Revise frontend development guidelines description
Updated the description to clarify the guidelines and standards for frontend development in React and TypeScript applications. Enhanced the structure and content for better readability and understanding.
This commit is contained in:
Munir Abbasi
GitHub
@@ -1,354 +1,284 @@
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---
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name: frontend-dev-guidelines
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description: Frontend development guidelines for React/TypeScript applications. Modern patterns including Suspense, lazy loading, useSuspenseQuery, file organization with features directory, MUI v7 styling, TanStack Router, performance optimization, and TypeScript best practices. Use when creating components, pages, features, fetching data, styling, routing, or working with frontend code.
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description: Opinionated frontend development standards for modern React + TypeScript applications. Covers Suspense-first data fetching, lazy loading, feature-based architecture, MUI v7 styling, TanStack Router, performance optimization, and strict TypeScript practices.
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---
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# Frontend Development Guidelines
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## Purpose
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**(React · TypeScript · Suspense-First · Production-Grade)**
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Comprehensive guide for modern React development, emphasizing Suspense-based data fetching, lazy loading, proper file organization, and performance optimization.
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You are a **senior frontend engineer** operating under strict architectural and performance standards.
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## When to Use This Skill
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Your goal is to build **scalable, predictable, and maintainable React applications** using:
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- Creating new components or pages
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- Building new features
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- Fetching data with TanStack Query
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- Setting up routing with TanStack Router
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- Styling components with MUI v7
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- Performance optimization
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- Organizing frontend code
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- TypeScript best practices
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* Suspense-first data fetching
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* Feature-based code organization
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* Strict TypeScript discipline
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* Performance-safe defaults
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This skill defines **how frontend code must be written**, not merely how it *can* be written.
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---
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## Quick Start
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## 1. Frontend Feasibility & Complexity Index (FFCI)
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Before implementing a component, page, or feature, assess feasibility.
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### FFCI Dimensions (1–5)
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| Dimension | Question |
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| --------------------- | ---------------------------------------------------------------- |
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| **Architectural Fit** | Does this align with feature-based structure and Suspense model? |
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| **Complexity Load** | How complex is state, data, and interaction logic? |
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| **Performance Risk** | Does it introduce rendering, bundle, or CLS risk? |
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| **Reusability** | Can this be reused without modification? |
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| **Maintenance Cost** | How hard will this be to reason about in 6 months? |
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### Score Formula
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```
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FFCI = (Architectural Fit + Reusability + Performance) − (Complexity + Maintenance Cost)
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```
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**Range:** `-5 → +15`
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### Interpretation
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| FFCI | Meaning | Action |
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| --------- | ---------- | ----------------- |
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| **10–15** | Excellent | Proceed |
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| **6–9** | Acceptable | Proceed with care |
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| **3–5** | Risky | Simplify or split |
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| **≤ 2** | Poor | Redesign |
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---
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## 2. Core Architectural Doctrine (Non-Negotiable)
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### 1. Suspense Is the Default
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* `useSuspenseQuery` is the **primary** data-fetching hook
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* No `isLoading` conditionals
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* No early-return spinners
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### 2. Lazy Load Anything Heavy
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* Routes
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* Feature entry components
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* Data grids, charts, editors
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* Large dialogs or modals
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### 3. Feature-Based Organization
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* Domain logic lives in `features/`
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* Reusable primitives live in `components/`
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* Cross-feature coupling is forbidden
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### 4. TypeScript Is Strict
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* No `any`
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* Explicit return types
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* `import type` always
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* Types are first-class design artifacts
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---
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## 3. When to Use This Skill
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Use **frontend-dev-guidelines** when:
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* Creating components or pages
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* Adding new features
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* Fetching or mutating data
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* Setting up routing
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* Styling with MUI
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* Addressing performance issues
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* Reviewing or refactoring frontend code
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---
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## 4. Quick Start Checklists
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### New Component Checklist
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Creating a component? Follow this checklist:
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* [ ] `React.FC<Props>` with explicit props interface
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* [ ] Lazy loaded if non-trivial
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* [ ] Wrapped in `<SuspenseLoader>`
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* [ ] Uses `useSuspenseQuery` for data
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* [ ] No early returns
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* [ ] Handlers wrapped in `useCallback`
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* [ ] Styles inline if <100 lines
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* [ ] Default export at bottom
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* [ ] Uses `useMuiSnackbar` for feedback
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- [ ] Use `React.FC<Props>` pattern with TypeScript
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- [ ] Lazy load if heavy component: `React.lazy(() => import())`
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- [ ] Wrap in `<SuspenseLoader>` for loading states
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- [ ] Use `useSuspenseQuery` for data fetching
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- [ ] Import aliases: `@/`, `~types`, `~components`, `~features`
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- [ ] Styles: Inline if <100 lines, separate file if >100 lines
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- [ ] Use `useCallback` for event handlers passed to children
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- [ ] Default export at bottom
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- [ ] No early returns with loading spinners
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- [ ] Use `useMuiSnackbar` for user notifications
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---
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### New Feature Checklist
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Creating a feature? Set up this structure:
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- [ ] Create `features/{feature-name}/` directory
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- [ ] Create subdirectories: `api/`, `components/`, `hooks/`, `helpers/`, `types/`
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- [ ] Create API service file: `api/{feature}Api.ts`
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- [ ] Set up TypeScript types in `types/`
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- [ ] Create route in `routes/{feature-name}/index.tsx`
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- [ ] Lazy load feature components
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- [ ] Use Suspense boundaries
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- [ ] Export public API from feature `index.ts`
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* [ ] Create `features/{feature-name}/`
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* [ ] Subdirs: `api/`, `components/`, `hooks/`, `helpers/`, `types/`
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* [ ] API layer isolated in `api/`
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* [ ] Public exports via `index.ts`
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* [ ] Feature entry lazy loaded
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* [ ] Suspense boundary at feature level
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* [ ] Route defined under `routes/`
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---
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## Import Aliases Quick Reference
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## 5. Import Aliases (Required)
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| Alias | Resolves To | Example |
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|-------|-------------|---------|
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| `@/` | `src/` | `import { apiClient } from '@/lib/apiClient'` |
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| `~types` | `src/types` | `import type { User } from '~types/user'` |
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| `~components` | `src/components` | `import { SuspenseLoader } from '~components/SuspenseLoader'` |
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| `~features` | `src/features` | `import { authApi } from '~features/auth'` |
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| Alias | Path |
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| ------------- | ---------------- |
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| `@/` | `src/` |
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| `~types` | `src/types` |
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| `~components` | `src/components` |
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| `~features` | `src/features` |
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Defined in: [vite.config.ts](../../vite.config.ts) lines 180-185
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Aliases must be used consistently. Relative imports beyond one level are discouraged.
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---
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## Common Imports Cheatsheet
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## 6. Component Standards
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```typescript
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// React & Lazy Loading
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import React, { useState, useCallback, useMemo } from 'react';
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const Heavy = React.lazy(() => import('./Heavy'));
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### Required Structure Order
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// MUI Components
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import { Box, Paper, Typography, Button, Grid } from '@mui/material';
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import type { SxProps, Theme } from '@mui/material';
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1. Types / Props
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2. Hooks
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3. Derived values (`useMemo`)
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4. Handlers (`useCallback`)
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5. Render
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6. Default export
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// TanStack Query (Suspense)
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import { useSuspenseQuery, useQueryClient } from '@tanstack/react-query';
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### Lazy Loading Pattern
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// TanStack Router
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import { createFileRoute } from '@tanstack/react-router';
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// Project Components
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import { SuspenseLoader } from '~components/SuspenseLoader';
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// Hooks
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import { useAuth } from '@/hooks/useAuth';
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import { useMuiSnackbar } from '@/hooks/useMuiSnackbar';
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// Types
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import type { Post } from '~types/post';
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```ts
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const HeavyComponent = React.lazy(() => import('./HeavyComponent'));
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```
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---
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## Topic Guides
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### 🎨 Component Patterns
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**Modern React components use:**
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- `React.FC<Props>` for type safety
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- `React.lazy()` for code splitting
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- `SuspenseLoader` for loading states
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- Named const + default export pattern
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**Key Concepts:**
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- Lazy load heavy components (DataGrid, charts, editors)
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- Always wrap lazy components in Suspense
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- Use SuspenseLoader component (with fade animation)
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- Component structure: Props → Hooks → Handlers → Render → Export
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**[📖 Complete Guide: resources/component-patterns.md](resources/component-patterns.md)**
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Always wrapped in `<SuspenseLoader>`.
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---
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### 📊 Data Fetching
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## 7. Data Fetching Doctrine
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**PRIMARY PATTERN: useSuspenseQuery**
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- Use with Suspense boundaries
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- Cache-first strategy (check grid cache before API)
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- Replaces `isLoading` checks
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- Type-safe with generics
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### Primary Pattern
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**API Service Layer:**
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- Create `features/{feature}/api/{feature}Api.ts`
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- Use `apiClient` axios instance
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- Centralized methods per feature
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- Route format: `/form/route` (NOT `/api/form/route`)
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* `useSuspenseQuery`
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* Cache-first
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* Typed responses
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**[📖 Complete Guide: resources/data-fetching.md](resources/data-fetching.md)**
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### Forbidden Patterns
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❌ `isLoading`
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❌ manual spinners
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❌ fetch logic inside components
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❌ API calls without feature API layer
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### API Layer Rules
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* One API file per feature
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* No inline axios calls
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* No `/api/` prefix in routes
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---
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### 📁 File Organization
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## 8. Routing Standards (TanStack Router)
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**features/ vs components/:**
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- `features/`: Domain-specific (posts, comments, auth)
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- `components/`: Truly reusable (SuspenseLoader, CustomAppBar)
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**Feature Subdirectories:**
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```
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features/
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my-feature/
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api/ # API service layer
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components/ # Feature components
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hooks/ # Custom hooks
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helpers/ # Utility functions
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types/ # TypeScript types
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```
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**[📖 Complete Guide: resources/file-organization.md](resources/file-organization.md)**
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---
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### 🎨 Styling
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**Inline vs Separate:**
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- <100 lines: Inline `const styles: Record<string, SxProps<Theme>>`
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- >100 lines: Separate `.styles.ts` file
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**Primary Method:**
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- Use `sx` prop for MUI components
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- Type-safe with `SxProps<Theme>`
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- Theme access: `(theme) => theme.palette.primary.main`
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**MUI v7 Grid:**
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```typescript
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<Grid size={{ xs: 12, md: 6 }}> // ✅ v7 syntax
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<Grid xs={12} md={6}> // ❌ Old syntax
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```
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**[📖 Complete Guide: resources/styling-guide.md](resources/styling-guide.md)**
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---
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### 🛣️ Routing
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**TanStack Router - Folder-Based:**
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- Directory: `routes/my-route/index.tsx`
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- Lazy load components
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- Use `createFileRoute`
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- Breadcrumb data in loader
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**Example:**
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```typescript
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import { createFileRoute } from '@tanstack/react-router';
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import { lazy } from 'react';
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const MyPage = lazy(() => import('@/features/my-feature/components/MyPage'));
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* Folder-based routing only
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* Lazy load route components
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* Breadcrumb metadata via loaders
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```ts
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export const Route = createFileRoute('/my-route/')({
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component: MyPage,
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loader: () => ({ crumb: 'My Route' }),
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component: MyPage,
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loader: () => ({ crumb: 'My Route' }),
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});
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```
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**[📖 Complete Guide: resources/routing-guide.md](resources/routing-guide.md)**
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---
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### ⏳ Loading & Error States
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## 9. Styling Standards (MUI v7)
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**CRITICAL RULE: No Early Returns**
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### Inline vs Separate
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```typescript
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// ❌ NEVER - Causes layout shift
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if (isLoading) {
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return <LoadingSpinner />;
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}
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* `<100 lines`: inline `sx`
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* `>100 lines`: `{Component}.styles.ts`
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// ✅ ALWAYS - Consistent layout
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<SuspenseLoader>
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<Content />
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</SuspenseLoader>
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### Grid Syntax (v7 Only)
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```tsx
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<Grid size={{ xs: 12, md: 6 }} /> // ✅
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<Grid xs={12} md={6} /> // ❌
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```
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**Why:** Prevents Cumulative Layout Shift (CLS), better UX
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**Error Handling:**
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- Use `useMuiSnackbar` for user feedback
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- NEVER `react-toastify`
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- TanStack Query `onError` callbacks
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**[📖 Complete Guide: resources/loading-and-error-states.md](resources/loading-and-error-states.md)**
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Theme access must always be type-safe.
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---
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### ⚡ Performance
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## 10. Loading & Error Handling
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**Optimization Patterns:**
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- `useMemo`: Expensive computations (filter, sort, map)
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- `useCallback`: Event handlers passed to children
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- `React.memo`: Expensive components
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- Debounced search (300-500ms)
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- Memory leak prevention (cleanup in useEffect)
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### Absolute Rule
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**[📖 Complete Guide: resources/performance.md](resources/performance.md)**
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❌ Never return early loaders
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✅ Always rely on Suspense boundaries
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### User Feedback
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* `useMuiSnackbar` only
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* No third-party toast libraries
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---
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### 📘 TypeScript
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## 11. Performance Defaults
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**Standards:**
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- Strict mode, no `any` type
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- Explicit return types on functions
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- Type imports: `import type { User } from '~types/user'`
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- Component prop interfaces with JSDoc
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* `useMemo` for expensive derivations
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* `useCallback` for passed handlers
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* `React.memo` for heavy pure components
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* Debounce search (300–500ms)
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* Cleanup effects to avoid leaks
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**[📖 Complete Guide: resources/typescript-standards.md](resources/typescript-standards.md)**
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Performance regressions are bugs.
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---
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### 🔧 Common Patterns
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## 12. TypeScript Standards
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**Covered Topics:**
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- React Hook Form with Zod validation
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- DataGrid wrapper contracts
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- Dialog component standards
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- `useAuth` hook for current user
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- Mutation patterns with cache invalidation
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**[📖 Complete Guide: resources/common-patterns.md](resources/common-patterns.md)**
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* Strict mode enabled
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* No implicit `any`
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* Explicit return types
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* JSDoc on public interfaces
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* Types colocated with feature
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---
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### 📚 Complete Examples
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**Full working examples:**
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- Modern component with all patterns
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- Complete feature structure
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- API service layer
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- Route with lazy loading
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- Suspense + useSuspenseQuery
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- Form with validation
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**[📖 Complete Guide: resources/complete-examples.md](resources/complete-examples.md)**
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---
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## Navigation Guide
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| Need to... | Read this resource |
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|------------|-------------------|
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| Create a component | [component-patterns.md](resources/component-patterns.md) |
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| Fetch data | [data-fetching.md](resources/data-fetching.md) |
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| Organize files/folders | [file-organization.md](resources/file-organization.md) |
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| Style components | [styling-guide.md](resources/styling-guide.md) |
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| Set up routing | [routing-guide.md](resources/routing-guide.md) |
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| Handle loading/errors | [loading-and-error-states.md](resources/loading-and-error-states.md) |
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| Optimize performance | [performance.md](resources/performance.md) |
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| TypeScript types | [typescript-standards.md](resources/typescript-standards.md) |
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| Forms/Auth/DataGrid | [common-patterns.md](resources/common-patterns.md) |
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| See full examples | [complete-examples.md](resources/complete-examples.md) |
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---
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## Core Principles
|
||||
|
||||
1. **Lazy Load Everything Heavy**: Routes, DataGrid, charts, editors
|
||||
2. **Suspense for Loading**: Use SuspenseLoader, not early returns
|
||||
3. **useSuspenseQuery**: Primary data fetching pattern for new code
|
||||
4. **Features are Organized**: api/, components/, hooks/, helpers/ subdirs
|
||||
5. **Styles Based on Size**: <100 inline, >100 separate
|
||||
6. **Import Aliases**: Use @/, ~types, ~components, ~features
|
||||
7. **No Early Returns**: Prevents layout shift
|
||||
8. **useMuiSnackbar**: For all user notifications
|
||||
|
||||
---
|
||||
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## Quick Reference: File Structure
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||||
## 13. Canonical File Structure
|
||||
|
||||
```
|
||||
src/
|
||||
features/
|
||||
my-feature/
|
||||
api/
|
||||
myFeatureApi.ts # API service
|
||||
components/
|
||||
MyFeature.tsx # Main component
|
||||
SubComponent.tsx # Related components
|
||||
hooks/
|
||||
useMyFeature.ts # Custom hooks
|
||||
useSuspenseMyFeature.ts # Suspense hooks
|
||||
helpers/
|
||||
myFeatureHelpers.ts # Utilities
|
||||
types/
|
||||
index.ts # TypeScript types
|
||||
index.ts # Public exports
|
||||
index.ts
|
||||
|
||||
components/
|
||||
SuspenseLoader/
|
||||
SuspenseLoader.tsx # Reusable loader
|
||||
CustomAppBar/
|
||||
CustomAppBar.tsx # Reusable app bar
|
||||
|
||||
routes/
|
||||
my-route/
|
||||
index.tsx # Route component
|
||||
create/
|
||||
index.tsx # Nested route
|
||||
index.tsx
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Modern Component Template (Quick Copy)
|
||||
## 14. Canonical Component Template
|
||||
|
||||
```typescript
|
||||
```ts
|
||||
import React, { useState, useCallback } from 'react';
|
||||
import { Box, Paper } from '@mui/material';
|
||||
import { useSuspenseQuery } from '@tanstack/react-query';
|
||||
@@ -356,44 +286,74 @@ import { featureApi } from '../api/featureApi';
|
||||
import type { FeatureData } from '~types/feature';
|
||||
|
||||
interface MyComponentProps {
|
||||
id: number;
|
||||
onAction?: () => void;
|
||||
id: number;
|
||||
onAction?: () => void;
|
||||
}
|
||||
|
||||
export const MyComponent: React.FC<MyComponentProps> = ({ id, onAction }) => {
|
||||
const [state, setState] = useState<string>('');
|
||||
const [state, setState] = useState('');
|
||||
|
||||
const { data } = useSuspenseQuery({
|
||||
queryKey: ['feature', id],
|
||||
queryFn: () => featureApi.getFeature(id),
|
||||
});
|
||||
const { data } = useSuspenseQuery<FeatureData>({
|
||||
queryKey: ['feature', id],
|
||||
queryFn: () => featureApi.getFeature(id),
|
||||
});
|
||||
|
||||
const handleAction = useCallback(() => {
|
||||
setState('updated');
|
||||
onAction?.();
|
||||
}, [onAction]);
|
||||
const handleAction = useCallback(() => {
|
||||
setState('updated');
|
||||
onAction?.();
|
||||
}, [onAction]);
|
||||
|
||||
return (
|
||||
<Box sx={{ p: 2 }}>
|
||||
<Paper sx={{ p: 3 }}>
|
||||
{/* Content */}
|
||||
</Paper>
|
||||
</Box>
|
||||
);
|
||||
return (
|
||||
<Box sx={{ p: 2 }}>
|
||||
<Paper sx={{ p: 3 }}>
|
||||
{/* Content */}
|
||||
</Paper>
|
||||
</Box>
|
||||
);
|
||||
};
|
||||
|
||||
export default MyComponent;
|
||||
```
|
||||
|
||||
For complete examples, see [resources/complete-examples.md](resources/complete-examples.md)
|
||||
---
|
||||
|
||||
## 15. Anti-Patterns (Immediate Rejection)
|
||||
|
||||
❌ Early loading returns
|
||||
❌ Feature logic in `components/`
|
||||
❌ Shared state via prop drilling instead of hooks
|
||||
❌ Inline API calls
|
||||
❌ Untyped responses
|
||||
❌ Multiple responsibilities in one component
|
||||
|
||||
---
|
||||
|
||||
## Related Skills
|
||||
## 16. Integration With Other Skills
|
||||
|
||||
- **error-tracking**: Error tracking with Sentry (applies to frontend too)
|
||||
- **backend-dev-guidelines**: Backend API patterns that frontend consumes
|
||||
* **frontend-design** → Visual systems & aesthetics
|
||||
* **page-cro** → Layout hierarchy & conversion logic
|
||||
* **analytics-tracking** → Event instrumentation
|
||||
* **backend-dev-guidelines** → API contract alignment
|
||||
* **error-tracking** → Runtime observability
|
||||
|
||||
---
|
||||
|
||||
**Skill Status**: Modular structure with progressive loading for optimal context management
|
||||
## 17. Operator Validation Checklist
|
||||
|
||||
Before finalizing code:
|
||||
|
||||
* [ ] FFCI ≥ 6
|
||||
* [ ] Suspense used correctly
|
||||
* [ ] Feature boundaries respected
|
||||
* [ ] No early returns
|
||||
* [ ] Types explicit and correct
|
||||
* [ ] Lazy loading applied
|
||||
* [ ] Performance safe
|
||||
|
||||
---
|
||||
|
||||
## 18. Skill Status
|
||||
|
||||
**Status:** Stable, opinionated, and enforceable
|
||||
**Intended Use:** Production React codebases with long-term maintenance horizons
|
||||
|
||||
|
||||
Reference in New Issue
Block a user