
+ useEffect(() => {
+ window.addEventListener(event, onEvent)
+ return () => window.removeEventListener(event, onEvent)
+ }, [event])
+}
+```
+
+`useEffectEvent` provides a cleaner API for the same pattern: it creates a stable function reference that always calls the latest version of the handler.
diff --git a/.agents/skills/vercel-react-best-practices/rules/advanced-init-once.md b/.agents/skills/vercel-react-best-practices/rules/advanced-init-once.md
new file mode 100644
index 000000000000..73ee38e5e74c
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/advanced-init-once.md
@@ -0,0 +1,42 @@
+---
+title: Initialize App Once, Not Per Mount
+impact: LOW-MEDIUM
+impactDescription: avoids duplicate init in development
+tags: initialization, useEffect, app-startup, side-effects
+---
+
+## Initialize App Once, Not Per Mount
+
+Do not put app-wide initialization that must run once per app load inside `useEffect([])` of a component. Components can remount and effects will re-run. Use a module-level guard or top-level init in the entry module instead.
+
+**Incorrect (runs twice in dev, re-runs on remount):**
+
+```tsx
+function Comp() {
+ useEffect(() => {
+ loadFromStorage()
+ checkAuthToken()
+ }, [])
+
+ // ...
+}
+```
+
+**Correct (once per app load):**
+
+```tsx
+let didInit = false
+
+function Comp() {
+ useEffect(() => {
+ if (didInit) return
+ didInit = true
+ loadFromStorage()
+ checkAuthToken()
+ }, [])
+
+ // ...
+}
+```
+
+Reference: [Initializing the application](https://react.dev/learn/you-might-not-need-an-effect#initializing-the-application)
diff --git a/.agents/skills/vercel-react-best-practices/rules/advanced-use-latest.md b/.agents/skills/vercel-react-best-practices/rules/advanced-use-latest.md
new file mode 100644
index 000000000000..9c7cb501693d
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/advanced-use-latest.md
@@ -0,0 +1,39 @@
+---
+title: useEffectEvent for Stable Callback Refs
+impact: LOW
+impactDescription: prevents effect re-runs
+tags: advanced, hooks, useEffectEvent, refs, optimization
+---
+
+## useEffectEvent for Stable Callback Refs
+
+Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
+
+**Incorrect (effect re-runs on every callback change):**
+
+```tsx
+function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
+ const [query, setQuery] = useState('')
+
+ useEffect(() => {
+ const timeout = setTimeout(() => onSearch(query), 300)
+ return () => clearTimeout(timeout)
+ }, [query, onSearch])
+}
+```
+
+**Correct (using React's useEffectEvent):**
+
+```tsx
+import { useEffectEvent } from 'react';
+
+function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
+ const [query, setQuery] = useState('')
+ const onSearchEvent = useEffectEvent(onSearch)
+
+ useEffect(() => {
+ const timeout = setTimeout(() => onSearchEvent(query), 300)
+ return () => clearTimeout(timeout)
+ }, [query])
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/async-api-routes.md b/.agents/skills/vercel-react-best-practices/rules/async-api-routes.md
new file mode 100644
index 000000000000..6feda1ef0ac0
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/async-api-routes.md
@@ -0,0 +1,38 @@
+---
+title: Prevent Waterfall Chains in API Routes
+impact: CRITICAL
+impactDescription: 2-10× improvement
+tags: api-routes, server-actions, waterfalls, parallelization
+---
+
+## Prevent Waterfall Chains in API Routes
+
+In API routes and Server Actions, start independent operations immediately, even if you don't await them yet.
+
+**Incorrect (config waits for auth, data waits for both):**
+
+```typescript
+export async function GET(request: Request) {
+ const session = await auth()
+ const config = await fetchConfig()
+ const data = await fetchData(session.user.id)
+ return Response.json({ data, config })
+}
+```
+
+**Correct (auth and config start immediately):**
+
+```typescript
+export async function GET(request: Request) {
+ const sessionPromise = auth()
+ const configPromise = fetchConfig()
+ const session = await sessionPromise
+ const [config, data] = await Promise.all([
+ configPromise,
+ fetchData(session.user.id)
+ ])
+ return Response.json({ data, config })
+}
+```
+
+For operations with more complex dependency chains, use `better-all` to automatically maximize parallelism (see Dependency-Based Parallelization).
diff --git a/.agents/skills/vercel-react-best-practices/rules/async-defer-await.md b/.agents/skills/vercel-react-best-practices/rules/async-defer-await.md
new file mode 100644
index 000000000000..ea7082a3623e
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/async-defer-await.md
@@ -0,0 +1,80 @@
+---
+title: Defer Await Until Needed
+impact: HIGH
+impactDescription: avoids blocking unused code paths
+tags: async, await, conditional, optimization
+---
+
+## Defer Await Until Needed
+
+Move `await` operations into the branches where they're actually used to avoid blocking code paths that don't need them.
+
+**Incorrect (blocks both branches):**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+ const userData = await fetchUserData(userId)
+
+ if (skipProcessing) {
+ // Returns immediately but still waited for userData
+ return { skipped: true }
+ }
+
+ // Only this branch uses userData
+ return processUserData(userData)
+}
+```
+
+**Correct (only blocks when needed):**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+ if (skipProcessing) {
+ // Returns immediately without waiting
+ return { skipped: true }
+ }
+
+ // Fetch only when needed
+ const userData = await fetchUserData(userId)
+ return processUserData(userData)
+}
+```
+
+**Another example (early return optimization):**
+
+```typescript
+// Incorrect: always fetches permissions
+async function updateResource(resourceId: string, userId: string) {
+ const permissions = await fetchPermissions(userId)
+ const resource = await getResource(resourceId)
+
+ if (!resource) {
+ return { error: 'Not found' }
+ }
+
+ if (!permissions.canEdit) {
+ return { error: 'Forbidden' }
+ }
+
+ return await updateResourceData(resource, permissions)
+}
+
+// Correct: fetches only when needed
+async function updateResource(resourceId: string, userId: string) {
+ const resource = await getResource(resourceId)
+
+ if (!resource) {
+ return { error: 'Not found' }
+ }
+
+ const permissions = await fetchPermissions(userId)
+
+ if (!permissions.canEdit) {
+ return { error: 'Forbidden' }
+ }
+
+ return await updateResourceData(resource, permissions)
+}
+```
+
+This optimization is especially valuable when the skipped branch is frequently taken, or when the deferred operation is expensive.
diff --git a/.agents/skills/vercel-react-best-practices/rules/async-dependencies.md b/.agents/skills/vercel-react-best-practices/rules/async-dependencies.md
new file mode 100644
index 000000000000..0484ebab993f
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/async-dependencies.md
@@ -0,0 +1,51 @@
+---
+title: Dependency-Based Parallelization
+impact: CRITICAL
+impactDescription: 2-10× improvement
+tags: async, parallelization, dependencies, better-all
+---
+
+## Dependency-Based Parallelization
+
+For operations with partial dependencies, use `better-all` to maximize parallelism. It automatically starts each task at the earliest possible moment.
+
+**Incorrect (profile waits for config unnecessarily):**
+
+```typescript
+const [user, config] = await Promise.all([
+ fetchUser(),
+ fetchConfig()
+])
+const profile = await fetchProfile(user.id)
+```
+
+**Correct (config and profile run in parallel):**
+
+```typescript
+import { all } from 'better-all'
+
+const { user, config, profile } = await all({
+ async user() { return fetchUser() },
+ async config() { return fetchConfig() },
+ async profile() {
+ return fetchProfile((await this.$.user).id)
+ }
+})
+```
+
+**Alternative without extra dependencies:**
+
+We can also create all the promises first, and do `Promise.all()` at the end.
+
+```typescript
+const userPromise = fetchUser()
+const profilePromise = userPromise.then(user => fetchProfile(user.id))
+
+const [user, config, profile] = await Promise.all([
+ userPromise,
+ fetchConfig(),
+ profilePromise
+])
+```
+
+Reference: [https://github.com/shuding/better-all](https://github.com/shuding/better-all)
diff --git a/.agents/skills/vercel-react-best-practices/rules/async-parallel.md b/.agents/skills/vercel-react-best-practices/rules/async-parallel.md
new file mode 100644
index 000000000000..64133f6c31fe
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/async-parallel.md
@@ -0,0 +1,28 @@
+---
+title: Promise.all() for Independent Operations
+impact: CRITICAL
+impactDescription: 2-10× improvement
+tags: async, parallelization, promises, waterfalls
+---
+
+## Promise.all() for Independent Operations
+
+When async operations have no interdependencies, execute them concurrently using `Promise.all()`.
+
+**Incorrect (sequential execution, 3 round trips):**
+
+```typescript
+const user = await fetchUser()
+const posts = await fetchPosts()
+const comments = await fetchComments()
+```
+
+**Correct (parallel execution, 1 round trip):**
+
+```typescript
+const [user, posts, comments] = await Promise.all([
+ fetchUser(),
+ fetchPosts(),
+ fetchComments()
+])
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/async-suspense-boundaries.md b/.agents/skills/vercel-react-best-practices/rules/async-suspense-boundaries.md
new file mode 100644
index 000000000000..1fbc05b04ed2
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/async-suspense-boundaries.md
@@ -0,0 +1,99 @@
+---
+title: Strategic Suspense Boundaries
+impact: HIGH
+impactDescription: faster initial paint
+tags: async, suspense, streaming, layout-shift
+---
+
+## Strategic Suspense Boundaries
+
+Instead of awaiting data in async components before returning JSX, use Suspense boundaries to show the wrapper UI faster while data loads.
+
+**Incorrect (wrapper blocked by data fetching):**
+
+```tsx
+async function Page() {
+ const data = await fetchData() // Blocks entire page
+
+ return (
+
+
Sidebar
+
Header
+
+
+
+
Footer
+
+ )
+}
+```
+
+The entire layout waits for data even though only the middle section needs it.
+
+**Correct (wrapper shows immediately, data streams in):**
+
+```tsx
+function Page() {
+ return (
+
+
Sidebar
+
Header
+
+ }>
+
+
+
+
Footer
+
+ )
+}
+
+async function DataDisplay() {
+ const data = await fetchData() // Only blocks this component
+ return
{data.content}
+}
+```
+
+Sidebar, Header, and Footer render immediately. Only DataDisplay waits for data.
+
+**Alternative (share promise across components):**
+
+```tsx
+function Page() {
+ // Start fetch immediately, but don't await
+ const dataPromise = fetchData()
+
+ return (
+
+ )
+}
+```
+
+Prefer CSS classes over inline styles when possible. CSS files are cached by the browser, and classes provide better separation of concerns and are easier to maintain.
+
+See [this gist](https://gist.github.com/paulirish/5d52fb081b3570c81e3a) and [CSS Triggers](https://csstriggers.com/) for more information on layout-forcing operations.
diff --git a/.agents/skills/vercel-react-best-practices/rules/js-cache-function-results.md b/.agents/skills/vercel-react-best-practices/rules/js-cache-function-results.md
new file mode 100644
index 000000000000..180f8ac8fffd
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/js-cache-function-results.md
@@ -0,0 +1,80 @@
+---
+title: Cache Repeated Function Calls
+impact: MEDIUM
+impactDescription: avoid redundant computation
+tags: javascript, cache, memoization, performance
+---
+
+## Cache Repeated Function Calls
+
+Use a module-level Map to cache function results when the same function is called repeatedly with the same inputs during render.
+
+**Incorrect (redundant computation):**
+
+```typescript
+function ProjectList({ projects }: { projects: Project[] }) {
+ return (
+
+ {projects.map(project => {
+ // slugify() called 100+ times for same project names
+ const slug = slugify(project.name)
+
+ return
+ })}
+
+ )
+}
+```
+
+This applies to all CSS transforms and transitions (`transform`, `opacity`, `translate`, `scale`, `rotate`). The wrapper div allows browsers to use GPU acceleration for smoother animations.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rendering-conditional-render.md b/.agents/skills/vercel-react-best-practices/rules/rendering-conditional-render.md
new file mode 100644
index 000000000000..7e866f5852da
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rendering-conditional-render.md
@@ -0,0 +1,40 @@
+---
+title: Use Explicit Conditional Rendering
+impact: LOW
+impactDescription: prevents rendering 0 or NaN
+tags: rendering, conditional, jsx, falsy-values
+---
+
+## Use Explicit Conditional Rendering
+
+Use explicit ternary operators (`? :`) instead of `&&` for conditional rendering when the condition can be `0`, `NaN`, or other falsy values that render.
+
+**Incorrect (renders "0" when count is 0):**
+
+```tsx
+function Badge({ count }: { count: number }) {
+ return (
+
+ {count && {count}}
+
+ )
+}
+
+// When count = 0, renders:
0
+// When count = 5, renders:
5
+```
+
+**Correct (renders nothing when count is 0):**
+
+```tsx
+function Badge({ count }: { count: number }) {
+ return (
+
+ {count > 0 ? {count} : null}
+
+ )
+}
+
+// When count = 0, renders:
+// When count = 5, renders:
+ )
+}
+```
+
+This is especially helpful for large and static SVG nodes, which can be expensive to recreate on every render.
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler automatically hoists static JSX elements and optimizes component re-renders, making manual hoisting unnecessary.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-no-flicker.md b/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-no-flicker.md
new file mode 100644
index 000000000000..5cf0e79b69af
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-no-flicker.md
@@ -0,0 +1,82 @@
+---
+title: Prevent Hydration Mismatch Without Flickering
+impact: MEDIUM
+impactDescription: avoids visual flicker and hydration errors
+tags: rendering, ssr, hydration, localStorage, flicker
+---
+
+## Prevent Hydration Mismatch Without Flickering
+
+When rendering content that depends on client-side storage (localStorage, cookies), avoid both SSR breakage and post-hydration flickering by injecting a synchronous script that updates the DOM before React hydrates.
+
+**Incorrect (breaks SSR):**
+
+```tsx
+function ThemeWrapper({ children }: { children: ReactNode }) {
+ // localStorage is not available on server - throws error
+ const theme = localStorage.getItem('theme') || 'light'
+
+ return (
+
+ )
+}
+```
+
+Component first renders with default value (`light`), then updates after hydration, causing a visible flash of incorrect content.
+
+**Correct (no flicker, no hydration mismatch):**
+
+```tsx
+function ThemeWrapper({ children }: { children: ReactNode }) {
+ return (
+ <>
+
+ {children}
+
+
+
+ )
+}
+```
+
+The inline script executes synchronously before showing the element, ensuring the DOM already has the correct value. No flickering, no hydration mismatch.
+
+This pattern is especially useful for theme toggles, user preferences, authentication states, and any client-only data that should render immediately without flashing default values.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-suppress-warning.md b/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-suppress-warning.md
new file mode 100644
index 000000000000..24ba2513a29f
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rendering-hydration-suppress-warning.md
@@ -0,0 +1,30 @@
+---
+title: Suppress Expected Hydration Mismatches
+impact: LOW-MEDIUM
+impactDescription: avoids noisy hydration warnings for known differences
+tags: rendering, hydration, ssr, nextjs
+---
+
+## Suppress Expected Hydration Mismatches
+
+In SSR frameworks (e.g., Next.js), some values are intentionally different on server vs client (random IDs, dates, locale/timezone formatting). For these *expected* mismatches, wrap the dynamic text in an element with `suppressHydrationWarning` to prevent noisy warnings. Do not use this to hide real bugs. Don’t overuse it.
+
+**Incorrect (known mismatch warnings):**
+
+```tsx
+function Timestamp() {
+ return {new Date().toLocaleString()}
+}
+```
+
+**Correct (suppress expected mismatch only):**
+
+```tsx
+function Timestamp() {
+ return (
+
+ {new Date().toLocaleString()}
+
+ )
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rendering-svg-precision.md b/.agents/skills/vercel-react-best-practices/rules/rendering-svg-precision.md
new file mode 100644
index 000000000000..6d7712860365
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rendering-svg-precision.md
@@ -0,0 +1,28 @@
+---
+title: Optimize SVG Precision
+impact: LOW
+impactDescription: reduces file size
+tags: rendering, svg, optimization, svgo
+---
+
+## Optimize SVG Precision
+
+Reduce SVG coordinate precision to decrease file size. The optimal precision depends on the viewBox size, but in general reducing precision should be considered.
+
+**Incorrect (excessive precision):**
+
+```svg
+
+```
+
+**Correct (1 decimal place):**
+
+```svg
+
+```
+
+**Automate with SVGO:**
+
+```bash
+npx svgo --precision=1 --multipass icon.svg
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rendering-usetransition-loading.md b/.agents/skills/vercel-react-best-practices/rules/rendering-usetransition-loading.md
new file mode 100644
index 000000000000..0c1b0b98e884
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rendering-usetransition-loading.md
@@ -0,0 +1,75 @@
+---
+title: Use useTransition Over Manual Loading States
+impact: LOW
+impactDescription: reduces re-renders and improves code clarity
+tags: rendering, transitions, useTransition, loading, state
+---
+
+## Use useTransition Over Manual Loading States
+
+Use `useTransition` instead of manual `useState` for loading states. This provides built-in `isPending` state and automatically manages transitions.
+
+**Incorrect (manual loading state):**
+
+```tsx
+function SearchResults() {
+ const [query, setQuery] = useState('')
+ const [results, setResults] = useState([])
+ const [isLoading, setIsLoading] = useState(false)
+
+ const handleSearch = async (value: string) => {
+ setIsLoading(true)
+ setQuery(value)
+ const data = await fetchResults(value)
+ setResults(data)
+ setIsLoading(false)
+ }
+
+ return (
+ <>
+ handleSearch(e.target.value)} />
+ {isLoading && }
+
+
+ )
+}
+```
+
+**Correct (useTransition with built-in pending state):**
+
+```tsx
+import { useTransition, useState } from 'react'
+
+function SearchResults() {
+ const [query, setQuery] = useState('')
+ const [results, setResults] = useState([])
+ const [isPending, startTransition] = useTransition()
+
+ const handleSearch = (value: string) => {
+ setQuery(value) // Update input immediately
+
+ startTransition(async () => {
+ // Fetch and update results
+ const data = await fetchResults(value)
+ setResults(data)
+ })
+ }
+
+ return (
+ <>
+ handleSearch(e.target.value)} />
+ {isPending && }
+
+
+ )
+}
+```
+
+**Benefits:**
+
+- **Automatic pending state**: No need to manually manage `setIsLoading(true/false)`
+- **Error resilience**: Pending state correctly resets even if the transition throws
+- **Better responsiveness**: Keeps the UI responsive during updates
+- **Interrupt handling**: New transitions automatically cancel pending ones
+
+Reference: [useTransition](https://react.dev/reference/react/useTransition)
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-defer-reads.md b/.agents/skills/vercel-react-best-practices/rules/rerender-defer-reads.md
new file mode 100644
index 000000000000..e867c95f02fe
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-defer-reads.md
@@ -0,0 +1,39 @@
+---
+title: Defer State Reads to Usage Point
+impact: MEDIUM
+impactDescription: avoids unnecessary subscriptions
+tags: rerender, searchParams, localStorage, optimization
+---
+
+## Defer State Reads to Usage Point
+
+Don't subscribe to dynamic state (searchParams, localStorage) if you only read it inside callbacks.
+
+**Incorrect (subscribes to all searchParams changes):**
+
+```tsx
+function ShareButton({ chatId }: { chatId: string }) {
+ const searchParams = useSearchParams()
+
+ const handleShare = () => {
+ const ref = searchParams.get('ref')
+ shareChat(chatId, { ref })
+ }
+
+ return
+}
+```
+
+**Correct (reads on demand, no subscription):**
+
+```tsx
+function ShareButton({ chatId }: { chatId: string }) {
+ const handleShare = () => {
+ const params = new URLSearchParams(window.location.search)
+ const ref = params.get('ref')
+ shareChat(chatId, { ref })
+ }
+
+ return
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-dependencies.md b/.agents/skills/vercel-react-best-practices/rules/rerender-dependencies.md
new file mode 100644
index 000000000000..47a4d9268570
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-dependencies.md
@@ -0,0 +1,45 @@
+---
+title: Narrow Effect Dependencies
+impact: LOW
+impactDescription: minimizes effect re-runs
+tags: rerender, useEffect, dependencies, optimization
+---
+
+## Narrow Effect Dependencies
+
+Specify primitive dependencies instead of objects to minimize effect re-runs.
+
+**Incorrect (re-runs on any user field change):**
+
+```tsx
+useEffect(() => {
+ console.log(user.id)
+}, [user])
+```
+
+**Correct (re-runs only when id changes):**
+
+```tsx
+useEffect(() => {
+ console.log(user.id)
+}, [user.id])
+```
+
+**For derived state, compute outside effect:**
+
+```tsx
+// Incorrect: runs on width=767, 766, 765...
+useEffect(() => {
+ if (width < 768) {
+ enableMobileMode()
+ }
+}, [width])
+
+// Correct: runs only on boolean transition
+const isMobile = width < 768
+useEffect(() => {
+ if (isMobile) {
+ enableMobileMode()
+ }
+}, [isMobile])
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state-no-effect.md b/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state-no-effect.md
new file mode 100644
index 000000000000..3d9fe4050794
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state-no-effect.md
@@ -0,0 +1,40 @@
+---
+title: Calculate Derived State During Rendering
+impact: MEDIUM
+impactDescription: avoids redundant renders and state drift
+tags: rerender, derived-state, useEffect, state
+---
+
+## Calculate Derived State During Rendering
+
+If a value can be computed from current props/state, do not store it in state or update it in an effect. Derive it during render to avoid extra renders and state drift. Do not set state in effects solely in response to prop changes; prefer derived values or keyed resets instead.
+
+**Incorrect (redundant state and effect):**
+
+```tsx
+function Form() {
+ const [firstName, setFirstName] = useState('First')
+ const [lastName, setLastName] = useState('Last')
+ const [fullName, setFullName] = useState('')
+
+ useEffect(() => {
+ setFullName(firstName + ' ' + lastName)
+ }, [firstName, lastName])
+
+ return
+}
+```
+
+References: [You Might Not Need an Effect](https://react.dev/learn/you-might-not-need-an-effect)
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state.md b/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state.md
new file mode 100644
index 000000000000..e5c899f6c073
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-derived-state.md
@@ -0,0 +1,29 @@
+---
+title: Subscribe to Derived State
+impact: MEDIUM
+impactDescription: reduces re-render frequency
+tags: rerender, derived-state, media-query, optimization
+---
+
+## Subscribe to Derived State
+
+Subscribe to derived boolean state instead of continuous values to reduce re-render frequency.
+
+**Incorrect (re-renders on every pixel change):**
+
+```tsx
+function Sidebar() {
+ const width = useWindowWidth() // updates continuously
+ const isMobile = width < 768
+ return
+}
+```
+
+**Correct (re-renders only when boolean changes):**
+
+```tsx
+function Sidebar() {
+ const isMobile = useMediaQuery('(max-width: 767px)')
+ return
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-functional-setstate.md b/.agents/skills/vercel-react-best-practices/rules/rerender-functional-setstate.md
new file mode 100644
index 000000000000..b004ef45e347
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-functional-setstate.md
@@ -0,0 +1,74 @@
+---
+title: Use Functional setState Updates
+impact: MEDIUM
+impactDescription: prevents stale closures and unnecessary callback recreations
+tags: react, hooks, useState, useCallback, callbacks, closures
+---
+
+## Use Functional setState Updates
+
+When updating state based on the current state value, use the functional update form of setState instead of directly referencing the state variable. This prevents stale closures, eliminates unnecessary dependencies, and creates stable callback references.
+
+**Incorrect (requires state as dependency):**
+
+```tsx
+function TodoList() {
+ const [items, setItems] = useState(initialItems)
+
+ // Callback must depend on items, recreated on every items change
+ const addItems = useCallback((newItems: Item[]) => {
+ setItems([...items, ...newItems])
+ }, [items]) // ❌ items dependency causes recreations
+
+ // Risk of stale closure if dependency is forgotten
+ const removeItem = useCallback((id: string) => {
+ setItems(items.filter(item => item.id !== id))
+ }, []) // ❌ Missing items dependency - will use stale items!
+
+ return
+}
+```
+
+The first callback is recreated every time `items` changes, which can cause child components to re-render unnecessarily. The second callback has a stale closure bug—it will always reference the initial `items` value.
+
+**Correct (stable callbacks, no stale closures):**
+
+```tsx
+function TodoList() {
+ const [items, setItems] = useState(initialItems)
+
+ // Stable callback, never recreated
+ const addItems = useCallback((newItems: Item[]) => {
+ setItems(curr => [...curr, ...newItems])
+ }, []) // ✅ No dependencies needed
+
+ // Always uses latest state, no stale closure risk
+ const removeItem = useCallback((id: string) => {
+ setItems(curr => curr.filter(item => item.id !== id))
+ }, []) // ✅ Safe and stable
+
+ return
+}
+```
+
+**Benefits:**
+
+1. **Stable callback references** - Callbacks don't need to be recreated when state changes
+2. **No stale closures** - Always operates on the latest state value
+3. **Fewer dependencies** - Simplifies dependency arrays and reduces memory leaks
+4. **Prevents bugs** - Eliminates the most common source of React closure bugs
+
+**When to use functional updates:**
+
+- Any setState that depends on the current state value
+- Inside useCallback/useMemo when state is needed
+- Event handlers that reference state
+- Async operations that update state
+
+**When direct updates are fine:**
+
+- Setting state to a static value: `setCount(0)`
+- Setting state from props/arguments only: `setName(newName)`
+- State doesn't depend on previous value
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler can automatically optimize some cases, but functional updates are still recommended for correctness and to prevent stale closure bugs.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-lazy-state-init.md b/.agents/skills/vercel-react-best-practices/rules/rerender-lazy-state-init.md
new file mode 100644
index 000000000000..4ecb350fbadf
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-lazy-state-init.md
@@ -0,0 +1,58 @@
+---
+title: Use Lazy State Initialization
+impact: MEDIUM
+impactDescription: wasted computation on every render
+tags: react, hooks, useState, performance, initialization
+---
+
+## Use Lazy State Initialization
+
+Pass a function to `useState` for expensive initial values. Without the function form, the initializer runs on every render even though the value is only used once.
+
+**Incorrect (runs on every render):**
+
+```tsx
+function FilteredList({ items }: { items: Item[] }) {
+ // buildSearchIndex() runs on EVERY render, even after initialization
+ const [searchIndex, setSearchIndex] = useState(buildSearchIndex(items))
+ const [query, setQuery] = useState('')
+
+ // When query changes, buildSearchIndex runs again unnecessarily
+ return
+}
+
+function UserProfile() {
+ // JSON.parse runs on every render
+ const [settings, setSettings] = useState(
+ JSON.parse(localStorage.getItem('settings') || '{}')
+ )
+
+ return
+}
+```
+
+**Correct (runs only once):**
+
+```tsx
+function FilteredList({ items }: { items: Item[] }) {
+ // buildSearchIndex() runs ONLY on initial render
+ const [searchIndex, setSearchIndex] = useState(() => buildSearchIndex(items))
+ const [query, setQuery] = useState('')
+
+ return
+}
+
+function UserProfile() {
+ // JSON.parse runs only on initial render
+ const [settings, setSettings] = useState(() => {
+ const stored = localStorage.getItem('settings')
+ return stored ? JSON.parse(stored) : {}
+ })
+
+ return
+}
+```
+
+Use lazy initialization when computing initial values from localStorage/sessionStorage, building data structures (indexes, maps), reading from the DOM, or performing heavy transformations.
+
+For simple primitives (`useState(0)`), direct references (`useState(props.value)`), or cheap literals (`useState({})`), the function form is unnecessary.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-memo-with-default-value.md b/.agents/skills/vercel-react-best-practices/rules/rerender-memo-with-default-value.md
new file mode 100644
index 000000000000..63570491848c
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-memo-with-default-value.md
@@ -0,0 +1,38 @@
+---
+
+title: Extract Default Non-primitive Parameter Value from Memoized Component to Constant
+impact: MEDIUM
+impactDescription: restores memoization by using a constant for default value
+tags: rerender, memo, optimization
+
+---
+
+## Extract Default Non-primitive Parameter Value from Memoized Component to Constant
+
+When memoized component has a default value for some non-primitive optional parameter, such as an array, function, or object, calling the component without that parameter results in broken memoization. This is because new value instances are created on every rerender, and they do not pass strict equality comparison in `memo()`.
+
+To address this issue, extract the default value into a constant.
+
+**Incorrect (`onClick` has different values on every rerender):**
+
+```tsx
+const UserAvatar = memo(function UserAvatar({ onClick = () => {} }: { onClick?: () => void }) {
+ // ...
+})
+
+// Used without optional onClick
+
+```
+
+**Correct (stable default value):**
+
+```tsx
+const NOOP = () => {};
+
+const UserAvatar = memo(function UserAvatar({ onClick = NOOP }: { onClick?: () => void }) {
+ // ...
+})
+
+// Used without optional onClick
+
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-memo.md b/.agents/skills/vercel-react-best-practices/rules/rerender-memo.md
new file mode 100644
index 000000000000..f8982ab61210
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-memo.md
@@ -0,0 +1,44 @@
+---
+title: Extract to Memoized Components
+impact: MEDIUM
+impactDescription: enables early returns
+tags: rerender, memo, useMemo, optimization
+---
+
+## Extract to Memoized Components
+
+Extract expensive work into memoized components to enable early returns before computation.
+
+**Incorrect (computes avatar even when loading):**
+
+```tsx
+function Profile({ user, loading }: Props) {
+ const avatar = useMemo(() => {
+ const id = computeAvatarId(user)
+ return
+ }, [user])
+
+ if (loading) return
+ return
{avatar}
+}
+```
+
+**Correct (skips computation when loading):**
+
+```tsx
+const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {
+ const id = useMemo(() => computeAvatarId(user), [user])
+ return
+})
+
+function Profile({ user, loading }: Props) {
+ if (loading) return
+ return (
+
+
+
+ )
+}
+```
+
+**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, manual memoization with `memo()` and `useMemo()` is not necessary. The compiler automatically optimizes re-renders.
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-move-effect-to-event.md b/.agents/skills/vercel-react-best-practices/rules/rerender-move-effect-to-event.md
new file mode 100644
index 000000000000..dd58a1af091b
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-move-effect-to-event.md
@@ -0,0 +1,45 @@
+---
+title: Put Interaction Logic in Event Handlers
+impact: MEDIUM
+impactDescription: avoids effect re-runs and duplicate side effects
+tags: rerender, useEffect, events, side-effects, dependencies
+---
+
+## Put Interaction Logic in Event Handlers
+
+If a side effect is triggered by a specific user action (submit, click, drag), run it in that event handler. Do not model the action as state + effect; it makes effects re-run on unrelated changes and can duplicate the action.
+
+**Incorrect (event modeled as state + effect):**
+
+```tsx
+function Form() {
+ const [submitted, setSubmitted] = useState(false)
+ const theme = useContext(ThemeContext)
+
+ useEffect(() => {
+ if (submitted) {
+ post('/api/register')
+ showToast('Registered', theme)
+ }
+ }, [submitted, theme])
+
+ return
+}
+```
+
+**Correct (do it in the handler):**
+
+```tsx
+function Form() {
+ const theme = useContext(ThemeContext)
+
+ function handleSubmit() {
+ post('/api/register')
+ showToast('Registered', theme)
+ }
+
+ return
+}
+```
+
+Reference: [Should this code move to an event handler?](https://react.dev/learn/removing-effect-dependencies#should-this-code-move-to-an-event-handler)
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-simple-expression-in-memo.md b/.agents/skills/vercel-react-best-practices/rules/rerender-simple-expression-in-memo.md
new file mode 100644
index 000000000000..59dfab0f3b04
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-simple-expression-in-memo.md
@@ -0,0 +1,35 @@
+---
+title: Do not wrap a simple expression with a primitive result type in useMemo
+impact: LOW-MEDIUM
+impactDescription: wasted computation on every render
+tags: rerender, useMemo, optimization
+---
+
+## Do not wrap a simple expression with a primitive result type in useMemo
+
+When an expression is simple (few logical or arithmetical operators) and has a primitive result type (boolean, number, string), do not wrap it in `useMemo`.
+Calling `useMemo` and comparing hook dependencies may consume more resources than the expression itself.
+
+**Incorrect:**
+
+```tsx
+function Header({ user, notifications }: Props) {
+ const isLoading = useMemo(() => {
+ return user.isLoading || notifications.isLoading
+ }, [user.isLoading, notifications.isLoading])
+
+ if (isLoading) return
+ // return some markup
+}
+```
+
+**Correct:**
+
+```tsx
+function Header({ user, notifications }: Props) {
+ const isLoading = user.isLoading || notifications.isLoading
+
+ if (isLoading) return
+ // return some markup
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-transitions.md b/.agents/skills/vercel-react-best-practices/rules/rerender-transitions.md
new file mode 100644
index 000000000000..d99f43f76423
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-transitions.md
@@ -0,0 +1,40 @@
+---
+title: Use Transitions for Non-Urgent Updates
+impact: MEDIUM
+impactDescription: maintains UI responsiveness
+tags: rerender, transitions, startTransition, performance
+---
+
+## Use Transitions for Non-Urgent Updates
+
+Mark frequent, non-urgent state updates as transitions to maintain UI responsiveness.
+
+**Incorrect (blocks UI on every scroll):**
+
+```tsx
+function ScrollTracker() {
+ const [scrollY, setScrollY] = useState(0)
+ useEffect(() => {
+ const handler = () => setScrollY(window.scrollY)
+ window.addEventListener('scroll', handler, { passive: true })
+ return () => window.removeEventListener('scroll', handler)
+ }, [])
+}
+```
+
+**Correct (non-blocking updates):**
+
+```tsx
+import { startTransition } from 'react'
+
+function ScrollTracker() {
+ const [scrollY, setScrollY] = useState(0)
+ useEffect(() => {
+ const handler = () => {
+ startTransition(() => setScrollY(window.scrollY))
+ }
+ window.addEventListener('scroll', handler, { passive: true })
+ return () => window.removeEventListener('scroll', handler)
+ }, [])
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/rerender-use-ref-transient-values.md b/.agents/skills/vercel-react-best-practices/rules/rerender-use-ref-transient-values.md
new file mode 100644
index 000000000000..cf04b81f8a53
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/rerender-use-ref-transient-values.md
@@ -0,0 +1,73 @@
+---
+title: Use useRef for Transient Values
+impact: MEDIUM
+impactDescription: avoids unnecessary re-renders on frequent updates
+tags: rerender, useref, state, performance
+---
+
+## Use useRef for Transient Values
+
+When a value changes frequently and you don't want a re-render on every update (e.g., mouse trackers, intervals, transient flags), store it in `useRef` instead of `useState`. Keep component state for UI; use refs for temporary DOM-adjacent values. Updating a ref does not trigger a re-render.
+
+**Incorrect (renders every update):**
+
+```tsx
+function Tracker() {
+ const [lastX, setLastX] = useState(0)
+
+ useEffect(() => {
+ const onMove = (e: MouseEvent) => setLastX(e.clientX)
+ window.addEventListener('mousemove', onMove)
+ return () => window.removeEventListener('mousemove', onMove)
+ }, [])
+
+ return (
+
+ )
+}
+```
+
+**Correct (no re-render for tracking):**
+
+```tsx
+function Tracker() {
+ const lastXRef = useRef(0)
+ const dotRef = useRef(null)
+
+ useEffect(() => {
+ const onMove = (e: MouseEvent) => {
+ lastXRef.current = e.clientX
+ const node = dotRef.current
+ if (node) {
+ node.style.transform = `translateX(${e.clientX}px)`
+ }
+ }
+ window.addEventListener('mousemove', onMove)
+ return () => window.removeEventListener('mousemove', onMove)
+ }, [])
+
+ return (
+
+ )
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-after-nonblocking.md b/.agents/skills/vercel-react-best-practices/rules/server-after-nonblocking.md
new file mode 100644
index 000000000000..e8f5b260f5fc
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-after-nonblocking.md
@@ -0,0 +1,73 @@
+---
+title: Use after() for Non-Blocking Operations
+impact: MEDIUM
+impactDescription: faster response times
+tags: server, async, logging, analytics, side-effects
+---
+
+## Use after() for Non-Blocking Operations
+
+Use Next.js's `after()` to schedule work that should execute after a response is sent. This prevents logging, analytics, and other side effects from blocking the response.
+
+**Incorrect (blocks response):**
+
+```tsx
+import { logUserAction } from '@/app/utils'
+
+export async function POST(request: Request) {
+ // Perform mutation
+ await updateDatabase(request)
+
+ // Logging blocks the response
+ const userAgent = request.headers.get('user-agent') || 'unknown'
+ await logUserAction({ userAgent })
+
+ return new Response(JSON.stringify({ status: 'success' }), {
+ status: 200,
+ headers: { 'Content-Type': 'application/json' }
+ })
+}
+```
+
+**Correct (non-blocking):**
+
+```tsx
+import { after } from 'next/server'
+import { headers, cookies } from 'next/headers'
+import { logUserAction } from '@/app/utils'
+
+export async function POST(request: Request) {
+ // Perform mutation
+ await updateDatabase(request)
+
+ // Log after response is sent
+ after(async () => {
+ const userAgent = (await headers()).get('user-agent') || 'unknown'
+ const sessionCookie = (await cookies()).get('session-id')?.value || 'anonymous'
+
+ logUserAction({ sessionCookie, userAgent })
+ })
+
+ return new Response(JSON.stringify({ status: 'success' }), {
+ status: 200,
+ headers: { 'Content-Type': 'application/json' }
+ })
+}
+```
+
+The response is sent immediately while logging happens in the background.
+
+**Common use cases:**
+
+- Analytics tracking
+- Audit logging
+- Sending notifications
+- Cache invalidation
+- Cleanup tasks
+
+**Important notes:**
+
+- `after()` runs even if the response fails or redirects
+- Works in Server Actions, Route Handlers, and Server Components
+
+Reference: [https://nextjs.org/docs/app/api-reference/functions/after](https://nextjs.org/docs/app/api-reference/functions/after)
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-auth-actions.md b/.agents/skills/vercel-react-best-practices/rules/server-auth-actions.md
new file mode 100644
index 000000000000..ee82c0442bc6
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-auth-actions.md
@@ -0,0 +1,96 @@
+---
+title: Authenticate Server Actions Like API Routes
+impact: CRITICAL
+impactDescription: prevents unauthorized access to server mutations
+tags: server, server-actions, authentication, security, authorization
+---
+
+## Authenticate Server Actions Like API Routes
+
+**Impact: CRITICAL (prevents unauthorized access to server mutations)**
+
+Server Actions (functions with `"use server"`) are exposed as public endpoints, just like API routes. Always verify authentication and authorization **inside** each Server Action—do not rely solely on middleware, layout guards, or page-level checks, as Server Actions can be invoked directly.
+
+Next.js documentation explicitly states: "Treat Server Actions with the same security considerations as public-facing API endpoints, and verify if the user is allowed to perform a mutation."
+
+**Incorrect (no authentication check):**
+
+```typescript
+'use server'
+
+export async function deleteUser(userId: string) {
+ // Anyone can call this! No auth check
+ await db.user.delete({ where: { id: userId } })
+ return { success: true }
+}
+```
+
+**Correct (authentication inside the action):**
+
+```typescript
+'use server'
+
+import { verifySession } from '@/lib/auth'
+import { unauthorized } from '@/lib/errors'
+
+export async function deleteUser(userId: string) {
+ // Always check auth inside the action
+ const session = await verifySession()
+
+ if (!session) {
+ throw unauthorized('Must be logged in')
+ }
+
+ // Check authorization too
+ if (session.user.role !== 'admin' && session.user.id !== userId) {
+ throw unauthorized('Cannot delete other users')
+ }
+
+ await db.user.delete({ where: { id: userId } })
+ return { success: true }
+}
+```
+
+**With input validation:**
+
+```typescript
+'use server'
+
+import { verifySession } from '@/lib/auth'
+import { z } from 'zod'
+
+const updateProfileSchema = z.object({
+ userId: z.string().uuid(),
+ name: z.string().min(1).max(100),
+ email: z.string().email()
+})
+
+export async function updateProfile(data: unknown) {
+ // Validate input first
+ const validated = updateProfileSchema.parse(data)
+
+ // Then authenticate
+ const session = await verifySession()
+ if (!session) {
+ throw new Error('Unauthorized')
+ }
+
+ // Then authorize
+ if (session.user.id !== validated.userId) {
+ throw new Error('Can only update own profile')
+ }
+
+ // Finally perform the mutation
+ await db.user.update({
+ where: { id: validated.userId },
+ data: {
+ name: validated.name,
+ email: validated.email
+ }
+ })
+
+ return { success: true }
+}
+```
+
+Reference: [https://nextjs.org/docs/app/guides/authentication](https://nextjs.org/docs/app/guides/authentication)
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-cache-lru.md b/.agents/skills/vercel-react-best-practices/rules/server-cache-lru.md
new file mode 100644
index 000000000000..ef6938aa53c5
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-cache-lru.md
@@ -0,0 +1,41 @@
+---
+title: Cross-Request LRU Caching
+impact: HIGH
+impactDescription: caches across requests
+tags: server, cache, lru, cross-request
+---
+
+## Cross-Request LRU Caching
+
+`React.cache()` only works within one request. For data shared across sequential requests (user clicks button A then button B), use an LRU cache.
+
+**Implementation:**
+
+```typescript
+import { LRUCache } from 'lru-cache'
+
+const cache = new LRUCache({
+ max: 1000,
+ ttl: 5 * 60 * 1000 // 5 minutes
+})
+
+export async function getUser(id: string) {
+ const cached = cache.get(id)
+ if (cached) return cached
+
+ const user = await db.user.findUnique({ where: { id } })
+ cache.set(id, user)
+ return user
+}
+
+// Request 1: DB query, result cached
+// Request 2: cache hit, no DB query
+```
+
+Use when sequential user actions hit multiple endpoints needing the same data within seconds.
+
+**With Vercel's [Fluid Compute](https://vercel.com/docs/fluid-compute):** LRU caching is especially effective because multiple concurrent requests can share the same function instance and cache. This means the cache persists across requests without needing external storage like Redis.
+
+**In traditional serverless:** Each invocation runs in isolation, so consider Redis for cross-process caching.
+
+Reference: [https://github.com/isaacs/node-lru-cache](https://github.com/isaacs/node-lru-cache)
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-cache-react.md b/.agents/skills/vercel-react-best-practices/rules/server-cache-react.md
new file mode 100644
index 000000000000..87c9ca33168a
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-cache-react.md
@@ -0,0 +1,76 @@
+---
+title: Per-Request Deduplication with React.cache()
+impact: MEDIUM
+impactDescription: deduplicates within request
+tags: server, cache, react-cache, deduplication
+---
+
+## Per-Request Deduplication with React.cache()
+
+Use `React.cache()` for server-side request deduplication. Authentication and database queries benefit most.
+
+**Usage:**
+
+```typescript
+import { cache } from 'react'
+
+export const getCurrentUser = cache(async () => {
+ const session = await auth()
+ if (!session?.user?.id) return null
+ return await db.user.findUnique({
+ where: { id: session.user.id }
+ })
+})
+```
+
+Within a single request, multiple calls to `getCurrentUser()` execute the query only once.
+
+**Avoid inline objects as arguments:**
+
+`React.cache()` uses shallow equality (`Object.is`) to determine cache hits. Inline objects create new references each call, preventing cache hits.
+
+**Incorrect (always cache miss):**
+
+```typescript
+const getUser = cache(async (params: { uid: number }) => {
+ return await db.user.findUnique({ where: { id: params.uid } })
+})
+
+// Each call creates new object, never hits cache
+getUser({ uid: 1 })
+getUser({ uid: 1 }) // Cache miss, runs query again
+```
+
+**Correct (cache hit):**
+
+```typescript
+const getUser = cache(async (uid: number) => {
+ return await db.user.findUnique({ where: { id: uid } })
+})
+
+// Primitive args use value equality
+getUser(1)
+getUser(1) // Cache hit, returns cached result
+```
+
+If you must pass objects, pass the same reference:
+
+```typescript
+const params = { uid: 1 }
+getUser(params) // Query runs
+getUser(params) // Cache hit (same reference)
+```
+
+**Next.js-Specific Note:**
+
+In Next.js, the `fetch` API is automatically extended with request memoization. Requests with the same URL and options are automatically deduplicated within a single request, so you don't need `React.cache()` for `fetch` calls. However, `React.cache()` is still essential for other async tasks:
+
+- Database queries (Prisma, Drizzle, etc.)
+- Heavy computations
+- Authentication checks
+- File system operations
+- Any non-fetch async work
+
+Use `React.cache()` to deduplicate these operations across your component tree.
+
+Reference: [React.cache documentation](https://react.dev/reference/react/cache)
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-dedup-props.md b/.agents/skills/vercel-react-best-practices/rules/server-dedup-props.md
new file mode 100644
index 000000000000..fb24a2562c73
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-dedup-props.md
@@ -0,0 +1,65 @@
+---
+title: Avoid Duplicate Serialization in RSC Props
+impact: LOW
+impactDescription: reduces network payload by avoiding duplicate serialization
+tags: server, rsc, serialization, props, client-components
+---
+
+## Avoid Duplicate Serialization in RSC Props
+
+**Impact: LOW (reduces network payload by avoiding duplicate serialization)**
+
+RSC→client serialization deduplicates by object reference, not value. Same reference = serialized once; new reference = serialized again. Do transformations (`.toSorted()`, `.filter()`, `.map()`) in client, not server.
+
+**Incorrect (duplicates array):**
+
+```tsx
+// RSC: sends 6 strings (2 arrays × 3 items)
+
+```
+
+**Correct (sends 3 strings):**
+
+```tsx
+// RSC: send once
+
+
+// Client: transform there
+'use client'
+const sorted = useMemo(() => [...usernames].sort(), [usernames])
+```
+
+**Nested deduplication behavior:**
+
+Deduplication works recursively. Impact varies by data type:
+
+- `string[]`, `number[]`, `boolean[]`: **HIGH impact** - array + all primitives fully duplicated
+- `object[]`: **LOW impact** - array duplicated, but nested objects deduplicated by reference
+
+```tsx
+// string[] - duplicates everything
+usernames={['a','b']} sorted={usernames.toSorted()} // sends 4 strings
+
+// object[] - duplicates array structure only
+users={[{id:1},{id:2}]} sorted={users.toSorted()} // sends 2 arrays + 2 unique objects (not 4)
+```
+
+**Operations breaking deduplication (create new references):**
+
+- Arrays: `.toSorted()`, `.filter()`, `.map()`, `.slice()`, `[...arr]`
+- Objects: `{...obj}`, `Object.assign()`, `structuredClone()`, `JSON.parse(JSON.stringify())`
+
+**More examples:**
+
+```tsx
+// ❌ Bad
+ u.active)} />
+
+
+// ✅ Good
+
+
+// Do filtering/destructuring in client
+```
+
+**Exception:** Pass derived data when transformation is expensive or client doesn't need original.
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-parallel-fetching.md b/.agents/skills/vercel-react-best-practices/rules/server-parallel-fetching.md
new file mode 100644
index 000000000000..1affc835a601
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-parallel-fetching.md
@@ -0,0 +1,83 @@
+---
+title: Parallel Data Fetching with Component Composition
+impact: CRITICAL
+impactDescription: eliminates server-side waterfalls
+tags: server, rsc, parallel-fetching, composition
+---
+
+## Parallel Data Fetching with Component Composition
+
+React Server Components execute sequentially within a tree. Restructure with composition to parallelize data fetching.
+
+**Incorrect (Sidebar waits for Page's fetch to complete):**
+
+```tsx
+export default async function Page() {
+ const header = await fetchHeader()
+ return (
+
+ )
+}
+
+export default function Page() {
+ return (
+
+
+
+ )
+}
+```
diff --git a/.agents/skills/vercel-react-best-practices/rules/server-serialization.md b/.agents/skills/vercel-react-best-practices/rules/server-serialization.md
new file mode 100644
index 000000000000..39c5c4164c31
--- /dev/null
+++ b/.agents/skills/vercel-react-best-practices/rules/server-serialization.md
@@ -0,0 +1,38 @@
+---
+title: Minimize Serialization at RSC Boundaries
+impact: HIGH
+impactDescription: reduces data transfer size
+tags: server, rsc, serialization, props
+---
+
+## Minimize Serialization at RSC Boundaries
+
+The React Server/Client boundary serializes all object properties into strings and embeds them in the HTML response and subsequent RSC requests. This serialized data directly impacts page weight and load time, so **size matters a lot**. Only pass fields that the client actually uses.
+
+**Incorrect (serializes all 50 fields):**
+
+```tsx
+async function Page() {
+ const user = await fetchUser() // 50 fields
+ return
+}
+
+'use client'
+function Profile({ user }: { user: User }) {
+ return
{user.name}
// uses 1 field
+}
+```
+
+**Correct (serializes only 1 field):**
+
+```tsx
+async function Page() {
+ const user = await fetchUser()
+ return
+}
+
+'use client'
+function Profile({ name }: { name: string }) {
+ return
{name}
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/AGENTS.md b/.agents/skills/vercel-react-native-skills/AGENTS.md
new file mode 100644
index 000000000000..d263eb9c1110
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/AGENTS.md
@@ -0,0 +1,2897 @@
+# React Native Skills
+
+**Version 1.0.0**
+Engineering
+January 2026
+
+> **Note:**
+> This document is mainly for agents and LLMs to follow when maintaining,
+> generating, or refactoring React Native codebases. Humans
+> may also find it useful, but guidance here is optimized for automation
+> and consistency by AI-assisted workflows.
+
+---
+
+## Abstract
+
+Comprehensive performance optimization guide for React Native applications, designed for AI agents and LLMs. Contains 35+ rules across 13 categories, prioritized by impact from critical (core rendering, list performance) to incremental (fonts, imports). Each rule includes detailed explanations, real-world examples comparing incorrect vs. correct implementations, and specific impact metrics to guide automated refactoring and code generation.
+
+---
+
+## Table of Contents
+
+1. [Core Rendering](#1-core-rendering) — **CRITICAL**
+ - 1.1 [Never Use && with Potentially Falsy Values](#11-never-use--with-potentially-falsy-values)
+ - 1.2 [Wrap Strings in Text Components](#12-wrap-strings-in-text-components)
+2. [List Performance](#2-list-performance) — **HIGH**
+ - 2.1 [Avoid Inline Objects in renderItem](#21-avoid-inline-objects-in-renderitem)
+ - 2.2 [Hoist callbacks to the root of lists](#22-hoist-callbacks-to-the-root-of-lists)
+ - 2.3 [Keep List Items Lightweight](#23-keep-list-items-lightweight)
+ - 2.4 [Optimize List Performance with Stable Object References](#24-optimize-list-performance-with-stable-object-references)
+ - 2.5 [Pass Primitives to List Items for Memoization](#25-pass-primitives-to-list-items-for-memoization)
+ - 2.6 [Use a List Virtualizer for Any List](#26-use-a-list-virtualizer-for-any-list)
+ - 2.7 [Use Compressed Images in Lists](#27-use-compressed-images-in-lists)
+ - 2.8 [Use Item Types for Heterogeneous Lists](#28-use-item-types-for-heterogeneous-lists)
+3. [Animation](#3-animation) — **HIGH**
+ - 3.1 [Animate Transform and Opacity Instead of Layout Properties](#31-animate-transform-and-opacity-instead-of-layout-properties)
+ - 3.2 [Prefer useDerivedValue Over useAnimatedReaction](#32-prefer-usederivedvalue-over-useanimatedreaction)
+ - 3.3 [Use GestureDetector for Animated Press States](#33-use-gesturedetector-for-animated-press-states)
+4. [Scroll Performance](#4-scroll-performance) — **HIGH**
+ - 4.1 [Never Track Scroll Position in useState](#41-never-track-scroll-position-in-usestate)
+5. [Navigation](#5-navigation) — **HIGH**
+ - 5.1 [Use Native Navigators for Navigation](#51-use-native-navigators-for-navigation)
+6. [React State](#6-react-state) — **MEDIUM**
+ - 6.1 [Minimize State Variables and Derive Values](#61-minimize-state-variables-and-derive-values)
+ - 6.2 [Use fallback state instead of initialState](#62-use-fallback-state-instead-of-initialstate)
+ - 6.3 [useState Dispatch updaters for State That Depends on Current Value](#63-usestate-dispatch-updaters-for-state-that-depends-on-current-value)
+7. [State Architecture](#7-state-architecture) — **MEDIUM**
+ - 7.1 [State Must Represent Ground Truth](#71-state-must-represent-ground-truth)
+8. [React Compiler](#8-react-compiler) — **MEDIUM**
+ - 8.1 [Destructure Functions Early in Render (React Compiler)](#81-destructure-functions-early-in-render-react-compiler)
+ - 8.2 [Use .get() and .set() for Reanimated Shared Values (not .value)](#82-use-get-and-set-for-reanimated-shared-values-not-value)
+9. [User Interface](#9-user-interface) — **MEDIUM**
+ - 9.1 [Measuring View Dimensions](#91-measuring-view-dimensions)
+ - 9.2 [Modern React Native Styling Patterns](#92-modern-react-native-styling-patterns)
+ - 9.3 [Use contentInset for Dynamic ScrollView Spacing](#93-use-contentinset-for-dynamic-scrollview-spacing)
+ - 9.4 [Use contentInsetAdjustmentBehavior for Safe Areas](#94-use-contentinsetadjustmentbehavior-for-safe-areas)
+ - 9.5 [Use expo-image for Optimized Images](#95-use-expo-image-for-optimized-images)
+ - 9.6 [Use Galeria for Image Galleries and Lightbox](#96-use-galeria-for-image-galleries-and-lightbox)
+ - 9.7 [Use Native Menus for Dropdowns and Context Menus](#97-use-native-menus-for-dropdowns-and-context-menus)
+ - 9.8 [Use Native Modals Over JS-Based Bottom Sheets](#98-use-native-modals-over-js-based-bottom-sheets)
+ - 9.9 [Use Pressable Instead of Touchable Components](#99-use-pressable-instead-of-touchable-components)
+10. [Design System](#10-design-system) — **MEDIUM**
+ - 10.1 [Use Compound Components Over Polymorphic Children](#101-use-compound-components-over-polymorphic-children)
+11. [Monorepo](#11-monorepo) — **LOW**
+ - 11.1 [Install Native Dependencies in App Directory](#111-install-native-dependencies-in-app-directory)
+ - 11.2 [Use Single Dependency Versions Across Monorepo](#112-use-single-dependency-versions-across-monorepo)
+12. [Third-Party Dependencies](#12-third-party-dependencies) — **LOW**
+ - 12.1 [Import from Design System Folder](#121-import-from-design-system-folder)
+13. [JavaScript](#13-javascript) — **LOW**
+ - 13.1 [Hoist Intl Formatter Creation](#131-hoist-intl-formatter-creation)
+14. [Fonts](#14-fonts) — **LOW**
+ - 14.1 [Load fonts natively at build time](#141-load-fonts-natively-at-build-time)
+
+---
+
+## 1. Core Rendering
+
+**Impact: CRITICAL**
+
+Fundamental React Native rendering rules. Violations cause
+runtime crashes or broken UI.
+
+### 1.1 Never Use && with Potentially Falsy Values
+
+**Impact: CRITICAL (prevents production crash)**
+
+Never use `{value && }` when `value` could be an empty string or
+
+`0`. These are falsy but JSX-renderable—React Native will try to render them as
+
+text outside a `` component, causing a hard crash in production.
+
+**Incorrect: crashes if count is 0 or name is ""**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {name && {name}}
+ {count && {count} items}
+
+ )
+}
+// If name="" or count=0, renders the falsy value → crash
+```
+
+**Correct: ternary with null**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {name ? {name} : null}
+ {count ? {count} items : null}
+
+ )
+}
+```
+
+**Correct: explicit boolean coercion**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {!!name && {name}}
+ {!!count && {count} items}
+
+ )
+}
+```
+
+**Best: early return**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ if (!name) return null
+
+ return (
+
+ {name}
+ {count > 0 ? {count} items : null}
+
+ )
+}
+```
+
+Early returns are clearest. When using conditionals inline, prefer ternary or
+
+explicit boolean checks.
+
+**Lint rule:** Enable `react/jsx-no-leaked-render` from
+
+[eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/jsx-no-leaked-render.md)
+
+to catch this automatically.
+
+### 1.2 Wrap Strings in Text Components
+
+**Impact: CRITICAL (prevents runtime crash)**
+
+Strings must be rendered inside ``. React Native crashes if a string is a
+
+direct child of ``.
+
+**Incorrect: crashes**
+
+```tsx
+import { View } from 'react-native'
+
+function Greeting({ name }: { name: string }) {
+ return Hello, {name}!
+}
+// Error: Text strings must be rendered within a component.
+```
+
+**Correct:**
+
+```tsx
+import { View, Text } from 'react-native'
+
+function Greeting({ name }: { name: string }) {
+ return (
+
+ Hello, {name}!
+
+ )
+}
+```
+
+---
+
+## 2. List Performance
+
+**Impact: HIGH**
+
+Optimizing virtualized lists (FlatList, LegendList, FlashList)
+for smooth scrolling and fast updates.
+
+### 2.1 Avoid Inline Objects in renderItem
+
+**Impact: HIGH (prevents unnecessary re-renders of memoized list items)**
+
+Don't create new objects inside `renderItem` to pass as props. Inline objects
+
+create new references on every render, breaking memoization. Pass primitive
+
+values directly from `item` instead.
+
+**Incorrect: inline object breaks memoization**
+
+```tsx
+function UserList({ users }: { users: User[] }) {
+ return (
+ (
+
+ )}
+ />
+ )
+}
+```
+
+**Incorrect: inline style object**
+
+```tsx
+renderItem={({ item }) => (
+
+)}
+```
+
+**Correct: pass item directly or primitives**
+
+```tsx
+function UserList({ users }: { users: User[] }) {
+ return (
+ (
+ // Good: pass the item directly
+
+ )}
+ />
+ )
+}
+```
+
+**Correct: pass primitives, derive inside child**
+
+```tsx
+renderItem={({ item }) => (
+
+)}
+
+const UserRow = memo(function UserRow({ id, name, isActive }: Props) {
+ // Good: derive style inside memoized component
+ const backgroundColor = isActive ? 'green' : 'gray'
+ return {/* ... */}
+})
+```
+
+**Correct: hoist static styles in module scope**
+
+```tsx
+const activeStyle = { backgroundColor: 'green' }
+const inactiveStyle = { backgroundColor: 'gray' }
+
+renderItem={({ item }) => (
+
+)}
+```
+
+Passing primitives or stable references allows `memo()` to skip re-renders when
+
+the actual values haven't changed.
+
+**Note:** If you have the React Compiler enabled, it handles memoization
+
+automatically and these manual optimizations become less critical.
+
+### 2.2 Hoist callbacks to the root of lists
+
+**Impact: MEDIUM (Fewer re-renders and faster lists)**
+
+When passing callback functions to list items, create a single instance of the
+
+callback at the root of the list. Items should then call it with a unique
+
+identifier.
+
+**Incorrect: creates a new callback on each render**
+
+```typescript
+return (
+ {
+ // bad: creates a new callback on each render
+ const onPress = () => handlePress(item.id)
+ return
+ }}
+ />
+)
+```
+
+**Correct: a single function instance passed to each item**
+
+```typescript
+const onPress = useCallback(() => handlePress(item.id), [handlePress, item.id])
+
+return (
+ (
+
+ )}
+ />
+)
+```
+
+Reference: [https://example.com](https://example.com)
+
+### 2.3 Keep List Items Lightweight
+
+**Impact: HIGH (reduces render time for visible items during scroll)**
+
+List items should be as inexpensive as possible to render. Minimize hooks, avoid
+
+queries, and limit React Context access. Virtualized lists render many items
+
+during scroll—expensive items cause jank.
+
+**Incorrect: heavy list item**
+
+```tsx
+function ProductRow({ id }: { id: string }) {
+ // Bad: query inside list item
+ const { data: product } = useQuery(['product', id], () => fetchProduct(id))
+ // Bad: multiple context accesses
+ const theme = useContext(ThemeContext)
+ const user = useContext(UserContext)
+ const cart = useContext(CartContext)
+ // Bad: expensive computation
+ const recommendations = useMemo(
+ () => computeRecommendations(product),
+ [product]
+ )
+
+ return {/* ... */}
+}
+```
+
+**Correct: lightweight list item**
+
+```tsx
+function ProductRow({ name, price, imageUrl }: Props) {
+ // Good: receives only primitives, minimal hooks
+ return (
+
+
+ {name}
+ {price}
+
+ )
+}
+```
+
+**Move data fetching to parent:**
+
+```tsx
+// Parent fetches all data once
+function ProductList() {
+ const { data: products } = useQuery(['products'], fetchProducts)
+
+ return (
+ (
+
+ )}
+ />
+ )
+}
+```
+
+**For shared values, use Zustand selectors instead of Context:**
+
+```tsx
+// Incorrect: Context causes re-render when any cart value changes
+function ProductRow({ id, name }: Props) {
+ const { items } = useContext(CartContext)
+ const inCart = items.includes(id)
+ // ...
+}
+
+// Correct: Zustand selector only re-renders when this specific value changes
+function ProductRow({ id, name }: Props) {
+ // use Set.has (created once at the root) instead of Array.includes()
+ const inCart = useCartStore((s) => s.items.has(id))
+ // ...
+}
+```
+
+**Guidelines for list items:**
+
+- No queries or data fetching
+
+- No expensive computations (move to parent or memoize at parent level)
+
+- Prefer Zustand selectors over React Context
+
+- Minimize useState/useEffect hooks
+
+- Pass pre-computed values as props
+
+The goal: list items should be simple rendering functions that take props and
+
+return JSX.
+
+### 2.4 Optimize List Performance with Stable Object References
+
+**Impact: CRITICAL (virtualization relies on reference stability)**
+
+Don't map or filter data before passing to virtualized lists. Virtualization
+
+relies on object reference stability to know what changed—new references cause
+
+full re-renders of all visible items. Attempt to prevent frequent renders at the
+
+list-parent level.
+
+Where needed, use context selectors within list items.
+
+**Incorrect: creates new object references on every keystroke**
+
+```tsx
+function DomainSearch() {
+ const { keyword, setKeyword } = useKeywordZustandState()
+ const { data: tlds } = useTlds()
+
+ // Bad: creates new objects on every render, reparenting the entire list on every keystroke
+ const domains = tlds.map((tld) => ({
+ domain: `${keyword}.${tld.name}`,
+ tld: tld.name,
+ price: tld.price,
+ }))
+
+ return (
+ <>
+
+ }
+ />
+
+ )
+}
+```
+
+**Correct: stable references, transform inside items**
+
+```tsx
+const renderItem = ({ item }) =>
+
+function DomainSearch() {
+ const { data: tlds } = useTlds()
+
+ return (
+
+ )
+}
+
+function DomainItem({ tld }: { tld: Tld }) {
+ // good: transform within items, and don't pass the dynamic data as a prop
+ // good: use a selector function from zustand to receive a stable string back
+ const domain = useKeywordZustandState((s) => s.keyword + '.' + tld.name)
+ return {domain}
+}
+```
+
+**Updating parent array reference:**
+
+```tsx
+// good: creates a new array instance without mutating the inner objects
+// good: parent array reference is unaffected by typing and updating "keyword"
+const sortedTlds = tlds.toSorted((a, b) => a.name.localeCompare(b.name))
+
+return
+```
+
+Creating a new array instance can be okay, as long as its inner object
+
+references are stable. For instance, if you sort a list of objects:
+
+Even though this creates a new array instance `sortedTlds`, the inner object
+
+references are stable.
+
+**With zustand for dynamic data: avoids parent re-renders**
+
+```tsx
+function DomainItemFavoriteButton({ tld }: { tld: Tld }) {
+ const isFavorited = useFavoritesStore((s) => s.favorites.has(tld.id))
+ return
+}
+```
+
+Virtualization can now skip items that haven't changed when typing. Only visible
+
+items (~20) re-render on keystroke, rather than the parent.
+
+**Deriving state within list items based on parent data (avoids parent
+
+re-renders):**
+
+For components where the data is conditional based on the parent state, this
+
+pattern is even more important. For example, if you are checking if an item is
+
+favorited, toggling favorites only re-renders one component if the item itself
+
+is in charge of accessing the state rather than the parent:
+
+Note: if you're using the React Compiler, you can read React Context values
+
+directly within list items. Although this is slightly slower than using a
+
+Zustand selector in most cases, the effect may be negligible.
+
+### 2.5 Pass Primitives to List Items for Memoization
+
+**Impact: HIGH (enables effective memo() comparison)**
+
+When possible, pass only primitive values (strings, numbers, booleans) as props
+
+to list item components. Primitives enable shallow comparison in `memo()` to
+
+work correctly, skipping re-renders when values haven't changed.
+
+**Incorrect: object prop requires deep comparison**
+
+```tsx
+type User = { id: string; name: string; email: string; avatar: string }
+
+const UserRow = memo(function UserRow({ user }: { user: User }) {
+ // memo() compares user by reference, not value
+ // If parent creates new user object, this re-renders even if data is same
+ return {user.name}
+})
+
+renderItem={({ item }) => }
+```
+
+This can still be optimized, but it is harder to memoize properly.
+
+**Correct: primitive props enable shallow comparison**
+
+```tsx
+const UserRow = memo(function UserRow({
+ id,
+ name,
+ email,
+}: {
+ id: string
+ name: string
+ email: string
+}) {
+ // memo() compares each primitive directly
+ // Re-renders only if id, name, or email actually changed
+ return {name}
+})
+
+renderItem={({ item }) => (
+
+)}
+```
+
+**Pass only what you need:**
+
+```tsx
+// Incorrect: passing entire item when you only need name
+
+
+// Correct: pass only the fields the component uses
+
+```
+
+**For callbacks, hoist or use item ID:**
+
+```tsx
+// Incorrect: inline function creates new reference
+ handlePress(item.id)} />
+
+// Correct: pass ID, handle in child
+
+
+const UserRow = memo(function UserRow({ id, name }: Props) {
+ const handlePress = useCallback(() => {
+ // use id here
+ }, [id])
+ return {name}
+})
+```
+
+Primitive props make memoization predictable and effective.
+
+**Note:** If you have the React Compiler enabled, you do not need to use
+
+`memo()` or `useCallback()`, but the object references still apply.
+
+### 2.6 Use a List Virtualizer for Any List
+
+**Impact: HIGH (reduced memory, faster mounts)**
+
+Use a list virtualizer like LegendList or FlashList instead of ScrollView with
+
+mapped children—even for short lists. Virtualizers only render visible items,
+
+reducing memory usage and mount time. ScrollView renders all children upfront,
+
+which gets expensive quickly.
+
+**Incorrect: ScrollView renders all items at once**
+
+```tsx
+function Feed({ items }: { items: Item[] }) {
+ return (
+
+ {items.map((item) => (
+
+ ))}
+
+ )
+}
+// 50 items = 50 components mounted, even if only 10 visible
+```
+
+**Correct: virtualizer renders only visible items**
+
+```tsx
+import { LegendList } from '@legendapp/list'
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ keyExtractor={(item) => item.id}
+ estimatedItemSize={80}
+ />
+ )
+}
+// Only ~10-15 visible items mounted at a time
+```
+
+**Alternative: FlashList**
+
+```tsx
+import { FlashList } from '@shopify/flash-list'
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ keyExtractor={(item) => item.id}
+ />
+ )
+}
+```
+
+Benefits apply to any screen with scrollable content—profiles, settings, feeds,
+
+search results. Default to virtualization.
+
+### 2.7 Use Compressed Images in Lists
+
+**Impact: HIGH (faster load times, less memory)**
+
+Always load compressed, appropriately-sized images in lists. Full-resolution
+
+images consume excessive memory and cause scroll jank. Request thumbnails from
+
+your server or use an image CDN with resize parameters.
+
+**Incorrect: full-resolution images**
+
+```tsx
+function ProductItem({ product }: { product: Product }) {
+ return (
+
+ {/* 4000x3000 image loaded for a 100x100 thumbnail */}
+
+ {product.name}
+
+ )
+}
+```
+
+**Correct: request appropriately-sized image**
+
+```tsx
+function ProductItem({ product }: { product: Product }) {
+ // Request a 200x200 image (2x for retina)
+ const thumbnailUrl = `${product.imageUrl}?w=200&h=200&fit=cover`
+
+ return (
+
+
+ {product.name}
+
+ )
+}
+```
+
+Use an optimized image component with built-in caching and placeholder support,
+
+such as `expo-image` or `SolitoImage` (which uses `expo-image` under the hood).
+
+Request images at 2x the display size for retina screens.
+
+### 2.8 Use Item Types for Heterogeneous Lists
+
+**Impact: HIGH (efficient recycling, less layout thrashing)**
+
+When a list has different item layouts (messages, images, headers, etc.), use a
+
+`type` field on each item and provide `getItemType` to the list. This puts items
+
+into separate recycling pools so a message component never gets recycled into an
+
+image component.
+
+[LegendList getItemType](https://legendapp.com/open-source/list/api/props/#getitemtype-v2)
+
+**Incorrect: single component with conditionals**
+
+```tsx
+type Item = { id: string; text?: string; imageUrl?: string; isHeader?: boolean }
+
+function ListItem({ item }: { item: Item }) {
+ if (item.isHeader) {
+ return
+ }
+ if (item.imageUrl) {
+ return
+ }
+ return
+}
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ recycleItems
+ />
+ )
+}
+```
+
+**Correct: typed items with separate components**
+
+```tsx
+type HeaderItem = { id: string; type: 'header'; title: string }
+type MessageItem = { id: string; type: 'message'; text: string }
+type ImageItem = { id: string; type: 'image'; url: string }
+type FeedItem = HeaderItem | MessageItem | ImageItem
+
+function Feed({ items }: { items: FeedItem[] }) {
+ return (
+ item.id}
+ getItemType={(item) => item.type}
+ renderItem={({ item }) => {
+ switch (item.type) {
+ case 'header':
+ return
+ case 'message':
+ return
+ case 'image':
+ return
+ }
+ }}
+ recycleItems
+ />
+ )
+}
+```
+
+**Why this matters:**
+
+```tsx
+ item.id}
+ getItemType={(item) => item.type}
+ getEstimatedItemSize={(index, item, itemType) => {
+ switch (itemType) {
+ case 'header':
+ return 48
+ case 'message':
+ return 72
+ case 'image':
+ return 300
+ default:
+ return 72
+ }
+ }}
+ renderItem={({ item }) => {
+ /* ... */
+ }}
+ recycleItems
+/>
+```
+
+- **Recycling efficiency**: Items with the same type share a recycling pool
+
+- **No layout thrashing**: A header never recycles into an image cell
+
+- **Type safety**: TypeScript can narrow the item type in each branch
+
+- **Better size estimation**: Use `getEstimatedItemSize` with `itemType` for
+
+ accurate estimates per type
+
+---
+
+## 3. Animation
+
+**Impact: HIGH**
+
+GPU-accelerated animations, Reanimated patterns, and avoiding
+render thrashing during gestures.
+
+### 3.1 Animate Transform and Opacity Instead of Layout Properties
+
+**Impact: HIGH (GPU-accelerated animations, no layout recalculation)**
+
+Avoid animating `width`, `height`, `top`, `left`, `margin`, or `padding`. These trigger layout recalculation on every frame. Instead, use `transform` (scale, translate) and `opacity` which run on the GPU without triggering layout.
+
+**Incorrect: animates height, triggers layout every frame**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function CollapsiblePanel({ expanded }: { expanded: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ height: withTiming(expanded ? 200 : 0), // triggers layout on every frame
+ overflow: 'hidden',
+ }))
+
+ return {children}
+}
+```
+
+**Correct: animates scaleY, GPU-accelerated**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function CollapsiblePanel({ expanded }: { expanded: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { scaleY: withTiming(expanded ? 1 : 0) },
+ ],
+ opacity: withTiming(expanded ? 1 : 0),
+ }))
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**Correct: animates translateY for slide animations**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function SlideIn({ visible }: { visible: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { translateY: withTiming(visible ? 0 : 100) },
+ ],
+ opacity: withTiming(visible ? 1 : 0),
+ }))
+
+ return {children}
+}
+```
+
+GPU-accelerated properties: `transform` (translate, scale, rotate), `opacity`. Everything else triggers layout.
+
+### 3.2 Prefer useDerivedValue Over useAnimatedReaction
+
+**Impact: MEDIUM (cleaner code, automatic dependency tracking)**
+
+When deriving a shared value from another, use `useDerivedValue` instead of
+
+`useAnimatedReaction`. Derived values are declarative, automatically track
+
+dependencies, and return a value you can use directly. Animated reactions are
+
+for side effects, not derivations.
+
+[Reanimated useDerivedValue](https://docs.swmansion.com/react-native-reanimated/docs/core/useDerivedValue)
+
+**Incorrect: useAnimatedReaction for derivation**
+
+```tsx
+import { useSharedValue, useAnimatedReaction } from 'react-native-reanimated'
+
+function MyComponent() {
+ const progress = useSharedValue(0)
+ const opacity = useSharedValue(1)
+
+ useAnimatedReaction(
+ () => progress.value,
+ (current) => {
+ opacity.value = 1 - current
+ }
+ )
+
+ // ...
+}
+```
+
+**Correct: useDerivedValue**
+
+```tsx
+import { useSharedValue, useDerivedValue } from 'react-native-reanimated'
+
+function MyComponent() {
+ const progress = useSharedValue(0)
+
+ const opacity = useDerivedValue(() => 1 - progress.get())
+
+ // ...
+}
+```
+
+Use `useAnimatedReaction` only for side effects that don't produce a value
+
+(e.g., triggering haptics, logging, calling `runOnJS`).
+
+### 3.3 Use GestureDetector for Animated Press States
+
+**Impact: MEDIUM (UI thread animations, smoother press feedback)**
+
+For animated press states (scale, opacity on press), use `GestureDetector` with
+
+`Gesture.Tap()` and shared values instead of Pressable's
+
+`onPressIn`/`onPressOut`. Gesture callbacks run on the UI thread as worklets—no
+
+JS thread round-trip for press animations.
+
+[Gesture Handler Tap Gesture](https://docs.swmansion.com/react-native-gesture-handler/docs/gestures/tap-gesture)
+
+**Incorrect: Pressable with JS thread callbacks**
+
+```tsx
+import { Pressable } from 'react-native'
+import Animated, {
+ useSharedValue,
+ useAnimatedStyle,
+ withTiming,
+} from 'react-native-reanimated'
+
+function AnimatedButton({ onPress }: { onPress: () => void }) {
+ const scale = useSharedValue(1)
+
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: scale.value }],
+ }))
+
+ return (
+ (scale.value = withTiming(0.95))}
+ onPressOut={() => (scale.value = withTiming(1))}
+ >
+
+ Press me
+
+
+ )
+}
+```
+
+**Correct: GestureDetector with UI thread worklets**
+
+```tsx
+import { Gesture, GestureDetector } from 'react-native-gesture-handler'
+import Animated, {
+ useSharedValue,
+ useAnimatedStyle,
+ withTiming,
+ interpolate,
+ runOnJS,
+} from 'react-native-reanimated'
+
+function AnimatedButton({ onPress }: { onPress: () => void }) {
+ // Store the press STATE (0 = not pressed, 1 = pressed)
+ const pressed = useSharedValue(0)
+
+ const tap = Gesture.Tap()
+ .onBegin(() => {
+ pressed.set(withTiming(1))
+ })
+ .onFinalize(() => {
+ pressed.set(withTiming(0))
+ })
+ .onEnd(() => {
+ runOnJS(onPress)()
+ })
+
+ // Derive visual values from the state
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { scale: interpolate(withTiming(pressed.get()), [0, 1], [1, 0.95]) },
+ ],
+ }))
+
+ return (
+
+
+ Press me
+
+
+ )
+}
+```
+
+Store the press **state** (0 or 1), then derive the scale via `interpolate`.
+
+This keeps the shared value as ground truth. Use `runOnJS` to call JS functions
+
+from worklets. Use `.set()` and `.get()` for React Compiler compatibility.
+
+---
+
+## 4. Scroll Performance
+
+**Impact: HIGH**
+
+Tracking scroll position without causing render thrashing.
+
+### 4.1 Never Track Scroll Position in useState
+
+**Impact: HIGH (prevents render thrashing during scroll)**
+
+Never store scroll position in `useState`. Scroll events fire rapidly—state
+
+updates cause render thrashing and dropped frames. Use a Reanimated shared value
+
+for animations or a ref for non-reactive tracking.
+
+**Incorrect: useState causes jank**
+
+```tsx
+import { useState } from 'react'
+import {
+ ScrollView,
+ NativeSyntheticEvent,
+ NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+ const [scrollY, setScrollY] = useState(0)
+
+ const onScroll = (e: NativeSyntheticEvent) => {
+ setScrollY(e.nativeEvent.contentOffset.y) // re-renders on every frame
+ }
+
+ return
+}
+```
+
+**Correct: Reanimated for animations**
+
+```tsx
+import Animated, {
+ useSharedValue,
+ useAnimatedScrollHandler,
+} from 'react-native-reanimated'
+
+function Feed() {
+ const scrollY = useSharedValue(0)
+
+ const onScroll = useAnimatedScrollHandler({
+ onScroll: (e) => {
+ scrollY.value = e.contentOffset.y // runs on UI thread, no re-render
+ },
+ })
+
+ return (
+
+ )
+}
+```
+
+**Correct: ref for non-reactive tracking**
+
+```tsx
+import { useRef } from 'react'
+import {
+ ScrollView,
+ NativeSyntheticEvent,
+ NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+ const scrollY = useRef(0)
+
+ const onScroll = (e: NativeSyntheticEvent) => {
+ scrollY.current = e.nativeEvent.contentOffset.y // no re-render
+ }
+
+ return
+}
+```
+
+---
+
+## 5. Navigation
+
+**Impact: HIGH**
+
+Using native navigators for stack and tab navigation instead of
+JS-based alternatives.
+
+### 5.1 Use Native Navigators for Navigation
+
+**Impact: HIGH (native performance, platform-appropriate UI)**
+
+Always use native navigators instead of JS-based ones. Native navigators use
+
+platform APIs (UINavigationController on iOS, Fragment on Android) for better
+
+performance and native behavior.
+
+**For stacks:** Use `@react-navigation/native-stack` or expo-router's default
+
+stack (which uses native-stack). Avoid `@react-navigation/stack`.
+
+**For tabs:** Use `react-native-bottom-tabs` (native) or expo-router's native
+
+tabs. Avoid `@react-navigation/bottom-tabs` when native feel matters.
+
+- [React Navigation Native Stack](https://reactnavigation.org/docs/native-stack-navigator)
+
+- [React Native Bottom Tabs with React Navigation](https://oss.callstack.com/react-native-bottom-tabs/docs/guides/usage-with-react-navigation)
+
+- [React Native Bottom Tabs with Expo Router](https://oss.callstack.com/react-native-bottom-tabs/docs/guides/usage-with-expo-router)
+
+- [Expo Router Native Tabs](https://docs.expo.dev/router/advanced/native-tabs)
+
+**Incorrect: JS stack navigator**
+
+```tsx
+import { createStackNavigator } from '@react-navigation/stack'
+
+const Stack = createStackNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct: native stack with react-navigation**
+
+```tsx
+import { createNativeStackNavigator } from '@react-navigation/native-stack'
+
+const Stack = createNativeStackNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct: expo-router uses native stack by default**
+
+```tsx
+// app/_layout.tsx
+import { Stack } from 'expo-router'
+
+export default function Layout() {
+ return
+}
+```
+
+**Incorrect: JS bottom tabs**
+
+```tsx
+import { createBottomTabNavigator } from '@react-navigation/bottom-tabs'
+
+const Tab = createBottomTabNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct: native bottom tabs with react-navigation**
+
+```tsx
+import { createNativeBottomTabNavigator } from '@bottom-tabs/react-navigation'
+
+const Tab = createNativeBottomTabNavigator()
+
+function App() {
+ return (
+
+ ({ sfSymbol: 'house' }),
+ }}
+ />
+ ({ sfSymbol: 'gear' }),
+ }}
+ />
+
+ )
+}
+```
+
+**Correct: expo-router native tabs**
+
+```tsx
+// app/(tabs)/_layout.tsx
+import { NativeTabs } from 'expo-router/unstable-native-tabs'
+
+export default function TabLayout() {
+ return (
+
+
+ Home
+
+
+
+ Settings
+
+
+
+ )
+}
+```
+
+On iOS, native tabs automatically enable `contentInsetAdjustmentBehavior` on the
+
+first `ScrollView` at the root of each tab screen, so content scrolls correctly
+
+behind the translucent tab bar. If you need to disable this, use
+
+`disableAutomaticContentInsets` on the trigger.
+
+**Incorrect: custom header component**
+
+```tsx
+,
+ }}
+/>
+```
+
+**Correct: native header options**
+
+```tsx
+
+```
+
+Native headers support iOS large titles, search bars, blur effects, and proper
+
+safe area handling automatically.
+
+- **Performance**: Native transitions and gestures run on the UI thread
+
+- **Platform behavior**: Automatic iOS large titles, Android material design
+
+- **System integration**: Scroll-to-top on tab tap, PiP avoidance, proper safe
+
+ areas
+
+- **Accessibility**: Platform accessibility features work automatically
+
+---
+
+## 6. React State
+
+**Impact: MEDIUM**
+
+Patterns for managing React state to avoid stale closures and
+unnecessary re-renders.
+
+### 6.1 Minimize State Variables and Derive Values
+
+**Impact: MEDIUM (fewer re-renders, less state drift)**
+
+Use the fewest state variables possible. If a value can be computed from existing state or props, derive it during render instead of storing it in state. Redundant state causes unnecessary re-renders and can drift out of sync.
+
+**Incorrect: redundant state**
+
+```tsx
+function Cart({ items }: { items: Item[] }) {
+ const [total, setTotal] = useState(0)
+ const [itemCount, setItemCount] = useState(0)
+
+ useEffect(() => {
+ setTotal(items.reduce((sum, item) => sum + item.price, 0))
+ setItemCount(items.length)
+ }, [items])
+
+ return (
+
+ {itemCount} items
+ Total: ${total}
+
+ )
+}
+```
+
+**Correct: derived values**
+
+```tsx
+function Cart({ items }: { items: Item[] }) {
+ const total = items.reduce((sum, item) => sum + item.price, 0)
+ const itemCount = items.length
+
+ return (
+
+ {itemCount} items
+ Total: ${total}
+
+ )
+}
+```
+
+**Another example:**
+
+```tsx
+// Incorrect: storing both firstName, lastName, AND fullName
+const [firstName, setFirstName] = useState('')
+const [lastName, setLastName] = useState('')
+const [fullName, setFullName] = useState('')
+
+// Correct: derive fullName
+const [firstName, setFirstName] = useState('')
+const [lastName, setLastName] = useState('')
+const fullName = `${firstName} ${lastName}`
+```
+
+State should be the minimal source of truth. Everything else is derived.
+
+Reference: [https://react.dev/learn/choosing-the-state-structure](https://react.dev/learn/choosing-the-state-structure)
+
+### 6.2 Use fallback state instead of initialState
+
+**Impact: MEDIUM (reactive fallbacks without syncing)**
+
+Use `undefined` as initial state and nullish coalescing (`??`) to fall back to
+
+parent or server values. State represents user intent only—`undefined` means
+
+"user hasn't chosen yet." This enables reactive fallbacks that update when the
+
+source changes, not just on initial render.
+
+**Incorrect: syncs state, loses reactivity**
+
+```tsx
+type Props = { fallbackEnabled: boolean }
+
+function Toggle({ fallbackEnabled }: Props) {
+ const [enabled, setEnabled] = useState(defaultEnabled)
+ // If fallbackEnabled changes, state is stale
+ // State mixes user intent with default value
+
+ return
+}
+```
+
+**Correct: state is user intent, reactive fallback**
+
+```tsx
+type Props = { fallbackEnabled: boolean }
+
+function Toggle({ fallbackEnabled }: Props) {
+ const [_enabled, setEnabled] = useState(undefined)
+ const enabled = _enabled ?? defaultEnabled
+ // undefined = user hasn't touched it, falls back to prop
+ // If defaultEnabled changes, component reflects it
+ // Once user interacts, their choice persists
+
+ return
+}
+```
+
+**With server data:**
+
+```tsx
+function ProfileForm({ data }: { data: User }) {
+ const [_theme, setTheme] = useState(undefined)
+ const theme = _theme ?? data.theme
+ // Shows server value until user overrides
+ // Server refetch updates the fallback automatically
+
+ return
+}
+```
+
+### 6.3 useState Dispatch updaters for State That Depends on Current Value
+
+**Impact: MEDIUM (avoids stale closures, prevents unnecessary re-renders)**
+
+When the next state depends on the current state, use a dispatch updater
+
+(`setState(prev => ...)`) instead of reading the state variable directly in a
+
+callback. This avoids stale closures and ensures you're comparing against the
+
+latest value.
+
+**Incorrect: reads state directly**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ // size may be stale in this closure
+ if (size?.width !== width || size?.height !== height) {
+ setSize({ width, height })
+ }
+}
+```
+
+**Correct: dispatch updater**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => {
+ if (prev?.width === width && prev?.height === height) return prev
+ return { width, height }
+ })
+}
+```
+
+Returning the previous value from the updater skips the re-render.
+
+For primitive states, you don't need to compare values before firing a
+
+re-render.
+
+**Incorrect: unnecessary comparison for primitive state**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => (prev === width ? prev : width))
+}
+```
+
+**Correct: sets primitive state directly**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize(width)
+}
+```
+
+However, if the next state depends on the current state, you should still use a
+
+dispatch updater.
+
+**Incorrect: reads state directly from the callback**
+
+```tsx
+const [count, setCount] = useState(0)
+
+const onTap = () => {
+ setCount(count + 1)
+}
+```
+
+**Correct: dispatch updater**
+
+```tsx
+const [count, setCount] = useState(0)
+
+const onTap = () => {
+ setCount((prev) => prev + 1)
+}
+```
+
+---
+
+## 7. State Architecture
+
+**Impact: MEDIUM**
+
+Ground truth principles for state variables and derived values.
+
+### 7.1 State Must Represent Ground Truth
+
+**Impact: HIGH (cleaner logic, easier debugging, single source of truth)**
+
+State variables—both React `useState` and Reanimated shared values—should
+
+represent the actual state of something (e.g., `pressed`, `progress`, `isOpen`),
+
+not derived visual values (e.g., `scale`, `opacity`, `translateY`). Derive
+
+visual values from state using computation or interpolation.
+
+**Incorrect: storing the visual output**
+
+```tsx
+const scale = useSharedValue(1)
+
+const tap = Gesture.Tap()
+ .onBegin(() => {
+ scale.set(withTiming(0.95))
+ })
+ .onFinalize(() => {
+ scale.set(withTiming(1))
+ })
+
+const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: scale.get() }],
+}))
+```
+
+**Correct: storing the state, deriving the visual**
+
+```tsx
+const pressed = useSharedValue(0) // 0 = not pressed, 1 = pressed
+
+const tap = Gesture.Tap()
+ .onBegin(() => {
+ pressed.set(withTiming(1))
+ })
+ .onFinalize(() => {
+ pressed.set(withTiming(0))
+ })
+
+const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: interpolate(pressed.get(), [0, 1], [1, 0.95]) }],
+}))
+```
+
+**Why this matters:**
+
+State variables should represent real "state", not necessarily a desired end
+
+result.
+
+1. **Single source of truth** — The state (`pressed`) describes what's
+
+ happening; visuals are derived
+
+2. **Easier to extend** — Adding opacity, rotation, or other effects just
+
+ requires more interpolations from the same state
+
+3. **Debugging** — Inspecting `pressed = 1` is clearer than `scale = 0.95`
+
+4. **Reusable logic** — The same `pressed` value can drive multiple visual
+
+ properties
+
+**Same principle for React state:**
+
+```tsx
+// Incorrect: storing derived values
+const [isExpanded, setIsExpanded] = useState(false)
+const [height, setHeight] = useState(0)
+
+useEffect(() => {
+ setHeight(isExpanded ? 200 : 0)
+}, [isExpanded])
+
+// Correct: derive from state
+const [isExpanded, setIsExpanded] = useState(false)
+const height = isExpanded ? 200 : 0
+```
+
+State is the minimal truth. Everything else is derived.
+
+---
+
+## 8. React Compiler
+
+**Impact: MEDIUM**
+
+Compatibility patterns for React Compiler with React Native and
+Reanimated.
+
+### 8.1 Destructure Functions Early in Render (React Compiler)
+
+**Impact: HIGH (stable references, fewer re-renders)**
+
+This rule is only applicable if you are using the React Compiler.
+
+Destructure functions from hooks at the top of render scope. Never dot into
+
+objects to call functions. Destructured functions are stable references; dotting
+
+creates new references and breaks memoization.
+
+**Incorrect: dotting into object**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton(props) {
+ const router = useRouter()
+
+ // bad: react-compiler will key the cache on "props" and "router", which are objects that change each render
+ const handlePress = () => {
+ props.onSave()
+ router.push('/success') // unstable reference
+ }
+
+ return
+}
+```
+
+**Correct: destructure early**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton({ onSave }) {
+ const { push } = useRouter()
+
+ // good: react-compiler will key on push and onSave
+ const handlePress = () => {
+ onSave()
+ push('/success') // stable reference
+ }
+
+ return
+}
+```
+
+### 8.2 Use .get() and .set() for Reanimated Shared Values (not .value)
+
+**Impact: LOW (required for React Compiler compatibility)**
+
+With React Compiler enabled, use `.get()` and `.set()` instead of reading or
+
+writing `.value` directly on Reanimated shared values. The compiler can't track
+
+property access—explicit methods ensure correct behavior.
+
+**Incorrect: breaks with React Compiler**
+
+```tsx
+import { useSharedValue } from 'react-native-reanimated'
+
+function Counter() {
+ const count = useSharedValue(0)
+
+ const increment = () => {
+ count.value = count.value + 1 // opts out of react compiler
+ }
+
+ return
+}
+```
+
+**Correct: React Compiler compatible**
+
+```tsx
+import { useSharedValue } from 'react-native-reanimated'
+
+function Counter() {
+ const count = useSharedValue(0)
+
+ const increment = () => {
+ count.set(count.get() + 1)
+ }
+
+ return
+}
+```
+
+See the
+
+[Reanimated docs](https://docs.swmansion.com/react-native-reanimated/docs/core/useSharedValue/#react-compiler-support)
+
+for more.
+
+---
+
+## 9. User Interface
+
+**Impact: MEDIUM**
+
+Native UI patterns for images, menus, modals, styling, and
+platform-consistent interfaces.
+
+### 9.1 Measuring View Dimensions
+
+**Impact: MEDIUM (synchronous measurement, avoid unnecessary re-renders)**
+
+Use both `useLayoutEffect` (synchronous) and `onLayout` (for updates). The sync
+
+measurement gives you the initial size immediately; `onLayout` keeps it current
+
+when the view changes. For non-primitive states, use a dispatch updater to
+
+compare values and avoid unnecessary re-renders.
+
+**Height only:**
+
+```tsx
+import { useLayoutEffect, useRef, useState } from 'react'
+import { View, LayoutChangeEvent } from 'react-native'
+
+function MeasuredBox({ children }: { children: React.ReactNode }) {
+ const ref = useRef(null)
+ const [height, setHeight] = useState(undefined)
+
+ useLayoutEffect(() => {
+ // Sync measurement on mount (RN 0.82+)
+ const rect = ref.current?.getBoundingClientRect()
+ if (rect) setHeight(rect.height)
+ // Pre-0.82: ref.current?.measure((x, y, w, h) => setHeight(h))
+ }, [])
+
+ const onLayout = (e: LayoutChangeEvent) => {
+ setHeight(e.nativeEvent.layout.height)
+ }
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**Both dimensions:**
+
+```tsx
+import { useLayoutEffect, useRef, useState } from 'react'
+import { View, LayoutChangeEvent } from 'react-native'
+
+type Size = { width: number; height: number }
+
+function MeasuredBox({ children }: { children: React.ReactNode }) {
+ const ref = useRef(null)
+ const [size, setSize] = useState(undefined)
+
+ useLayoutEffect(() => {
+ const rect = ref.current?.getBoundingClientRect()
+ if (rect) setSize({ width: rect.width, height: rect.height })
+ }, [])
+
+ const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => {
+ // for non-primitive states, compare values before firing a re-render
+ if (prev?.width === width && prev?.height === height) return prev
+ return { width, height }
+ })
+ }
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+Use functional setState to compare—don't read state directly in the callback.
+
+### 9.2 Modern React Native Styling Patterns
+
+**Impact: MEDIUM (consistent design, smoother borders, cleaner layouts)**
+
+Follow these styling patterns for cleaner, more consistent React Native code.
+
+**Always use `borderCurve: 'continuous'` with `borderRadius`:**
+
+**Use `gap` instead of margin for spacing between elements:**
+
+```tsx
+// Incorrect – margin on children
+
+ Title
+ Subtitle
+
+
+// Correct – gap on parent
+
+ Title
+ Subtitle
+
+```
+
+**Use `padding` for space within, `gap` for space between:**
+
+```tsx
+
+ First
+ Second
+
+```
+
+**Use `experimental_backgroundImage` for linear gradients:**
+
+```tsx
+// Incorrect – third-party gradient library
+
+
+// Correct – native CSS gradient syntax
+
+```
+
+**Use CSS `boxShadow` string syntax for shadows:**
+
+```tsx
+// Incorrect – legacy shadow objects or elevation
+{ shadowColor: '#000', shadowOffset: { width: 0, height: 2 }, shadowOpacity: 0.1 }
+{ elevation: 4 }
+
+// Correct – CSS box-shadow syntax
+{ boxShadow: '0 2px 8px rgba(0, 0, 0, 0.1)' }
+```
+
+**Avoid multiple font sizes – use weight and color for emphasis:**
+
+```tsx
+// Incorrect – varying font sizes for hierarchy
+Title
+Subtitle
+Caption
+
+// Correct – consistent size, vary weight and color
+Title
+Subtitle
+Caption
+```
+
+Limiting font sizes creates visual consistency. Use `fontWeight` (bold/semibold)
+
+and grayscale colors for hierarchy instead.
+
+### 9.3 Use contentInset for Dynamic ScrollView Spacing
+
+**Impact: LOW (smoother updates, no layout recalculation)**
+
+When adding space to the top or bottom of a ScrollView that may change
+
+(keyboard, toolbars, dynamic content), use `contentInset` instead of padding.
+
+Changing `contentInset` doesn't trigger layout recalculation—it adjusts the
+
+scroll area without re-rendering content.
+
+**Incorrect: padding causes layout recalculation**
+
+```tsx
+function Feed({ bottomOffset }: { bottomOffset: number }) {
+ return (
+
+ {children}
+
+ )
+}
+// Changing bottomOffset triggers full layout recalculation
+```
+
+**Correct: contentInset for dynamic spacing**
+
+```tsx
+function Feed({ bottomOffset }: { bottomOffset: number }) {
+ return (
+
+ {children}
+
+ )
+}
+// Changing bottomOffset only adjusts scroll bounds
+```
+
+Use `scrollIndicatorInsets` alongside `contentInset` to keep the scroll
+
+indicator aligned. For static spacing that never changes, padding is fine.
+
+### 9.4 Use contentInsetAdjustmentBehavior for Safe Areas
+
+**Impact: MEDIUM (native safe area handling, no layout shifts)**
+
+Use `contentInsetAdjustmentBehavior="automatic"` on the root ScrollView instead of wrapping content in SafeAreaView or manual padding. This lets iOS handle safe area insets natively with proper scroll behavior.
+
+**Incorrect: SafeAreaView wrapper**
+
+```tsx
+import { SafeAreaView, ScrollView, View, Text } from 'react-native'
+
+function MyScreen() {
+ return (
+
+
+
+ Content
+
+
+
+ )
+}
+```
+
+**Incorrect: manual safe area padding**
+
+```tsx
+import { ScrollView, View, Text } from 'react-native'
+import { useSafeAreaInsets } from 'react-native-safe-area-context'
+
+function MyScreen() {
+ const insets = useSafeAreaInsets()
+
+ return (
+
+
+ Content
+
+
+ )
+}
+```
+
+**Correct: native content inset adjustment**
+
+```tsx
+import { ScrollView, View, Text } from 'react-native'
+
+function MyScreen() {
+ return (
+
+
+ Content
+
+
+ )
+}
+```
+
+The native approach handles dynamic safe areas (keyboard, toolbars) and allows content to scroll behind the status bar naturally.
+
+### 9.5 Use expo-image for Optimized Images
+
+**Impact: HIGH (memory efficiency, caching, blurhash placeholders, progressive loading)**
+
+Use `expo-image` instead of React Native's `Image`. It provides memory-efficient caching, blurhash placeholders, progressive loading, and better performance for lists.
+
+**Incorrect: React Native Image**
+
+```tsx
+import { Image } from 'react-native'
+
+function Avatar({ url }: { url: string }) {
+ return
+}
+```
+
+**Correct: expo-image**
+
+```tsx
+import { Image } from 'expo-image'
+
+function Avatar({ url }: { url: string }) {
+ return
+}
+```
+
+**With blurhash placeholder:**
+
+```tsx
+
+```
+
+**With priority and caching:**
+
+```tsx
+
+```
+
+**Key props:**
+
+- `placeholder` — Blurhash or thumbnail while loading
+
+- `contentFit` — `cover`, `contain`, `fill`, `scale-down`
+
+- `transition` — Fade-in duration (ms)
+
+- `priority` — `low`, `normal`, `high`
+
+- `cachePolicy` — `memory`, `disk`, `memory-disk`, `none`
+
+- `recyclingKey` — Unique key for list recycling
+
+For cross-platform (web + native), use `SolitoImage` from `solito/image` which uses `expo-image` under the hood.
+
+Reference: [https://docs.expo.dev/versions/latest/sdk/image/](https://docs.expo.dev/versions/latest/sdk/image/)
+
+### 9.6 Use Galeria for Image Galleries and Lightbox
+
+**Impact: MEDIUM**
+
+For image galleries with lightbox (tap to fullscreen), use `@nandorojo/galeria`.
+
+It provides native shared element transitions with pinch-to-zoom, double-tap
+
+zoom, and pan-to-close. Works with any image component including `expo-image`.
+
+**Incorrect: custom modal implementation**
+
+```tsx
+function ImageGallery({ urls }: { urls: string[] }) {
+ const [selected, setSelected] = useState(null)
+
+ return (
+ <>
+ {urls.map((url) => (
+ setSelected(url)}>
+
+
+ ))}
+ setSelected(null)}>
+
+
+
+ )
+}
+```
+
+**Correct: Galeria with expo-image**
+
+```tsx
+import { Galeria } from '@nandorojo/galeria'
+import { Image } from 'expo-image'
+
+function ImageGallery({ urls }: { urls: string[] }) {
+ return (
+
+ {urls.map((url, index) => (
+
+
+
+ ))}
+
+ )
+}
+```
+
+**Single image:**
+
+```tsx
+import { Galeria } from '@nandorojo/galeria'
+import { Image } from 'expo-image'
+
+function Avatar({ url }: { url: string }) {
+ return (
+
+
+
+
+
+ )
+}
+```
+
+**With low-res thumbnails and high-res fullscreen:**
+
+```tsx
+
+ {lowResUrls.map((url, index) => (
+
+
+
+ ))}
+
+```
+
+**With FlashList:**
+
+```tsx
+
+ (
+
+
+
+ )}
+ numColumns={3}
+ estimatedItemSize={100}
+ />
+
+```
+
+Works with `expo-image`, `SolitoImage`, `react-native` Image, or any image
+
+component.
+
+Reference: [https://github.com/nandorojo/galeria](https://github.com/nandorojo/galeria)
+
+### 9.7 Use Native Menus for Dropdowns and Context Menus
+
+**Impact: HIGH (native accessibility, platform-consistent UX)**
+
+Use native platform menus instead of custom JS implementations. Native menus
+
+provide built-in accessibility, consistent platform UX, and better performance.
+
+Use [zeego](https://zeego.dev) for cross-platform native menus.
+
+**Incorrect: custom JS menu**
+
+```tsx
+import { useState } from 'react'
+import { View, Pressable, Text } from 'react-native'
+
+function MyMenu() {
+ const [open, setOpen] = useState(false)
+
+ return (
+
+ setOpen(!open)}>
+ Open Menu
+
+ {open && (
+
+ console.log('edit')}>
+ Edit
+
+ console.log('delete')}>
+ Delete
+
+
+ )}
+
+ )
+}
+```
+
+**Correct: native menu with zeego**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function MyMenu() {
+ return (
+
+
+
+ Open Menu
+
+
+
+
+ console.log('edit')}>
+ Edit
+
+
+ console.log('delete')}
+ >
+ Delete
+
+
+
+ )
+}
+```
+
+**Context menu: long-press**
+
+```tsx
+import * as ContextMenu from 'zeego/context-menu'
+
+function MyContextMenu() {
+ return (
+
+
+
+ Long press me
+
+
+
+
+ console.log('copy')}>
+ Copy
+
+
+ console.log('paste')}>
+ Paste
+
+
+
+ )
+}
+```
+
+**Checkbox items:**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function SettingsMenu() {
+ const [notifications, setNotifications] = useState(true)
+
+ return (
+
+
+
+ Settings
+
+
+
+
+ setNotifications((prev) => !prev)}
+ >
+
+ Notifications
+
+
+
+ )
+}
+```
+
+**Submenus:**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function MenuWithSubmenu() {
+ return (
+
+
+
+ Options
+
+
+
+
+ console.log('home')}>
+ Home
+
+
+
+
+ More Options
+
+
+
+
+ Settings
+
+
+
+ Help
+
+
+
+
+
+ )
+}
+```
+
+Reference: [https://zeego.dev/components/dropdown-menu](https://zeego.dev/components/dropdown-menu)
+
+### 9.8 Use Native Modals Over JS-Based Bottom Sheets
+
+**Impact: HIGH (native performance, gestures, accessibility)**
+
+Use native `` with `presentationStyle="formSheet"` or React Navigation
+
+v7's native form sheet instead of JS-based bottom sheet libraries. Native modals
+
+have built-in gestures, accessibility, and better performance. Rely on native UI
+
+for low-level primitives.
+
+**Incorrect: JS-based bottom sheet**
+
+```tsx
+import BottomSheet from 'custom-js-bottom-sheet'
+
+function MyScreen() {
+ const sheetRef = useRef(null)
+
+ return (
+
+
+ )
+}
+```
+
+**Correct: native Modal with formSheet**
+
+```tsx
+import { Modal, View, Text, Button } from 'react-native'
+
+function MyScreen() {
+ const [visible, setVisible] = useState(false)
+
+ return (
+
+
+ )
+}
+```
+
+**Correct: React Navigation v7 native form sheet**
+
+```tsx
+// In your navigator
+
+```
+
+Native modals provide swipe-to-dismiss, proper keyboard avoidance, and
+
+accessibility out of the box.
+
+### 9.9 Use Pressable Instead of Touchable Components
+
+**Impact: LOW (modern API, more flexible)**
+
+Never use `TouchableOpacity` or `TouchableHighlight`. Use `Pressable` from
+
+`react-native` or `react-native-gesture-handler` instead.
+
+**Incorrect: legacy Touchable components**
+
+```tsx
+import { TouchableOpacity } from 'react-native'
+
+function MyButton({ onPress }: { onPress: () => void }) {
+ return (
+
+ Press me
+
+ )
+}
+```
+
+**Correct: Pressable**
+
+```tsx
+import { Pressable } from 'react-native'
+
+function MyButton({ onPress }: { onPress: () => void }) {
+ return (
+
+ Press me
+
+ )
+}
+```
+
+**Correct: Pressable from gesture handler for lists**
+
+```tsx
+import { Pressable } from 'react-native-gesture-handler'
+
+function ListItem({ onPress }: { onPress: () => void }) {
+ return (
+
+ Item
+
+ )
+}
+```
+
+Use `react-native-gesture-handler` Pressable inside scrollable lists for better
+
+gesture coordination, as long as you are using the ScrollView from
+
+`react-native-gesture-handler` as well.
+
+**For animated press states (scale, opacity changes):** Use `GestureDetector`
+
+with Reanimated shared values instead of Pressable's style callback. See the
+
+`animation-gesture-detector-press` rule.
+
+---
+
+## 10. Design System
+
+**Impact: MEDIUM**
+
+Architecture patterns for building maintainable component
+libraries.
+
+### 10.1 Use Compound Components Over Polymorphic Children
+
+**Impact: MEDIUM (flexible composition, clearer API)**
+
+Don't create components that can accept a string if they aren't a text node. If
+
+a component can receive a string child, it must be a dedicated `*Text`
+
+component. For components like buttons, which can have both a View (or
+
+Pressable) together with text, use compound components, such a `Button`,
+
+`ButtonText`, and `ButtonIcon`.
+
+**Incorrect: polymorphic children**
+
+```tsx
+import { Pressable, Text } from 'react-native'
+
+type ButtonProps = {
+ children: string | React.ReactNode
+ icon?: React.ReactNode
+}
+
+function Button({ children, icon }: ButtonProps) {
+ return (
+
+ {icon}
+ {typeof children === 'string' ? {children} : children}
+
+ )
+}
+
+// Usage is ambiguous
+}>Save
+
+```
+
+**Correct: compound components**
+
+```tsx
+import { Pressable, Text } from 'react-native'
+
+function Button({ children }: { children: React.ReactNode }) {
+ return {children}
+}
+
+function ButtonText({ children }: { children: React.ReactNode }) {
+ return {children}
+}
+
+function ButtonIcon({ children }: { children: React.ReactNode }) {
+ return <>{children}
+}
+
+// Usage is explicit and composable
+
+
+
+```
+
+---
+
+## 11. Monorepo
+
+**Impact: LOW**
+
+Dependency management and native module configuration in
+monorepos.
+
+### 11.1 Install Native Dependencies in App Directory
+
+**Impact: CRITICAL (required for autolinking to work)**
+
+In a monorepo, packages with native code must be installed in the native app's
+
+directory directly. Autolinking only scans the app's `node_modules`—it won't
+
+find native dependencies installed in other packages.
+
+**Incorrect: native dep in shared package only**
+
+```typescript
+packages/
+ ui/
+ package.json # has react-native-reanimated
+ app/
+ package.json # missing react-native-reanimated
+```
+
+Autolinking fails—native code not linked.
+
+**Correct: native dep in app directory**
+
+```json
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+```
+
+Even if the shared package uses the native dependency, the app must also list it
+
+for autolinking to detect and link the native code.
+
+### 11.2 Use Single Dependency Versions Across Monorepo
+
+**Impact: MEDIUM (avoids duplicate bundles, version conflicts)**
+
+Use a single version of each dependency across all packages in your monorepo.
+
+Prefer exact versions over ranges. Multiple versions cause duplicate code in
+
+bundles, runtime conflicts, and inconsistent behavior across packages.
+
+Use a tool like syncpack to enforce this. As a last resort, use yarn resolutions
+
+or npm overrides.
+
+**Incorrect: version ranges, multiple versions**
+
+```json
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "^3.0.0"
+ }
+}
+
+// packages/ui/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "^3.5.0"
+ }
+}
+```
+
+**Correct: exact versions, single source of truth**
+
+```json
+// package.json (root)
+{
+ "pnpm": {
+ "overrides": {
+ "react-native-reanimated": "3.16.1"
+ }
+ }
+}
+
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+
+// packages/ui/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+```
+
+Use your package manager's override/resolution feature to enforce versions at
+
+the root. When adding dependencies, specify exact versions without `^` or `~`.
+
+---
+
+## 12. Third-Party Dependencies
+
+**Impact: LOW**
+
+Wrapping and re-exporting third-party dependencies for
+maintainability.
+
+### 12.1 Import from Design System Folder
+
+**Impact: LOW (enables global changes and easy refactoring)**
+
+Re-export dependencies from a design system folder. App code imports from there,
+
+not directly from packages. This enables global changes and easy refactoring.
+
+**Incorrect: imports directly from package**
+
+```tsx
+import { View, Text } from 'react-native'
+import { Button } from '@ui/button'
+
+function Profile() {
+ return (
+
+ Hello
+
+
+ )
+}
+```
+
+**Correct: imports from design system**
+
+```tsx
+import { View } from '@/components/view'
+import { Text } from '@/components/text'
+import { Button } from '@/components/button'
+
+function Profile() {
+ return (
+
+ Hello
+
+
+ )
+}
+```
+
+Start by simply re-exporting. Customize later without changing app code.
+
+---
+
+## 13. JavaScript
+
+**Impact: LOW**
+
+Micro-optimizations like hoisting expensive object creation.
+
+### 13.1 Hoist Intl Formatter Creation
+
+**Impact: LOW-MEDIUM (avoids expensive object recreation)**
+
+Don't create `Intl.DateTimeFormat`, `Intl.NumberFormat`, or
+
+`Intl.RelativeTimeFormat` inside render or loops. These are expensive to
+
+instantiate. Hoist to module scope when the locale/options are static.
+
+**Incorrect: new formatter every render**
+
+```tsx
+function Price({ amount }: { amount: number }) {
+ const formatter = new Intl.NumberFormat('en-US', {
+ style: 'currency',
+ currency: 'USD',
+ })
+ return {formatter.format(amount)}
+}
+```
+
+**Correct: hoisted to module scope**
+
+```tsx
+const currencyFormatter = new Intl.NumberFormat('en-US', {
+ style: 'currency',
+ currency: 'USD',
+})
+
+function Price({ amount }: { amount: number }) {
+ return {currencyFormatter.format(amount)}
+}
+```
+
+**For dynamic locales, memoize:**
+
+```tsx
+const dateFormatter = useMemo(
+ () => new Intl.DateTimeFormat(locale, { dateStyle: 'medium' }),
+ [locale]
+)
+```
+
+**Common formatters to hoist:**
+
+```tsx
+// Module-level formatters
+const dateFormatter = new Intl.DateTimeFormat('en-US', { dateStyle: 'medium' })
+const timeFormatter = new Intl.DateTimeFormat('en-US', { timeStyle: 'short' })
+const percentFormatter = new Intl.NumberFormat('en-US', { style: 'percent' })
+const relativeFormatter = new Intl.RelativeTimeFormat('en-US', {
+ numeric: 'auto',
+})
+```
+
+Creating `Intl` objects is significantly more expensive than `RegExp` or plain
+
+objects—each instantiation parses locale data and builds internal lookup tables.
+
+---
+
+## 14. Fonts
+
+**Impact: LOW**
+
+Native font loading for improved performance.
+
+### 14.1 Load fonts natively at build time
+
+**Impact: LOW (fonts available at launch, no async loading)**
+
+Use the `expo-font` config plugin to embed fonts at build time instead of
+
+`useFonts` or `Font.loadAsync`. Embedded fonts are more efficient.
+
+[Expo Font Documentation](https://docs.expo.dev/versions/latest/sdk/font/)
+
+**Incorrect: async font loading**
+
+```tsx
+import { useFonts } from 'expo-font'
+import { Text, View } from 'react-native'
+
+function App() {
+ const [fontsLoaded] = useFonts({
+ 'Geist-Bold': require('./assets/fonts/Geist-Bold.otf'),
+ })
+
+ if (!fontsLoaded) {
+ return null
+ }
+
+ return (
+
+ Hello
+
+ )
+}
+```
+
+**Correct: config plugin, fonts embedded at build**
+
+```tsx
+import { Text, View } from 'react-native'
+
+function App() {
+ // No loading state needed—font is already available
+ return (
+
+ Hello
+
+ )
+}
+```
+
+After adding fonts to the config plugin, run `npx expo prebuild` and rebuild the
+
+native app.
+
+---
+
+## References
+
+1. [https://react.dev](https://react.dev)
+2. [https://reactnative.dev](https://reactnative.dev)
+3. [https://docs.swmansion.com/react-native-reanimated](https://docs.swmansion.com/react-native-reanimated)
+4. [https://docs.swmansion.com/react-native-gesture-handler](https://docs.swmansion.com/react-native-gesture-handler)
+5. [https://docs.expo.dev](https://docs.expo.dev)
+6. [https://legendapp.com/open-source/legend-list](https://legendapp.com/open-source/legend-list)
+7. [https://github.com/nandorojo/galeria](https://github.com/nandorojo/galeria)
+8. [https://zeego.dev](https://zeego.dev)
diff --git a/.agents/skills/vercel-react-native-skills/SKILL.md b/.agents/skills/vercel-react-native-skills/SKILL.md
new file mode 100644
index 000000000000..73401865dd74
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/SKILL.md
@@ -0,0 +1,121 @@
+---
+name: vercel-react-native-skills
+description:
+ React Native and Expo best practices for building performant mobile apps. Use
+ when building React Native components, optimizing list performance,
+ implementing animations, or working with native modules. Triggers on tasks
+ involving React Native, Expo, mobile performance, or native platform APIs.
+license: MIT
+metadata:
+ author: vercel
+ version: '1.0.0'
+---
+
+# React Native Skills
+
+Comprehensive best practices for React Native and Expo applications. Contains
+rules across multiple categories covering performance, animations, UI patterns,
+and platform-specific optimizations.
+
+## When to Apply
+
+Reference these guidelines when:
+
+- Building React Native or Expo apps
+- Optimizing list and scroll performance
+- Implementing animations with Reanimated
+- Working with images and media
+- Configuring native modules or fonts
+- Structuring monorepo projects with native dependencies
+
+## Rule Categories by Priority
+
+| Priority | Category | Impact | Prefix |
+| -------- | ---------------- | -------- | -------------------- |
+| 1 | List Performance | CRITICAL | `list-performance-` |
+| 2 | Animation | HIGH | `animation-` |
+| 3 | Navigation | HIGH | `navigation-` |
+| 4 | UI Patterns | HIGH | `ui-` |
+| 5 | State Management | MEDIUM | `react-state-` |
+| 6 | Rendering | MEDIUM | `rendering-` |
+| 7 | Monorepo | MEDIUM | `monorepo-` |
+| 8 | Configuration | LOW | `fonts-`, `imports-` |
+
+## Quick Reference
+
+### 1. List Performance (CRITICAL)
+
+- `list-performance-virtualize` - Use FlashList for large lists
+- `list-performance-item-memo` - Memoize list item components
+- `list-performance-callbacks` - Stabilize callback references
+- `list-performance-inline-objects` - Avoid inline style objects
+- `list-performance-function-references` - Extract functions outside render
+- `list-performance-images` - Optimize images in lists
+- `list-performance-item-expensive` - Move expensive work outside items
+- `list-performance-item-types` - Use item types for heterogeneous lists
+
+### 2. Animation (HIGH)
+
+- `animation-gpu-properties` - Animate only transform and opacity
+- `animation-derived-value` - Use useDerivedValue for computed animations
+- `animation-gesture-detector-press` - Use Gesture.Tap instead of Pressable
+
+### 3. Navigation (HIGH)
+
+- `navigation-native-navigators` - Use native stack and native tabs over JS navigators
+
+### 4. UI Patterns (HIGH)
+
+- `ui-expo-image` - Use expo-image for all images
+- `ui-image-gallery` - Use Galeria for image lightboxes
+- `ui-pressable` - Use Pressable over TouchableOpacity
+- `ui-safe-area-scroll` - Handle safe areas in ScrollViews
+- `ui-scrollview-content-inset` - Use contentInset for headers
+- `ui-menus` - Use native context menus
+- `ui-native-modals` - Use native modals when possible
+- `ui-measure-views` - Use onLayout, not measure()
+- `ui-styling` - Use StyleSheet.create or Nativewind
+
+### 5. State Management (MEDIUM)
+
+- `react-state-minimize` - Minimize state subscriptions
+- `react-state-dispatcher` - Use dispatcher pattern for callbacks
+- `react-state-fallback` - Show fallback on first render
+- `react-compiler-destructure-functions` - Destructure for React Compiler
+- `react-compiler-reanimated-shared-values` - Handle shared values with compiler
+
+### 6. Rendering (MEDIUM)
+
+- `rendering-text-in-text-component` - Wrap text in Text components
+- `rendering-no-falsy-and` - Avoid falsy && for conditional rendering
+
+### 7. Monorepo (MEDIUM)
+
+- `monorepo-native-deps-in-app` - Keep native dependencies in app package
+- `monorepo-single-dependency-versions` - Use single versions across packages
+
+### 8. Configuration (LOW)
+
+- `fonts-config-plugin` - Use config plugins for custom fonts
+- `imports-design-system-folder` - Organize design system imports
+- `js-hoist-intl` - Hoist Intl object creation
+
+## How to Use
+
+Read individual rule files for detailed explanations and code examples:
+
+```
+rules/list-performance-virtualize.md
+rules/animation-gpu-properties.md
+```
+
+Each rule file contains:
+
+- Brief explanation of why it matters
+- Incorrect code example with explanation
+- Correct code example with explanation
+- Additional context and references
+
+## Full Compiled Document
+
+For the complete guide with all rules expanded: `AGENTS.md`
diff --git a/.agents/skills/vercel-react-native-skills/rules/animation-derived-value.md b/.agents/skills/vercel-react-native-skills/rules/animation-derived-value.md
new file mode 100644
index 000000000000..310928a957b8
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/animation-derived-value.md
@@ -0,0 +1,53 @@
+---
+title: Prefer useDerivedValue Over useAnimatedReaction
+impact: MEDIUM
+impactDescription: cleaner code, automatic dependency tracking
+tags: animation, reanimated, derived-value
+---
+
+## Prefer useDerivedValue Over useAnimatedReaction
+
+When deriving a shared value from another, use `useDerivedValue` instead of
+`useAnimatedReaction`. Derived values are declarative, automatically track
+dependencies, and return a value you can use directly. Animated reactions are
+for side effects, not derivations.
+
+**Incorrect (useAnimatedReaction for derivation):**
+
+```tsx
+import { useSharedValue, useAnimatedReaction } from 'react-native-reanimated'
+
+function MyComponent() {
+ const progress = useSharedValue(0)
+ const opacity = useSharedValue(1)
+
+ useAnimatedReaction(
+ () => progress.value,
+ (current) => {
+ opacity.value = 1 - current
+ }
+ )
+
+ // ...
+}
+```
+
+**Correct (useDerivedValue):**
+
+```tsx
+import { useSharedValue, useDerivedValue } from 'react-native-reanimated'
+
+function MyComponent() {
+ const progress = useSharedValue(0)
+
+ const opacity = useDerivedValue(() => 1 - progress.get())
+
+ // ...
+}
+```
+
+Use `useAnimatedReaction` only for side effects that don't produce a value
+(e.g., triggering haptics, logging, calling `runOnJS`).
+
+Reference:
+[Reanimated useDerivedValue](https://docs.swmansion.com/react-native-reanimated/docs/core/useDerivedValue)
diff --git a/.agents/skills/vercel-react-native-skills/rules/animation-gesture-detector-press.md b/.agents/skills/vercel-react-native-skills/rules/animation-gesture-detector-press.md
new file mode 100644
index 000000000000..87c67827054b
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/animation-gesture-detector-press.md
@@ -0,0 +1,95 @@
+---
+title: Use GestureDetector for Animated Press States
+impact: MEDIUM
+impactDescription: UI thread animations, smoother press feedback
+tags: animation, gestures, press, reanimated
+---
+
+## Use GestureDetector for Animated Press States
+
+For animated press states (scale, opacity on press), use `GestureDetector` with
+`Gesture.Tap()` and shared values instead of Pressable's
+`onPressIn`/`onPressOut`. Gesture callbacks run on the UI thread as worklets—no
+JS thread round-trip for press animations.
+
+**Incorrect (Pressable with JS thread callbacks):**
+
+```tsx
+import { Pressable } from 'react-native'
+import Animated, {
+ useSharedValue,
+ useAnimatedStyle,
+ withTiming,
+} from 'react-native-reanimated'
+
+function AnimatedButton({ onPress }: { onPress: () => void }) {
+ const scale = useSharedValue(1)
+
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: scale.value }],
+ }))
+
+ return (
+ (scale.value = withTiming(0.95))}
+ onPressOut={() => (scale.value = withTiming(1))}
+ >
+
+ Press me
+
+
+ )
+}
+```
+
+**Correct (GestureDetector with UI thread worklets):**
+
+```tsx
+import { Gesture, GestureDetector } from 'react-native-gesture-handler'
+import Animated, {
+ useSharedValue,
+ useAnimatedStyle,
+ withTiming,
+ interpolate,
+ runOnJS,
+} from 'react-native-reanimated'
+
+function AnimatedButton({ onPress }: { onPress: () => void }) {
+ // Store the press STATE (0 = not pressed, 1 = pressed)
+ const pressed = useSharedValue(0)
+
+ const tap = Gesture.Tap()
+ .onBegin(() => {
+ pressed.set(withTiming(1))
+ })
+ .onFinalize(() => {
+ pressed.set(withTiming(0))
+ })
+ .onEnd(() => {
+ runOnJS(onPress)()
+ })
+
+ // Derive visual values from the state
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { scale: interpolate(withTiming(pressed.get()), [0, 1], [1, 0.95]) },
+ ],
+ }))
+
+ return (
+
+
+ Press me
+
+
+ )
+}
+```
+
+Store the press **state** (0 or 1), then derive the scale via `interpolate`.
+This keeps the shared value as ground truth. Use `runOnJS` to call JS functions
+from worklets. Use `.set()` and `.get()` for React Compiler compatibility.
+
+Reference:
+[Gesture Handler Tap Gesture](https://docs.swmansion.com/react-native-gesture-handler/docs/gestures/tap-gesture)
diff --git a/.agents/skills/vercel-react-native-skills/rules/animation-gpu-properties.md b/.agents/skills/vercel-react-native-skills/rules/animation-gpu-properties.md
new file mode 100644
index 000000000000..5fda09558e89
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/animation-gpu-properties.md
@@ -0,0 +1,65 @@
+---
+title: Animate Transform and Opacity Instead of Layout Properties
+impact: HIGH
+impactDescription: GPU-accelerated animations, no layout recalculation
+tags: animation, performance, reanimated, transform, opacity
+---
+
+## Animate Transform and Opacity Instead of Layout Properties
+
+Avoid animating `width`, `height`, `top`, `left`, `margin`, or `padding`. These trigger layout recalculation on every frame. Instead, use `transform` (scale, translate) and `opacity` which run on the GPU without triggering layout.
+
+**Incorrect (animates height, triggers layout every frame):**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function CollapsiblePanel({ expanded }: { expanded: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ height: withTiming(expanded ? 200 : 0), // triggers layout on every frame
+ overflow: 'hidden',
+ }))
+
+ return {children}
+}
+```
+
+**Correct (animates scaleY, GPU-accelerated):**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function CollapsiblePanel({ expanded }: { expanded: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { scaleY: withTiming(expanded ? 1 : 0) },
+ ],
+ opacity: withTiming(expanded ? 1 : 0),
+ }))
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**Correct (animates translateY for slide animations):**
+
+```tsx
+import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated'
+
+function SlideIn({ visible }: { visible: boolean }) {
+ const animatedStyle = useAnimatedStyle(() => ({
+ transform: [
+ { translateY: withTiming(visible ? 0 : 100) },
+ ],
+ opacity: withTiming(visible ? 1 : 0),
+ }))
+
+ return {children}
+}
+```
+
+GPU-accelerated properties: `transform` (translate, scale, rotate), `opacity`. Everything else triggers layout.
diff --git a/.agents/skills/vercel-react-native-skills/rules/design-system-compound-components.md b/.agents/skills/vercel-react-native-skills/rules/design-system-compound-components.md
new file mode 100644
index 000000000000..d8239ee1fbb9
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/design-system-compound-components.md
@@ -0,0 +1,66 @@
+---
+title: Use Compound Components Over Polymorphic Children
+impact: MEDIUM
+impactDescription: flexible composition, clearer API
+tags: design-system, components, composition
+---
+
+## Use Compound Components Over Polymorphic Children
+
+Don't create components that can accept a string if they aren't a text node. If
+a component can receive a string child, it must be a dedicated `*Text`
+component. For components like buttons, which can have both a View (or
+Pressable) together with text, use compound components, such a `Button`,
+`ButtonText`, and `ButtonIcon`.
+
+**Incorrect (polymorphic children):**
+
+```tsx
+import { Pressable, Text } from 'react-native'
+
+type ButtonProps = {
+ children: string | React.ReactNode
+ icon?: React.ReactNode
+}
+
+function Button({ children, icon }: ButtonProps) {
+ return (
+
+ {icon}
+ {typeof children === 'string' ? {children} : children}
+
+ )
+}
+
+// Usage is ambiguous
+}>Save
+
+```
+
+**Correct (compound components):**
+
+```tsx
+import { Pressable, Text } from 'react-native'
+
+function Button({ children }: { children: React.ReactNode }) {
+ return {children}
+}
+
+function ButtonText({ children }: { children: React.ReactNode }) {
+ return {children}
+}
+
+function ButtonIcon({ children }: { children: React.ReactNode }) {
+ return <>{children}
+}
+
+// Usage is explicit and composable
+
+
+
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/fonts-config-plugin.md b/.agents/skills/vercel-react-native-skills/rules/fonts-config-plugin.md
new file mode 100644
index 000000000000..39aa01477af6
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/fonts-config-plugin.md
@@ -0,0 +1,71 @@
+---
+title: Load fonts natively at build time
+impact: LOW
+impactDescription: fonts available at launch, no async loading
+tags: fonts, expo, performance, config-plugin
+---
+
+## Use Expo Config Plugin for Font Loading
+
+Use the `expo-font` config plugin to embed fonts at build time instead of
+`useFonts` or `Font.loadAsync`. Embedded fonts are more efficient.
+
+**Incorrect (async font loading):**
+
+```tsx
+import { useFonts } from 'expo-font'
+import { Text, View } from 'react-native'
+
+function App() {
+ const [fontsLoaded] = useFonts({
+ 'Geist-Bold': require('./assets/fonts/Geist-Bold.otf'),
+ })
+
+ if (!fontsLoaded) {
+ return null
+ }
+
+ return (
+
+ Hello
+
+ )
+}
+```
+
+**Correct (config plugin, fonts embedded at build):**
+
+```json
+// app.json
+{
+ "expo": {
+ "plugins": [
+ [
+ "expo-font",
+ {
+ "fonts": ["./assets/fonts/Geist-Bold.otf"]
+ }
+ ]
+ ]
+ }
+}
+```
+
+```tsx
+import { Text, View } from 'react-native'
+
+function App() {
+ // No loading state needed—font is already available
+ return (
+
+ Hello
+
+ )
+}
+```
+
+After adding fonts to the config plugin, run `npx expo prebuild` and rebuild the
+native app.
+
+Reference:
+[Expo Font Documentation](https://docs.expo.dev/versions/latest/sdk/font/)
diff --git a/.agents/skills/vercel-react-native-skills/rules/imports-design-system-folder.md b/.agents/skills/vercel-react-native-skills/rules/imports-design-system-folder.md
new file mode 100644
index 000000000000..8466dcb2544d
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/imports-design-system-folder.md
@@ -0,0 +1,68 @@
+---
+title: Import from Design System Folder
+impact: LOW
+impactDescription: enables global changes and easy refactoring
+tags: imports, architecture, design-system
+---
+
+## Import from Design System Folder
+
+Re-export dependencies from a design system folder. App code imports from there,
+not directly from packages. This enables global changes and easy refactoring.
+
+**Incorrect (imports directly from package):**
+
+```tsx
+import { View, Text } from 'react-native'
+import { Button } from '@ui/button'
+
+function Profile() {
+ return (
+
+ Hello
+
+
+ )
+}
+```
+
+**Correct (imports from design system):**
+
+```tsx
+// components/view.tsx
+import { View as RNView } from 'react-native'
+
+// ideal: pick the props you will actually use to control implementation
+export function View(
+ props: Pick, 'style' | 'children'>
+) {
+ return
+}
+```
+
+```tsx
+// components/text.tsx
+export { Text } from 'react-native'
+```
+
+```tsx
+// components/button.tsx
+export { Button } from '@ui/button'
+```
+
+```tsx
+import { View } from '@/components/view'
+import { Text } from '@/components/text'
+import { Button } from '@/components/button'
+
+function Profile() {
+ return (
+
+ Hello
+
+
+ )
+}
+```
+
+Start by simply re-exporting. Customize later without changing app code.
diff --git a/.agents/skills/vercel-react-native-skills/rules/js-hoist-intl.md b/.agents/skills/vercel-react-native-skills/rules/js-hoist-intl.md
new file mode 100644
index 000000000000..9af1c354c3e5
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/js-hoist-intl.md
@@ -0,0 +1,61 @@
+---
+title: Hoist Intl Formatter Creation
+impact: LOW-MEDIUM
+impactDescription: avoids expensive object recreation
+tags: javascript, intl, optimization, memoization
+---
+
+## Hoist Intl Formatter Creation
+
+Don't create `Intl.DateTimeFormat`, `Intl.NumberFormat`, or
+`Intl.RelativeTimeFormat` inside render or loops. These are expensive to
+instantiate. Hoist to module scope when the locale/options are static.
+
+**Incorrect (new formatter every render):**
+
+```tsx
+function Price({ amount }: { amount: number }) {
+ const formatter = new Intl.NumberFormat('en-US', {
+ style: 'currency',
+ currency: 'USD',
+ })
+ return {formatter.format(amount)}
+}
+```
+
+**Correct (hoisted to module scope):**
+
+```tsx
+const currencyFormatter = new Intl.NumberFormat('en-US', {
+ style: 'currency',
+ currency: 'USD',
+})
+
+function Price({ amount }: { amount: number }) {
+ return {currencyFormatter.format(amount)}
+}
+```
+
+**For dynamic locales, memoize:**
+
+```tsx
+const dateFormatter = useMemo(
+ () => new Intl.DateTimeFormat(locale, { dateStyle: 'medium' }),
+ [locale]
+)
+```
+
+**Common formatters to hoist:**
+
+```tsx
+// Module-level formatters
+const dateFormatter = new Intl.DateTimeFormat('en-US', { dateStyle: 'medium' })
+const timeFormatter = new Intl.DateTimeFormat('en-US', { timeStyle: 'short' })
+const percentFormatter = new Intl.NumberFormat('en-US', { style: 'percent' })
+const relativeFormatter = new Intl.RelativeTimeFormat('en-US', {
+ numeric: 'auto',
+})
+```
+
+Creating `Intl` objects is significantly more expensive than `RegExp` or plain
+objects—each instantiation parses locale data and builds internal lookup tables.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-callbacks.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-callbacks.md
new file mode 100644
index 000000000000..a0b3913ff3b8
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-callbacks.md
@@ -0,0 +1,44 @@
+---
+title: Hoist callbacks to the root of lists
+impact: MEDIUM
+impactDescription: Fewer re-renders and faster lists
+tags: tag1, tag2
+---
+
+## List performance callbacks
+
+**Impact: HIGH (Fewer re-renders and faster lists)**
+
+When passing callback functions to list items, create a single instance of the
+callback at the root of the list. Items should then call it with a unique
+identifier.
+
+**Incorrect (creates a new callback on each render):**
+
+```typescript
+return (
+ {
+ // bad: creates a new callback on each render
+ const onPress = () => handlePress(item.id)
+ return
+ }}
+ />
+)
+```
+
+**Correct (a single function instance passed to each item):**
+
+```typescript
+const onPress = useCallback(() => handlePress(item.id), [handlePress, item.id])
+
+return (
+ (
+
+ )}
+ />
+)
+```
+
+Reference: [Link to documentation or resource](https://example.com)
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-function-references.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-function-references.md
new file mode 100644
index 000000000000..9721929b28b8
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-function-references.md
@@ -0,0 +1,132 @@
+---
+title: Optimize List Performance with Stable Object References
+impact: CRITICAL
+impactDescription: virtualization relies on reference stability
+tags: lists, performance, flatlist, virtualization
+---
+
+## Optimize List Performance with Stable Object References
+
+Don't map or filter data before passing to virtualized lists. Virtualization
+relies on object reference stability to know what changed—new references cause
+full re-renders of all visible items. Attempt to prevent frequent renders at the
+list-parent level.
+
+Where needed, use context selectors within list items.
+
+**Incorrect (creates new object references on every keystroke):**
+
+```tsx
+function DomainSearch() {
+ const { keyword, setKeyword } = useKeywordZustandState()
+ const { data: tlds } = useTlds()
+
+ // Bad: creates new objects on every render, reparenting the entire list on every keystroke
+ const domains = tlds.map((tld) => ({
+ domain: `${keyword}.${tld.name}`,
+ tld: tld.name,
+ price: tld.price,
+ }))
+
+ return (
+ <>
+
+ }
+ />
+
+ )
+}
+```
+
+**Correct (stable references, transform inside items):**
+
+```tsx
+const renderItem = ({ item }) =>
+
+function DomainSearch() {
+ const { data: tlds } = useTlds()
+
+ return (
+
+ )
+}
+
+function DomainItem({ tld }: { tld: Tld }) {
+ // good: transform within items, and don't pass the dynamic data as a prop
+ // good: use a selector function from zustand to receive a stable string back
+ const domain = useKeywordZustandState((s) => s.keyword + '.' + tld.name)
+ return {domain}
+}
+```
+
+**Updating parent array reference:**
+
+Creating a new array instance can be okay, as long as its inner object
+references are stable. For instance, if you sort a list of objects:
+
+```tsx
+// good: creates a new array instance without mutating the inner objects
+// good: parent array reference is unaffected by typing and updating "keyword"
+const sortedTlds = tlds.toSorted((a, b) => a.name.localeCompare(b.name))
+
+return
+```
+
+Even though this creates a new array instance `sortedTlds`, the inner object
+references are stable.
+
+**With zustand for dynamic data (avoids parent re-renders):**
+
+```tsx
+const useSearchStore = create<{ keyword: string }>(() => ({ keyword: '' }))
+
+function DomainSearch() {
+ const { data: tlds } = useTlds()
+
+ return (
+ <>
+
+ }
+ />
+
+ )
+}
+
+function DomainItem({ tld }: { tld: Tld }) {
+ // Select only what you need—component only re-renders when keyword changes
+ const keyword = useSearchStore((s) => s.keyword)
+ const domain = `${keyword}.${tld.name}`
+ return {domain}
+}
+```
+
+Virtualization can now skip items that haven't changed when typing. Only visible
+items (~20) re-render on keystroke, rather than the parent.
+
+**Deriving state within list items based on parent data (avoids parent
+re-renders):**
+
+For components where the data is conditional based on the parent state, this
+pattern is even more important. For example, if you are checking if an item is
+favorited, toggling favorites only re-renders one component if the item itself
+is in charge of accessing the state rather than the parent:
+
+```tsx
+function DomainItemFavoriteButton({ tld }: { tld: Tld }) {
+ const isFavorited = useFavoritesStore((s) => s.favorites.has(tld.id))
+ return
+}
+```
+
+Note: if you're using the React Compiler, you can read React Context values
+directly within list items. Although this is slightly slower than using a
+Zustand selector in most cases, the effect may be negligible.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-images.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-images.md
new file mode 100644
index 000000000000..75a3bafc83f6
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-images.md
@@ -0,0 +1,53 @@
+---
+title: Use Compressed Images in Lists
+impact: HIGH
+impactDescription: faster load times, less memory
+tags: lists, images, performance, optimization
+---
+
+## Use Compressed Images in Lists
+
+Always load compressed, appropriately-sized images in lists. Full-resolution
+images consume excessive memory and cause scroll jank. Request thumbnails from
+your server or use an image CDN with resize parameters.
+
+**Incorrect (full-resolution images):**
+
+```tsx
+function ProductItem({ product }: { product: Product }) {
+ return (
+
+ {/* 4000x3000 image loaded for a 100x100 thumbnail */}
+
+ {product.name}
+
+ )
+}
+```
+
+**Correct (request appropriately-sized image):**
+
+```tsx
+function ProductItem({ product }: { product: Product }) {
+ // Request a 200x200 image (2x for retina)
+ const thumbnailUrl = `${product.imageUrl}?w=200&h=200&fit=cover`
+
+ return (
+
+
+ {product.name}
+
+ )
+}
+```
+
+Use an optimized image component with built-in caching and placeholder support,
+such as `expo-image` or `SolitoImage` (which uses `expo-image` under the hood).
+Request images at 2x the display size for retina screens.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-inline-objects.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-inline-objects.md
new file mode 100644
index 000000000000..d5b6514a6658
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-inline-objects.md
@@ -0,0 +1,97 @@
+---
+title: Avoid Inline Objects in renderItem
+impact: HIGH
+impactDescription: prevents unnecessary re-renders of memoized list items
+tags: lists, performance, flatlist, virtualization, memo
+---
+
+## Avoid Inline Objects in renderItem
+
+Don't create new objects inside `renderItem` to pass as props. Inline objects
+create new references on every render, breaking memoization. Pass primitive
+values directly from `item` instead.
+
+**Incorrect (inline object breaks memoization):**
+
+```tsx
+function UserList({ users }: { users: User[] }) {
+ return (
+ (
+
+ )}
+ />
+ )
+}
+```
+
+**Incorrect (inline style object):**
+
+```tsx
+renderItem={({ item }) => (
+
+)}
+```
+
+**Correct (pass item directly or primitives):**
+
+```tsx
+function UserList({ users }: { users: User[] }) {
+ return (
+ (
+ // Good: pass the item directly
+
+ )}
+ />
+ )
+}
+```
+
+**Correct (pass primitives, derive inside child):**
+
+```tsx
+renderItem={({ item }) => (
+
+)}
+
+const UserRow = memo(function UserRow({ id, name, isActive }: Props) {
+ // Good: derive style inside memoized component
+ const backgroundColor = isActive ? 'green' : 'gray'
+ return {/* ... */}
+})
+```
+
+**Correct (hoist static styles in module scope):**
+
+```tsx
+const activeStyle = { backgroundColor: 'green' }
+const inactiveStyle = { backgroundColor: 'gray' }
+
+renderItem={({ item }) => (
+
+)}
+```
+
+Passing primitives or stable references allows `memo()` to skip re-renders when
+the actual values haven't changed.
+
+**Note:** If you have the React Compiler enabled, it handles memoization
+automatically and these manual optimizations become less critical.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-item-expensive.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-expensive.md
new file mode 100644
index 000000000000..f617a76d4e52
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-expensive.md
@@ -0,0 +1,94 @@
+---
+title: Keep List Items Lightweight
+impact: HIGH
+impactDescription: reduces render time for visible items during scroll
+tags: lists, performance, virtualization, hooks
+---
+
+## Keep List Items Lightweight
+
+List items should be as inexpensive as possible to render. Minimize hooks, avoid
+queries, and limit React Context access. Virtualized lists render many items
+during scroll—expensive items cause jank.
+
+**Incorrect (heavy list item):**
+
+```tsx
+function ProductRow({ id }: { id: string }) {
+ // Bad: query inside list item
+ const { data: product } = useQuery(['product', id], () => fetchProduct(id))
+ // Bad: multiple context accesses
+ const theme = useContext(ThemeContext)
+ const user = useContext(UserContext)
+ const cart = useContext(CartContext)
+ // Bad: expensive computation
+ const recommendations = useMemo(
+ () => computeRecommendations(product),
+ [product]
+ )
+
+ return {/* ... */}
+}
+```
+
+**Correct (lightweight list item):**
+
+```tsx
+function ProductRow({ name, price, imageUrl }: Props) {
+ // Good: receives only primitives, minimal hooks
+ return (
+
+
+ {name}
+ {price}
+
+ )
+}
+```
+
+**Move data fetching to parent:**
+
+```tsx
+// Parent fetches all data once
+function ProductList() {
+ const { data: products } = useQuery(['products'], fetchProducts)
+
+ return (
+ (
+
+ )}
+ />
+ )
+}
+```
+
+**For shared values, use Zustand selectors instead of Context:**
+
+```tsx
+// Incorrect: Context causes re-render when any cart value changes
+function ProductRow({ id, name }: Props) {
+ const { items } = useContext(CartContext)
+ const inCart = items.includes(id)
+ // ...
+}
+
+// Correct: Zustand selector only re-renders when this specific value changes
+function ProductRow({ id, name }: Props) {
+ // use Set.has (created once at the root) instead of Array.includes()
+ const inCart = useCartStore((s) => s.items.has(id))
+ // ...
+}
+```
+
+**Guidelines for list items:**
+
+- No queries or data fetching
+- No expensive computations (move to parent or memoize at parent level)
+- Prefer Zustand selectors over React Context
+- Minimize useState/useEffect hooks
+- Pass pre-computed values as props
+
+The goal: list items should be simple rendering functions that take props and
+return JSX.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-item-memo.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-memo.md
new file mode 100644
index 000000000000..634935e8ed0e
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-memo.md
@@ -0,0 +1,82 @@
+---
+title: Pass Primitives to List Items for Memoization
+impact: HIGH
+impactDescription: enables effective memo() comparison
+tags: lists, performance, memo, primitives
+---
+
+## Pass Primitives to List Items for Memoization
+
+When possible, pass only primitive values (strings, numbers, booleans) as props
+to list item components. Primitives enable shallow comparison in `memo()` to
+work correctly, skipping re-renders when values haven't changed.
+
+**Incorrect (object prop requires deep comparison):**
+
+```tsx
+type User = { id: string; name: string; email: string; avatar: string }
+
+const UserRow = memo(function UserRow({ user }: { user: User }) {
+ // memo() compares user by reference, not value
+ // If parent creates new user object, this re-renders even if data is same
+ return {user.name}
+})
+
+renderItem={({ item }) => }
+```
+
+This can still be optimized, but it is harder to memoize properly.
+
+**Correct (primitive props enable shallow comparison):**
+
+```tsx
+const UserRow = memo(function UserRow({
+ id,
+ name,
+ email,
+}: {
+ id: string
+ name: string
+ email: string
+}) {
+ // memo() compares each primitive directly
+ // Re-renders only if id, name, or email actually changed
+ return {name}
+})
+
+renderItem={({ item }) => (
+
+)}
+```
+
+**Pass only what you need:**
+
+```tsx
+// Incorrect: passing entire item when you only need name
+
+
+// Correct: pass only the fields the component uses
+
+```
+
+**For callbacks, hoist or use item ID:**
+
+```tsx
+// Incorrect: inline function creates new reference
+ handlePress(item.id)} />
+
+// Correct: pass ID, handle in child
+
+
+const UserRow = memo(function UserRow({ id, name }: Props) {
+ const handlePress = useCallback(() => {
+ // use id here
+ }, [id])
+ return {name}
+})
+```
+
+Primitive props make memoization predictable and effective.
+
+**Note:** If you have the React Compiler enabled, you do not need to use
+`memo()` or `useCallback()`, but the object references still apply.
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-item-types.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-types.md
new file mode 100644
index 000000000000..1027e4e6cd98
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-item-types.md
@@ -0,0 +1,104 @@
+---
+title: Use Item Types for Heterogeneous Lists
+impact: HIGH
+impactDescription: efficient recycling, less layout thrashing
+tags: list, performance, recycling, heterogeneous, LegendList
+---
+
+## Use Item Types for Heterogeneous Lists
+
+When a list has different item layouts (messages, images, headers, etc.), use a
+`type` field on each item and provide `getItemType` to the list. This puts items
+into separate recycling pools so a message component never gets recycled into an
+image component.
+
+**Incorrect (single component with conditionals):**
+
+```tsx
+type Item = { id: string; text?: string; imageUrl?: string; isHeader?: boolean }
+
+function ListItem({ item }: { item: Item }) {
+ if (item.isHeader) {
+ return
+ }
+ if (item.imageUrl) {
+ return
+ }
+ return
+}
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ recycleItems
+ />
+ )
+}
+```
+
+**Correct (typed items with separate components):**
+
+```tsx
+type HeaderItem = { id: string; type: 'header'; title: string }
+type MessageItem = { id: string; type: 'message'; text: string }
+type ImageItem = { id: string; type: 'image'; url: string }
+type FeedItem = HeaderItem | MessageItem | ImageItem
+
+function Feed({ items }: { items: FeedItem[] }) {
+ return (
+ item.id}
+ getItemType={(item) => item.type}
+ renderItem={({ item }) => {
+ switch (item.type) {
+ case 'header':
+ return
+ case 'message':
+ return
+ case 'image':
+ return
+ }
+ }}
+ recycleItems
+ />
+ )
+}
+```
+
+**Why this matters:**
+
+- **Recycling efficiency**: Items with the same type share a recycling pool
+- **No layout thrashing**: A header never recycles into an image cell
+- **Type safety**: TypeScript can narrow the item type in each branch
+- **Better size estimation**: Use `getEstimatedItemSize` with `itemType` for
+ accurate estimates per type
+
+```tsx
+ item.id}
+ getItemType={(item) => item.type}
+ getEstimatedItemSize={(index, item, itemType) => {
+ switch (itemType) {
+ case 'header':
+ return 48
+ case 'message':
+ return 72
+ case 'image':
+ return 300
+ default:
+ return 72
+ }
+ }}
+ renderItem={({ item }) => {
+ /* ... */
+ }}
+ recycleItems
+/>
+```
+
+Reference:
+[LegendList getItemType](https://legendapp.com/open-source/list/api/props/#getitemtype-v2)
diff --git a/.agents/skills/vercel-react-native-skills/rules/list-performance-virtualize.md b/.agents/skills/vercel-react-native-skills/rules/list-performance-virtualize.md
new file mode 100644
index 000000000000..8a393ba1eef9
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/list-performance-virtualize.md
@@ -0,0 +1,67 @@
+---
+title: Use a List Virtualizer for Any List
+impact: HIGH
+impactDescription: reduced memory, faster mounts
+tags: lists, performance, virtualization, scrollview
+---
+
+## Use a List Virtualizer for Any List
+
+Use a list virtualizer like LegendList or FlashList instead of ScrollView with
+mapped children—even for short lists. Virtualizers only render visible items,
+reducing memory usage and mount time. ScrollView renders all children upfront,
+which gets expensive quickly.
+
+**Incorrect (ScrollView renders all items at once):**
+
+```tsx
+function Feed({ items }: { items: Item[] }) {
+ return (
+
+ {items.map((item) => (
+
+ ))}
+
+ )
+}
+// 50 items = 50 components mounted, even if only 10 visible
+```
+
+**Correct (virtualizer renders only visible items):**
+
+```tsx
+import { LegendList } from '@legendapp/list'
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ keyExtractor={(item) => item.id}
+ estimatedItemSize={80}
+ />
+ )
+}
+// Only ~10-15 visible items mounted at a time
+```
+
+**Alternative (FlashList):**
+
+```tsx
+import { FlashList } from '@shopify/flash-list'
+
+function Feed({ items }: { items: Item[] }) {
+ return (
+ }
+ keyExtractor={(item) => item.id}
+ />
+ )
+}
+```
+
+Benefits apply to any screen with scrollable content—profiles, settings, feeds,
+search results. Default to virtualization.
diff --git a/.agents/skills/vercel-react-native-skills/rules/monorepo-native-deps-in-app.md b/.agents/skills/vercel-react-native-skills/rules/monorepo-native-deps-in-app.md
new file mode 100644
index 000000000000..ff85d76735d8
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/monorepo-native-deps-in-app.md
@@ -0,0 +1,46 @@
+---
+title: Install Native Dependencies in App Directory
+impact: CRITICAL
+impactDescription: required for autolinking to work
+tags: monorepo, native, autolinking, installation
+---
+
+## Install Native Dependencies in App Directory
+
+In a monorepo, packages with native code must be installed in the native app's
+directory directly. Autolinking only scans the app's `node_modules`—it won't
+find native dependencies installed in other packages.
+
+**Incorrect (native dep in shared package only):**
+
+```
+packages/
+ ui/
+ package.json # has react-native-reanimated
+ app/
+ package.json # missing react-native-reanimated
+```
+
+Autolinking fails—native code not linked.
+
+**Correct (native dep in app directory):**
+
+```
+packages/
+ ui/
+ package.json # has react-native-reanimated
+ app/
+ package.json # also has react-native-reanimated
+```
+
+```json
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+```
+
+Even if the shared package uses the native dependency, the app must also list it
+for autolinking to detect and link the native code.
diff --git a/.agents/skills/vercel-react-native-skills/rules/monorepo-single-dependency-versions.md b/.agents/skills/vercel-react-native-skills/rules/monorepo-single-dependency-versions.md
new file mode 100644
index 000000000000..1087dfa511e9
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/monorepo-single-dependency-versions.md
@@ -0,0 +1,63 @@
+---
+title: Use Single Dependency Versions Across Monorepo
+impact: MEDIUM
+impactDescription: avoids duplicate bundles, version conflicts
+tags: monorepo, dependencies, installation
+---
+
+## Use Single Dependency Versions Across Monorepo
+
+Use a single version of each dependency across all packages in your monorepo.
+Prefer exact versions over ranges. Multiple versions cause duplicate code in
+bundles, runtime conflicts, and inconsistent behavior across packages.
+
+Use a tool like syncpack to enforce this. As a last resort, use yarn resolutions
+or npm overrides.
+
+**Incorrect (version ranges, multiple versions):**
+
+```json
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "^3.0.0"
+ }
+}
+
+// packages/ui/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "^3.5.0"
+ }
+}
+```
+
+**Correct (exact versions, single source of truth):**
+
+```json
+// package.json (root)
+{
+ "pnpm": {
+ "overrides": {
+ "react-native-reanimated": "3.16.1"
+ }
+ }
+}
+
+// packages/app/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+
+// packages/ui/package.json
+{
+ "dependencies": {
+ "react-native-reanimated": "3.16.1"
+ }
+}
+```
+
+Use your package manager's override/resolution feature to enforce versions at
+the root. When adding dependencies, specify exact versions without `^` or `~`.
diff --git a/.agents/skills/vercel-react-native-skills/rules/navigation-native-navigators.md b/.agents/skills/vercel-react-native-skills/rules/navigation-native-navigators.md
new file mode 100644
index 000000000000..035c5fd37ce1
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/navigation-native-navigators.md
@@ -0,0 +1,188 @@
+---
+title: Use Native Navigators for Navigation
+impact: HIGH
+impactDescription: native performance, platform-appropriate UI
+tags: navigation, react-navigation, expo-router, native-stack, tabs
+---
+
+## Use Native Navigators for Navigation
+
+Always use native navigators instead of JS-based ones. Native navigators use
+platform APIs (UINavigationController on iOS, Fragment on Android) for better
+performance and native behavior.
+
+**For stacks:** Use `@react-navigation/native-stack` or expo-router's default
+stack (which uses native-stack). Avoid `@react-navigation/stack`.
+
+**For tabs:** Use `react-native-bottom-tabs` (native) or expo-router's native
+tabs. Avoid `@react-navigation/bottom-tabs` when native feel matters.
+
+### Stack Navigation
+
+**Incorrect (JS stack navigator):**
+
+```tsx
+import { createStackNavigator } from '@react-navigation/stack'
+
+const Stack = createStackNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct (native stack with react-navigation):**
+
+```tsx
+import { createNativeStackNavigator } from '@react-navigation/native-stack'
+
+const Stack = createNativeStackNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct (expo-router uses native stack by default):**
+
+```tsx
+// app/_layout.tsx
+import { Stack } from 'expo-router'
+
+export default function Layout() {
+ return
+}
+```
+
+### Tab Navigation
+
+**Incorrect (JS bottom tabs):**
+
+```tsx
+import { createBottomTabNavigator } from '@react-navigation/bottom-tabs'
+
+const Tab = createBottomTabNavigator()
+
+function App() {
+ return (
+
+
+
+
+ )
+}
+```
+
+**Correct (native bottom tabs with react-navigation):**
+
+```tsx
+import { createNativeBottomTabNavigator } from '@bottom-tabs/react-navigation'
+
+const Tab = createNativeBottomTabNavigator()
+
+function App() {
+ return (
+
+ ({ sfSymbol: 'house' }),
+ }}
+ />
+ ({ sfSymbol: 'gear' }),
+ }}
+ />
+
+ )
+}
+```
+
+**Correct (expo-router native tabs):**
+
+```tsx
+// app/(tabs)/_layout.tsx
+import { NativeTabs } from 'expo-router/unstable-native-tabs'
+
+export default function TabLayout() {
+ return (
+
+
+ Home
+
+
+
+ Settings
+
+
+
+ )
+}
+```
+
+On iOS, native tabs automatically enable `contentInsetAdjustmentBehavior` on the
+first `ScrollView` at the root of each tab screen, so content scrolls correctly
+behind the translucent tab bar. If you need to disable this, use
+`disableAutomaticContentInsets` on the trigger.
+
+### Prefer Native Header Options Over Custom Components
+
+**Incorrect (custom header component):**
+
+```tsx
+,
+ }}
+/>
+```
+
+**Correct (native header options):**
+
+```tsx
+
+```
+
+Native headers support iOS large titles, search bars, blur effects, and proper
+safe area handling automatically.
+
+### Why Native Navigators
+
+- **Performance**: Native transitions and gestures run on the UI thread
+- **Platform behavior**: Automatic iOS large titles, Android material design
+- **System integration**: Scroll-to-top on tab tap, PiP avoidance, proper safe
+ areas
+- **Accessibility**: Platform accessibility features work automatically
+
+Reference:
+
+- [React Navigation Native Stack](https://reactnavigation.org/docs/native-stack-navigator)
+- [React Native Bottom Tabs with React Navigation](https://oss.callstack.com/react-native-bottom-tabs/docs/guides/usage-with-react-navigation)
+- [React Native Bottom Tabs with Expo Router](https://oss.callstack.com/react-native-bottom-tabs/docs/guides/usage-with-expo-router)
+- [Expo Router Native Tabs](https://docs.expo.dev/router/advanced/native-tabs)
diff --git a/.agents/skills/vercel-react-native-skills/rules/react-compiler-destructure-functions.md b/.agents/skills/vercel-react-native-skills/rules/react-compiler-destructure-functions.md
new file mode 100644
index 000000000000..f76c25ac6f8c
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/react-compiler-destructure-functions.md
@@ -0,0 +1,50 @@
+---
+title: Destructure Functions Early in Render (React Compiler)
+impact: HIGH
+impactDescription: stable references, fewer re-renders
+tags: rerender, hooks, performance, react-compiler
+---
+
+## Destructure Functions Early in Render
+
+This rule is only applicable if you are using the React Compiler.
+
+Destructure functions from hooks at the top of render scope. Never dot into
+objects to call functions. Destructured functions are stable references; dotting
+creates new references and breaks memoization.
+
+**Incorrect (dotting into object):**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton(props) {
+ const router = useRouter()
+
+ // bad: react-compiler will key the cache on "props" and "router", which are objects that change each render
+ const handlePress = () => {
+ props.onSave()
+ router.push('/success') // unstable reference
+ }
+
+ return
+}
+```
+
+**Correct (destructure early):**
+
+```tsx
+import { useRouter } from 'expo-router'
+
+function SaveButton({ onSave }) {
+ const { push } = useRouter()
+
+ // good: react-compiler will key on push and onSave
+ const handlePress = () => {
+ onSave()
+ push('/success') // stable reference
+ }
+
+ return
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/react-compiler-reanimated-shared-values.md b/.agents/skills/vercel-react-native-skills/rules/react-compiler-reanimated-shared-values.md
new file mode 100644
index 000000000000..0dcbaf47a6ab
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/react-compiler-reanimated-shared-values.md
@@ -0,0 +1,48 @@
+---
+title: Use .get() and .set() for Reanimated Shared Values (not .value)
+impact: LOW
+impactDescription: required for React Compiler compatibility
+tags: reanimated, react-compiler, shared-values
+---
+
+## Use .get() and .set() for Shared Values with React Compiler
+
+With React Compiler enabled, use `.get()` and `.set()` instead of reading or
+writing `.value` directly on Reanimated shared values. The compiler can't track
+property access—explicit methods ensure correct behavior.
+
+**Incorrect (breaks with React Compiler):**
+
+```tsx
+import { useSharedValue } from 'react-native-reanimated'
+
+function Counter() {
+ const count = useSharedValue(0)
+
+ const increment = () => {
+ count.value = count.value + 1 // opts out of react compiler
+ }
+
+ return
+}
+```
+
+**Correct (React Compiler compatible):**
+
+```tsx
+import { useSharedValue } from 'react-native-reanimated'
+
+function Counter() {
+ const count = useSharedValue(0)
+
+ const increment = () => {
+ count.set(count.get() + 1)
+ }
+
+ return
+}
+```
+
+See the
+[Reanimated docs](https://docs.swmansion.com/react-native-reanimated/docs/core/useSharedValue/#react-compiler-support)
+for more.
diff --git a/.agents/skills/vercel-react-native-skills/rules/react-state-dispatcher.md b/.agents/skills/vercel-react-native-skills/rules/react-state-dispatcher.md
new file mode 100644
index 000000000000..93e8b6db6112
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/react-state-dispatcher.md
@@ -0,0 +1,91 @@
+---
+title: useState Dispatch updaters for State That Depends on Current Value
+impact: MEDIUM
+impactDescription: avoids stale closures, prevents unnecessary re-renders
+tags: state, hooks, useState, callbacks
+---
+
+## Use Dispatch Updaters for State That Depends on Current Value
+
+When the next state depends on the current state, use a dispatch updater
+(`setState(prev => ...)`) instead of reading the state variable directly in a
+callback. This avoids stale closures and ensures you're comparing against the
+latest value.
+
+**Incorrect (reads state directly):**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ // size may be stale in this closure
+ if (size?.width !== width || size?.height !== height) {
+ setSize({ width, height })
+ }
+}
+```
+
+**Correct (dispatch updater):**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => {
+ if (prev?.width === width && prev?.height === height) return prev
+ return { width, height }
+ })
+}
+```
+
+Returning the previous value from the updater skips the re-render.
+
+For primitive states, you don't need to compare values before firing a
+re-render.
+
+**Incorrect (unnecessary comparison for primitive state):**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => (prev === width ? prev : width))
+}
+```
+
+**Correct (sets primitive state directly):**
+
+```tsx
+const [size, setSize] = useState(undefined)
+
+const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize(width)
+}
+```
+
+However, if the next state depends on the current state, you should still use a
+dispatch updater.
+
+**Incorrect (reads state directly from the callback):**
+
+```tsx
+const [count, setCount] = useState(0)
+
+const onTap = () => {
+ setCount(count + 1)
+}
+```
+
+**Correct (dispatch updater):**
+
+```tsx
+const [count, setCount] = useState(0)
+
+const onTap = () => {
+ setCount((prev) => prev + 1)
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/react-state-fallback.md b/.agents/skills/vercel-react-native-skills/rules/react-state-fallback.md
new file mode 100644
index 000000000000..204f34665f20
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/react-state-fallback.md
@@ -0,0 +1,56 @@
+---
+title: Use fallback state instead of initialState
+impact: MEDIUM
+impactDescription: reactive fallbacks without syncing
+tags: state, hooks, derived-state, props, initialState
+---
+
+## Use fallback state instead of initialState
+
+Use `undefined` as initial state and nullish coalescing (`??`) to fall back to
+parent or server values. State represents user intent only—`undefined` means
+"user hasn't chosen yet." This enables reactive fallbacks that update when the
+source changes, not just on initial render.
+
+**Incorrect (syncs state, loses reactivity):**
+
+```tsx
+type Props = { fallbackEnabled: boolean }
+
+function Toggle({ fallbackEnabled }: Props) {
+ const [enabled, setEnabled] = useState(defaultEnabled)
+ // If fallbackEnabled changes, state is stale
+ // State mixes user intent with default value
+
+ return
+}
+```
+
+**Correct (state is user intent, reactive fallback):**
+
+```tsx
+type Props = { fallbackEnabled: boolean }
+
+function Toggle({ fallbackEnabled }: Props) {
+ const [_enabled, setEnabled] = useState(undefined)
+ const enabled = _enabled ?? defaultEnabled
+ // undefined = user hasn't touched it, falls back to prop
+ // If defaultEnabled changes, component reflects it
+ // Once user interacts, their choice persists
+
+ return
+}
+```
+
+**With server data:**
+
+```tsx
+function ProfileForm({ data }: { data: User }) {
+ const [_theme, setTheme] = useState(undefined)
+ const theme = _theme ?? data.theme
+ // Shows server value until user overrides
+ // Server refetch updates the fallback automatically
+
+ return
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/react-state-minimize.md b/.agents/skills/vercel-react-native-skills/rules/react-state-minimize.md
new file mode 100644
index 000000000000..64605b6c382e
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/react-state-minimize.md
@@ -0,0 +1,65 @@
+---
+title: Minimize State Variables and Derive Values
+impact: MEDIUM
+impactDescription: fewer re-renders, less state drift
+tags: state, derived-state, hooks, optimization
+---
+
+## Minimize State Variables and Derive Values
+
+Use the fewest state variables possible. If a value can be computed from existing state or props, derive it during render instead of storing it in state. Redundant state causes unnecessary re-renders and can drift out of sync.
+
+**Incorrect (redundant state):**
+
+```tsx
+function Cart({ items }: { items: Item[] }) {
+ const [total, setTotal] = useState(0)
+ const [itemCount, setItemCount] = useState(0)
+
+ useEffect(() => {
+ setTotal(items.reduce((sum, item) => sum + item.price, 0))
+ setItemCount(items.length)
+ }, [items])
+
+ return (
+
+ {itemCount} items
+ Total: ${total}
+
+ )
+}
+```
+
+**Correct (derived values):**
+
+```tsx
+function Cart({ items }: { items: Item[] }) {
+ const total = items.reduce((sum, item) => sum + item.price, 0)
+ const itemCount = items.length
+
+ return (
+
+ {itemCount} items
+ Total: ${total}
+
+ )
+}
+```
+
+**Another example:**
+
+```tsx
+// Incorrect: storing both firstName, lastName, AND fullName
+const [firstName, setFirstName] = useState('')
+const [lastName, setLastName] = useState('')
+const [fullName, setFullName] = useState('')
+
+// Correct: derive fullName
+const [firstName, setFirstName] = useState('')
+const [lastName, setLastName] = useState('')
+const fullName = `${firstName} ${lastName}`
+```
+
+State should be the minimal source of truth. Everything else is derived.
+
+Reference: [Choosing the State Structure](https://react.dev/learn/choosing-the-state-structure)
diff --git a/.agents/skills/vercel-react-native-skills/rules/rendering-no-falsy-and.md b/.agents/skills/vercel-react-native-skills/rules/rendering-no-falsy-and.md
new file mode 100644
index 000000000000..30f05d3f8bea
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/rendering-no-falsy-and.md
@@ -0,0 +1,74 @@
+---
+title: Never Use && with Potentially Falsy Values
+impact: CRITICAL
+impactDescription: prevents production crash
+tags: rendering, conditional, jsx, crash
+---
+
+## Never Use && with Potentially Falsy Values
+
+Never use `{value && }` when `value` could be an empty string or
+`0`. These are falsy but JSX-renderable—React Native will try to render them as
+text outside a `` component, causing a hard crash in production.
+
+**Incorrect (crashes if count is 0 or name is ""):**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {name && {name}}
+ {count && {count} items}
+
+ )
+}
+// If name="" or count=0, renders the falsy value → crash
+```
+
+**Correct (ternary with null):**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {name ? {name} : null}
+ {count ? {count} items : null}
+
+ )
+}
+```
+
+**Correct (explicit boolean coercion):**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ return (
+
+ {!!name && {name}}
+ {!!count && {count} items}
+
+ )
+}
+```
+
+**Best (early return):**
+
+```tsx
+function Profile({ name, count }: { name: string; count: number }) {
+ if (!name) return null
+
+ return (
+
+ {name}
+ {count > 0 ? {count} items : null}
+
+ )
+}
+```
+
+Early returns are clearest. When using conditionals inline, prefer ternary or
+explicit boolean checks.
+
+**Lint rule:** Enable `react/jsx-no-leaked-render` from
+[eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/jsx-no-leaked-render.md)
+to catch this automatically.
diff --git a/.agents/skills/vercel-react-native-skills/rules/rendering-text-in-text-component.md b/.agents/skills/vercel-react-native-skills/rules/rendering-text-in-text-component.md
new file mode 100644
index 000000000000..fd1b9f407014
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/rendering-text-in-text-component.md
@@ -0,0 +1,36 @@
+---
+title: Wrap Strings in Text Components
+impact: CRITICAL
+impactDescription: prevents runtime crash
+tags: rendering, text, core
+---
+
+## Wrap Strings in Text Components
+
+Strings must be rendered inside ``. React Native crashes if a string is a
+direct child of ``.
+
+**Incorrect (crashes):**
+
+```tsx
+import { View } from 'react-native'
+
+function Greeting({ name }: { name: string }) {
+ return Hello, {name}!
+}
+// Error: Text strings must be rendered within a component.
+```
+
+**Correct:**
+
+```tsx
+import { View, Text } from 'react-native'
+
+function Greeting({ name }: { name: string }) {
+ return (
+
+ Hello, {name}!
+
+ )
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/scroll-position-no-state.md b/.agents/skills/vercel-react-native-skills/rules/scroll-position-no-state.md
new file mode 100644
index 000000000000..a5760cd2892a
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/scroll-position-no-state.md
@@ -0,0 +1,82 @@
+---
+title: Never Track Scroll Position in useState
+impact: HIGH
+impactDescription: prevents render thrashing during scroll
+tags: scroll, performance, reanimated, useRef
+---
+
+## Never Track Scroll Position in useState
+
+Never store scroll position in `useState`. Scroll events fire rapidly—state
+updates cause render thrashing and dropped frames. Use a Reanimated shared value
+for animations or a ref for non-reactive tracking.
+
+**Incorrect (useState causes jank):**
+
+```tsx
+import { useState } from 'react'
+import {
+ ScrollView,
+ NativeSyntheticEvent,
+ NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+ const [scrollY, setScrollY] = useState(0)
+
+ const onScroll = (e: NativeSyntheticEvent) => {
+ setScrollY(e.nativeEvent.contentOffset.y) // re-renders on every frame
+ }
+
+ return
+}
+```
+
+**Correct (Reanimated for animations):**
+
+```tsx
+import Animated, {
+ useSharedValue,
+ useAnimatedScrollHandler,
+} from 'react-native-reanimated'
+
+function Feed() {
+ const scrollY = useSharedValue(0)
+
+ const onScroll = useAnimatedScrollHandler({
+ onScroll: (e) => {
+ scrollY.value = e.contentOffset.y // runs on UI thread, no re-render
+ },
+ })
+
+ return (
+
+ )
+}
+```
+
+**Correct (ref for non-reactive tracking):**
+
+```tsx
+import { useRef } from 'react'
+import {
+ ScrollView,
+ NativeSyntheticEvent,
+ NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+ const scrollY = useRef(0)
+
+ const onScroll = (e: NativeSyntheticEvent) => {
+ scrollY.current = e.nativeEvent.contentOffset.y // no re-render
+ }
+
+ return
+}
+```
diff --git a/.agents/skills/vercel-react-native-skills/rules/state-ground-truth.md b/.agents/skills/vercel-react-native-skills/rules/state-ground-truth.md
new file mode 100644
index 000000000000..c3c4bd9e497b
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/state-ground-truth.md
@@ -0,0 +1,80 @@
+---
+title: State Must Represent Ground Truth
+impact: HIGH
+impactDescription: cleaner logic, easier debugging, single source of truth
+tags: state, derived-state, reanimated, hooks
+---
+
+## State Must Represent Ground Truth
+
+State variables—both React `useState` and Reanimated shared values—should
+represent the actual state of something (e.g., `pressed`, `progress`, `isOpen`),
+not derived visual values (e.g., `scale`, `opacity`, `translateY`). Derive
+visual values from state using computation or interpolation.
+
+**Incorrect (storing the visual output):**
+
+```tsx
+const scale = useSharedValue(1)
+
+const tap = Gesture.Tap()
+ .onBegin(() => {
+ scale.set(withTiming(0.95))
+ })
+ .onFinalize(() => {
+ scale.set(withTiming(1))
+ })
+
+const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: scale.get() }],
+}))
+```
+
+**Correct (storing the state, deriving the visual):**
+
+```tsx
+const pressed = useSharedValue(0) // 0 = not pressed, 1 = pressed
+
+const tap = Gesture.Tap()
+ .onBegin(() => {
+ pressed.set(withTiming(1))
+ })
+ .onFinalize(() => {
+ pressed.set(withTiming(0))
+ })
+
+const animatedStyle = useAnimatedStyle(() => ({
+ transform: [{ scale: interpolate(pressed.get(), [0, 1], [1, 0.95]) }],
+}))
+```
+
+**Why this matters:**
+
+State variables should represent real "state", not necessarily a desired end
+result.
+
+1. **Single source of truth** — The state (`pressed`) describes what's
+ happening; visuals are derived
+2. **Easier to extend** — Adding opacity, rotation, or other effects just
+ requires more interpolations from the same state
+3. **Debugging** — Inspecting `pressed = 1` is clearer than `scale = 0.95`
+4. **Reusable logic** — The same `pressed` value can drive multiple visual
+ properties
+
+**Same principle for React state:**
+
+```tsx
+// Incorrect: storing derived values
+const [isExpanded, setIsExpanded] = useState(false)
+const [height, setHeight] = useState(0)
+
+useEffect(() => {
+ setHeight(isExpanded ? 200 : 0)
+}, [isExpanded])
+
+// Correct: derive from state
+const [isExpanded, setIsExpanded] = useState(false)
+const height = isExpanded ? 200 : 0
+```
+
+State is the minimal truth. Everything else is derived.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-expo-image.md b/.agents/skills/vercel-react-native-skills/rules/ui-expo-image.md
new file mode 100644
index 000000000000..72d768f1bf89
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-expo-image.md
@@ -0,0 +1,66 @@
+---
+title: Use expo-image for Optimized Images
+impact: HIGH
+impactDescription: memory efficiency, caching, blurhash placeholders, progressive loading
+tags: images, performance, expo-image, ui
+---
+
+## Use expo-image for Optimized Images
+
+Use `expo-image` instead of React Native's `Image`. It provides memory-efficient caching, blurhash placeholders, progressive loading, and better performance for lists.
+
+**Incorrect (React Native Image):**
+
+```tsx
+import { Image } from 'react-native'
+
+function Avatar({ url }: { url: string }) {
+ return
+}
+```
+
+**Correct (expo-image):**
+
+```tsx
+import { Image } from 'expo-image'
+
+function Avatar({ url }: { url: string }) {
+ return
+}
+```
+
+**With blurhash placeholder:**
+
+```tsx
+
+```
+
+**With priority and caching:**
+
+```tsx
+
+```
+
+**Key props:**
+
+- `placeholder` — Blurhash or thumbnail while loading
+- `contentFit` — `cover`, `contain`, `fill`, `scale-down`
+- `transition` — Fade-in duration (ms)
+- `priority` — `low`, `normal`, `high`
+- `cachePolicy` — `memory`, `disk`, `memory-disk`, `none`
+- `recyclingKey` — Unique key for list recycling
+
+For cross-platform (web + native), use `SolitoImage` from `solito/image` which uses `expo-image` under the hood.
+
+Reference: [expo-image](https://docs.expo.dev/versions/latest/sdk/image/)
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-image-gallery.md b/.agents/skills/vercel-react-native-skills/rules/ui-image-gallery.md
new file mode 100644
index 000000000000..ef26d962f376
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-image-gallery.md
@@ -0,0 +1,104 @@
+---
+title: Use Galeria for Image Galleries and Lightbox
+impact: MEDIUM
+impactDescription:
+ native shared element transitions, pinch-to-zoom, pan-to-close
+tags: images, gallery, lightbox, expo-image, ui
+---
+
+## Use Galeria for Image Galleries and Lightbox
+
+For image galleries with lightbox (tap to fullscreen), use `@nandorojo/galeria`.
+It provides native shared element transitions with pinch-to-zoom, double-tap
+zoom, and pan-to-close. Works with any image component including `expo-image`.
+
+**Incorrect (custom modal implementation):**
+
+```tsx
+function ImageGallery({ urls }: { urls: string[] }) {
+ const [selected, setSelected] = useState(null)
+
+ return (
+ <>
+ {urls.map((url) => (
+ setSelected(url)}>
+
+
+ ))}
+ setSelected(null)}>
+
+
+
+ )
+}
+```
+
+**Correct (Galeria with expo-image):**
+
+```tsx
+import { Galeria } from '@nandorojo/galeria'
+import { Image } from 'expo-image'
+
+function ImageGallery({ urls }: { urls: string[] }) {
+ return (
+
+ {urls.map((url, index) => (
+
+
+
+ ))}
+
+ )
+}
+```
+
+**Single image:**
+
+```tsx
+import { Galeria } from '@nandorojo/galeria'
+import { Image } from 'expo-image'
+
+function Avatar({ url }: { url: string }) {
+ return (
+
+
+
+
+
+ )
+}
+```
+
+**With low-res thumbnails and high-res fullscreen:**
+
+```tsx
+
+ {lowResUrls.map((url, index) => (
+
+
+
+ ))}
+
+```
+
+**With FlashList:**
+
+```tsx
+
+ (
+
+
+
+ )}
+ numColumns={3}
+ estimatedItemSize={100}
+ />
+
+```
+
+Works with `expo-image`, `SolitoImage`, `react-native` Image, or any image
+component.
+
+Reference: [Galeria](https://github.com/nandorojo/galeria)
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-measure-views.md b/.agents/skills/vercel-react-native-skills/rules/ui-measure-views.md
new file mode 100644
index 000000000000..8b783fee314e
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-measure-views.md
@@ -0,0 +1,78 @@
+---
+title: Measuring View Dimensions
+impact: MEDIUM
+impactDescription: synchronous measurement, avoid unnecessary re-renders
+tags: layout, measurement, onLayout, useLayoutEffect
+---
+
+## Measuring View Dimensions
+
+Use both `useLayoutEffect` (synchronous) and `onLayout` (for updates). The sync
+measurement gives you the initial size immediately; `onLayout` keeps it current
+when the view changes. For non-primitive states, use a dispatch updater to
+compare values and avoid unnecessary re-renders.
+
+**Height only:**
+
+```tsx
+import { useLayoutEffect, useRef, useState } from 'react'
+import { View, LayoutChangeEvent } from 'react-native'
+
+function MeasuredBox({ children }: { children: React.ReactNode }) {
+ const ref = useRef(null)
+ const [height, setHeight] = useState(undefined)
+
+ useLayoutEffect(() => {
+ // Sync measurement on mount (RN 0.82+)
+ const rect = ref.current?.getBoundingClientRect()
+ if (rect) setHeight(rect.height)
+ // Pre-0.82: ref.current?.measure((x, y, w, h) => setHeight(h))
+ }, [])
+
+ const onLayout = (e: LayoutChangeEvent) => {
+ setHeight(e.nativeEvent.layout.height)
+ }
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+**Both dimensions:**
+
+```tsx
+import { useLayoutEffect, useRef, useState } from 'react'
+import { View, LayoutChangeEvent } from 'react-native'
+
+type Size = { width: number; height: number }
+
+function MeasuredBox({ children }: { children: React.ReactNode }) {
+ const ref = useRef(null)
+ const [size, setSize] = useState(undefined)
+
+ useLayoutEffect(() => {
+ const rect = ref.current?.getBoundingClientRect()
+ if (rect) setSize({ width: rect.width, height: rect.height })
+ }, [])
+
+ const onLayout = (e: LayoutChangeEvent) => {
+ const { width, height } = e.nativeEvent.layout
+ setSize((prev) => {
+ // for non-primitive states, compare values before firing a re-render
+ if (prev?.width === width && prev?.height === height) return prev
+ return { width, height }
+ })
+ }
+
+ return (
+
+ {children}
+
+ )
+}
+```
+
+Use functional setState to compare—don't read state directly in the callback.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-menus.md b/.agents/skills/vercel-react-native-skills/rules/ui-menus.md
new file mode 100644
index 000000000000..5168bc2037ca
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-menus.md
@@ -0,0 +1,174 @@
+---
+title: Use Native Menus for Dropdowns and Context Menus
+impact: HIGH
+impactDescription: native accessibility, platform-consistent UX
+tags: user-interface, menus, context-menus, zeego, accessibility
+---
+
+## Use Native Menus for Dropdowns and Context Menus
+
+Use native platform menus instead of custom JS implementations. Native menus
+provide built-in accessibility, consistent platform UX, and better performance.
+Use [zeego](https://zeego.dev) for cross-platform native menus.
+
+**Incorrect (custom JS menu):**
+
+```tsx
+import { useState } from 'react'
+import { View, Pressable, Text } from 'react-native'
+
+function MyMenu() {
+ const [open, setOpen] = useState(false)
+
+ return (
+
+ setOpen(!open)}>
+ Open Menu
+
+ {open && (
+
+ console.log('edit')}>
+ Edit
+
+ console.log('delete')}>
+ Delete
+
+
+ )}
+
+ )
+}
+```
+
+**Correct (native menu with zeego):**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function MyMenu() {
+ return (
+
+
+
+ Open Menu
+
+
+
+
+ console.log('edit')}>
+ Edit
+
+
+ console.log('delete')}
+ >
+ Delete
+
+
+
+ )
+}
+```
+
+**Context menu (long-press):**
+
+```tsx
+import * as ContextMenu from 'zeego/context-menu'
+
+function MyContextMenu() {
+ return (
+
+
+
+ Long press me
+
+
+
+
+ console.log('copy')}>
+ Copy
+
+
+ console.log('paste')}>
+ Paste
+
+
+
+ )
+}
+```
+
+**Checkbox items:**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function SettingsMenu() {
+ const [notifications, setNotifications] = useState(true)
+
+ return (
+
+
+
+ Settings
+
+
+
+
+ setNotifications((prev) => !prev)}
+ >
+
+ Notifications
+
+
+
+ )
+}
+```
+
+**Submenus:**
+
+```tsx
+import * as DropdownMenu from 'zeego/dropdown-menu'
+
+function MenuWithSubmenu() {
+ return (
+
+
+
+ Options
+
+
+
+
+ console.log('home')}>
+ Home
+
+
+
+
+ More Options
+
+
+
+
+ Settings
+
+
+
+ Help
+
+
+
+
+
+ )
+}
+```
+
+Reference: [Zeego Documentation](https://zeego.dev/components/dropdown-menu)
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-native-modals.md b/.agents/skills/vercel-react-native-skills/rules/ui-native-modals.md
new file mode 100644
index 000000000000..f560e11e12e7
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-native-modals.md
@@ -0,0 +1,77 @@
+---
+title: Use Native Modals Over JS-Based Bottom Sheets
+impact: HIGH
+impactDescription: native performance, gestures, accessibility
+tags: modals, bottom-sheet, native, react-navigation
+---
+
+## Use Native Modals Over JS-Based Bottom Sheets
+
+Use native `` with `presentationStyle="formSheet"` or React Navigation
+v7's native form sheet instead of JS-based bottom sheet libraries. Native modals
+have built-in gestures, accessibility, and better performance. Rely on native UI
+for low-level primitives.
+
+**Incorrect (JS-based bottom sheet):**
+
+```tsx
+import BottomSheet from 'custom-js-bottom-sheet'
+
+function MyScreen() {
+ const sheetRef = useRef(null)
+
+ return (
+
+
+ )
+}
+```
+
+**Correct (native Modal with formSheet):**
+
+```tsx
+import { Modal, View, Text, Button } from 'react-native'
+
+function MyScreen() {
+ const [visible, setVisible] = useState(false)
+
+ return (
+
+
+ )
+}
+```
+
+**Correct (React Navigation v7 native form sheet):**
+
+```tsx
+// In your navigator
+
+```
+
+Native modals provide swipe-to-dismiss, proper keyboard avoidance, and
+accessibility out of the box.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-pressable.md b/.agents/skills/vercel-react-native-skills/rules/ui-pressable.md
new file mode 100644
index 000000000000..31c3d2042742
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-pressable.md
@@ -0,0 +1,61 @@
+---
+title: Use Pressable Instead of Touchable Components
+impact: LOW
+impactDescription: modern API, more flexible
+tags: ui, pressable, touchable, gestures
+---
+
+## Use Pressable Instead of Touchable Components
+
+Never use `TouchableOpacity` or `TouchableHighlight`. Use `Pressable` from
+`react-native` or `react-native-gesture-handler` instead.
+
+**Incorrect (legacy Touchable components):**
+
+```tsx
+import { TouchableOpacity } from 'react-native'
+
+function MyButton({ onPress }: { onPress: () => void }) {
+ return (
+
+ Press me
+
+ )
+}
+```
+
+**Correct (Pressable):**
+
+```tsx
+import { Pressable } from 'react-native'
+
+function MyButton({ onPress }: { onPress: () => void }) {
+ return (
+
+ Press me
+
+ )
+}
+```
+
+**Correct (Pressable from gesture handler for lists):**
+
+```tsx
+import { Pressable } from 'react-native-gesture-handler'
+
+function ListItem({ onPress }: { onPress: () => void }) {
+ return (
+
+ Item
+
+ )
+}
+```
+
+Use `react-native-gesture-handler` Pressable inside scrollable lists for better
+gesture coordination, as long as you are using the ScrollView from
+`react-native-gesture-handler` as well.
+
+**For animated press states (scale, opacity changes):** Use `GestureDetector`
+with Reanimated shared values instead of Pressable's style callback. See the
+`animation-gesture-detector-press` rule.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-safe-area-scroll.md b/.agents/skills/vercel-react-native-skills/rules/ui-safe-area-scroll.md
new file mode 100644
index 000000000000..79812bc9ce35
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-safe-area-scroll.md
@@ -0,0 +1,65 @@
+---
+title: Use contentInsetAdjustmentBehavior for Safe Areas
+impact: MEDIUM
+impactDescription: native safe area handling, no layout shifts
+tags: safe-area, scrollview, layout
+---
+
+## Use contentInsetAdjustmentBehavior for Safe Areas
+
+Use `contentInsetAdjustmentBehavior="automatic"` on the root ScrollView instead of wrapping content in SafeAreaView or manual padding. This lets iOS handle safe area insets natively with proper scroll behavior.
+
+**Incorrect (SafeAreaView wrapper):**
+
+```tsx
+import { SafeAreaView, ScrollView, View, Text } from 'react-native'
+
+function MyScreen() {
+ return (
+
+
+
+ Content
+
+
+
+ )
+}
+```
+
+**Incorrect (manual safe area padding):**
+
+```tsx
+import { ScrollView, View, Text } from 'react-native'
+import { useSafeAreaInsets } from 'react-native-safe-area-context'
+
+function MyScreen() {
+ const insets = useSafeAreaInsets()
+
+ return (
+
+
+ Content
+
+
+ )
+}
+```
+
+**Correct (native content inset adjustment):**
+
+```tsx
+import { ScrollView, View, Text } from 'react-native'
+
+function MyScreen() {
+ return (
+
+
+ Content
+
+
+ )
+}
+```
+
+The native approach handles dynamic safe areas (keyboard, toolbars) and allows content to scroll behind the status bar naturally.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-scrollview-content-inset.md b/.agents/skills/vercel-react-native-skills/rules/ui-scrollview-content-inset.md
new file mode 100644
index 000000000000..bbebc3b81c22
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-scrollview-content-inset.md
@@ -0,0 +1,45 @@
+---
+title: Use contentInset for Dynamic ScrollView Spacing
+impact: LOW
+impactDescription: smoother updates, no layout recalculation
+tags: scrollview, layout, contentInset, performance
+---
+
+## Use contentInset for Dynamic ScrollView Spacing
+
+When adding space to the top or bottom of a ScrollView that may change
+(keyboard, toolbars, dynamic content), use `contentInset` instead of padding.
+Changing `contentInset` doesn't trigger layout recalculation—it adjusts the
+scroll area without re-rendering content.
+
+**Incorrect (padding causes layout recalculation):**
+
+```tsx
+function Feed({ bottomOffset }: { bottomOffset: number }) {
+ return (
+
+ {children}
+
+ )
+}
+// Changing bottomOffset triggers full layout recalculation
+```
+
+**Correct (contentInset for dynamic spacing):**
+
+```tsx
+function Feed({ bottomOffset }: { bottomOffset: number }) {
+ return (
+
+ {children}
+
+ )
+}
+// Changing bottomOffset only adjusts scroll bounds
+```
+
+Use `scrollIndicatorInsets` alongside `contentInset` to keep the scroll
+indicator aligned. For static spacing that never changes, padding is fine.
diff --git a/.agents/skills/vercel-react-native-skills/rules/ui-styling.md b/.agents/skills/vercel-react-native-skills/rules/ui-styling.md
new file mode 100644
index 000000000000..3908de3c4bbd
--- /dev/null
+++ b/.agents/skills/vercel-react-native-skills/rules/ui-styling.md
@@ -0,0 +1,87 @@
+---
+title: Modern React Native Styling Patterns
+impact: MEDIUM
+impactDescription: consistent design, smoother borders, cleaner layouts
+tags: styling, css, layout, shadows, gradients
+---
+
+## Modern React Native Styling Patterns
+
+Follow these styling patterns for cleaner, more consistent React Native code.
+
+**Always use `borderCurve: 'continuous'` with `borderRadius`:**
+
+```tsx
+// Incorrect
+{ borderRadius: 12 }
+
+// Correct – smoother iOS-style corners
+{ borderRadius: 12, borderCurve: 'continuous' }
+```
+
+**Use `gap` instead of margin for spacing between elements:**
+
+```tsx
+// Incorrect – margin on children
+
+ Title
+ Subtitle
+
+
+// Correct – gap on parent
+
+ Title
+ Subtitle
+
+```
+
+**Use `padding` for space within, `gap` for space between:**
+
+```tsx
+
+ First
+ Second
+
+```
+
+**Use `experimental_backgroundImage` for linear gradients:**
+
+```tsx
+// Incorrect – third-party gradient library
+
+
+// Correct – native CSS gradient syntax
+
+```
+
+**Use CSS `boxShadow` string syntax for shadows:**
+
+```tsx
+// Incorrect – legacy shadow objects or elevation
+{ shadowColor: '#000', shadowOffset: { width: 0, height: 2 }, shadowOpacity: 0.1 }
+{ elevation: 4 }
+
+// Correct – CSS box-shadow syntax
+{ boxShadow: '0 2px 8px rgba(0, 0, 0, 0.1)' }
+```
+
+**Avoid multiple font sizes – use weight and color for emphasis:**
+
+```tsx
+// Incorrect – varying font sizes for hierarchy
+Title
+Subtitle
+Caption
+
+// Correct – consistent size, vary weight and color
+Title
+Subtitle
+Caption
+```
+
+Limiting font sizes creates visual consistency. Use `fontWeight` (bold/semibold)
+and grayscale colors for hierarchy instead.
diff --git a/.agents/skills/web-design-guidelines/SKILL.md b/.agents/skills/web-design-guidelines/SKILL.md
new file mode 100644
index 000000000000..ceae92ab3192
--- /dev/null
+++ b/.agents/skills/web-design-guidelines/SKILL.md
@@ -0,0 +1,39 @@
+---
+name: web-design-guidelines
+description: Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".
+metadata:
+ author: vercel
+ version: "1.0.0"
+ argument-hint:
+---
+
+# Web Interface Guidelines
+
+Review files for compliance with Web Interface Guidelines.
+
+## How It Works
+
+1. Fetch the latest guidelines from the source URL below
+2. Read the specified files (or prompt user for files/pattern)
+3. Check against all rules in the fetched guidelines
+4. Output findings in the terse `file:line` format
+
+## Guidelines Source
+
+Fetch fresh guidelines before each review:
+
+```
+https://raw.githubusercontent.com/vercel-labs/web-interface-guidelines/main/command.md
+```
+
+Use WebFetch to retrieve the latest rules. The fetched content contains all the rules and output format instructions.
+
+## Usage
+
+When a user provides a file or pattern argument:
+1. Fetch guidelines from the source URL above
+2. Read the specified files
+3. Apply all rules from the fetched guidelines
+4. Output findings using the format specified in the guidelines
+
+If no files specified, ask the user which files to review.