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coding-standards

TypeScript, JavaScript, React, Node.js 개발을 위한 범용 코딩 표준, 모범 사례 및 패턴.

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name coding-standards description TypeScript, JavaScript, React, Node.js 개발을 위한 범용 코딩 표준, 모범 사례 및 패턴. origin ECC 코딩 표준 및 모범 사례 모든 프로젝트에 적용 가능한 범용 코딩 표준. 활성화 시점 새 프로젝트 또는 모듈을 시작할 때 코드 품질 및 유지보수성을 검토할 때 기존 코드를 컨벤션에 맞게 리팩터링할 때 네이밍, 포맷팅 또는 구조적 일관성을 적용할 때 린팅, 포맷팅 또는 타입 검사 규칙을 설정할 때 새 기여자에게 코딩 컨벤션을 안내할 때 코드 품질 원칙 1. 가독성 우선 코드는 작성보다 읽히는 횟수가 더 많다 명확한 변수 및 함수 이름 사용 주석보다 자기 문서화 코드를 선호 일관된 포맷팅 유지 2. KISS (Keep It Simple, Stupid) 동작하는 가장 단순한 해결책 과도한 엔지니어링 지양 조기 최적화 금지 이해하기 쉬운 코드 > 영리한 코드 3. DRY (Don't Repeat Yourself) 공통 로직을 함수로 추출 재사용 가능한 컴포넌트 생성 모듈 간 유틸리티 공유 복사-붙여넣기 프로그래밍 지양 4. YAGNI (You Aren't Gonna Need It) 필요하기 전에 기능을 만들지 않기 추측에 의한 일반화 지양 필요할 때만 복잡성 추가 단순하게 시작하고 필요할 때 리팩터링 TypeScript/JavaScript 표준 변수 네이밍 // PASS: GOOD: Descriptive names const marketSearchQuery = 'election' const isUserAuthenticated = true const totalRevenue = 1000 // FAIL: BAD: Unclear names const q = 'election' const flag = true const x = 1000 함수 네이밍 // PASS: GOOD: Verb-noun pattern async function fetchMarketData ( marketId : string ) { } function calculateSimilarity ( a : number [], b : number [] ) { } function isValidEmail ( email : string ): boolean { } // FAIL: BAD: Unclear or noun-only async function market ( id : string ) { } function similarity ( a, b ) { } function email ( e ) { } 불변성 패턴 (필수) // PASS: ALWAYS use spread operator const updatedUser = { ...user, name : 'New Name' } const updatedArray = [...items, newItem] // FAIL: NEVER mutate directly user. name = 'New Name' // BAD items. push (newItem) // BAD 에러 처리 // PASS: GOOD: Comprehensive error handling async function fetchData ( url : string ) { try { const response = await fetch (url) if (!response. ok ) { throw new Error ( `HTTP ${response.status} : ${response.statusText} ` ) } return await response. json () } catch (error) { console . error ( 'Fetch failed:' , error) throw new Error ( 'Failed to fetch data' ) } } // FAIL: BAD: No error handling async function fetchData ( url ) { const response = await fetch (url) return response. json () } Async/Await 모범 사례 // PASS: GOOD: Parallel execution when possible const [users, markets, stats] = await Promise . all ([ fetchUsers (), fetchMarkets (), fetchStats () ]) // FAIL: BAD: Sequential when unnecessary const users = await fetchUsers () const markets = await fetchMarkets () const stats = await fetchStats () 타입 안전성 // PASS: GOOD: Proper types interface Market { id : string name : string status : 'active' | 'resolved' | 'closed' created_at : Date } function getMarket ( id : string ): Promise < Market > { // Implementation } // FAIL: BAD: Using 'any' function getMarket ( id : any ): Promise < any > { // Implementation } React 모범 사례 컴포넌트 구조 // PASS: GOOD: Functional component with types interface ButtonProps { children : React . ReactNode onClick : () => void disabled ?: boolean variant ?: 'primary' | 'secondary' } export function Button ( { children, onClick, disabled = false , variant = 'primary' }: ButtonProps ) { return ( < button onClick = {onClick} disabled = {disabled} className = { ` btn btn- ${ variant }`} > {children} </ button > ) } // FAIL: BAD: No types, unclear structure export function Button ( props ) { return < button onClick = {props.onClick} > {props.children} </ button > } 커스텀 Hook // PASS: GOOD: Reusable custom hook export function useDebounce<T>( value : T, delay : number ): T { const [debouncedValue, setDebouncedValue] = useState<T>(value) useEffect ( () => { const handler = setTimeout ( () => { setDebouncedValue (value) }, delay) return () => clearTimeout (handler) }, [value, delay]) return debouncedValue } // Usage const debouncedQuery = useDebounce (searchQuery, 500 ) 상태 관리 // PASS: GOOD: Proper state updates const [count, setCount] = useState ( 0 ) // Functional update for state based on previous state setCount ( prev => prev + 1 ) // FAIL: BAD: Direct state reference setCount (count + 1 ) // Can be stale in async scenarios 조건부 렌더링 // PASS: GOOD: Clear conditional rendering {isLoading && < Spinner /> } {error && < ErrorMessage error = {error} /> } {data && < DataDisplay data = {data} /> } // FAIL: BAD: Ternary hell {isLoading ? < Spinner /> : error ? < ErrorMessage error = {error} /> : data ? < DataDisplay data = {data} /> : null } API 설계 표준 REST API 컨벤션 GET /api/markets # List all markets GET /api/markets/:id # Get specific market POST /api/markets # Create new market PUT /api/markets/:id # Update market (full) PATCH /api/markets/:id # Update market (partial) DELETE /api/markets/:id # Delete market # Query parameters for filtering GET /api/markets?status=active&limit=10&offset=0 응답 형식 // PASS: GOOD: Consistent response structure interface ApiResponse <T> { success : boolean data ?: T error ?: string meta ?: { total : number page : number limit : number } } // Success response return NextResponse . json ({ success : true , data : markets, meta : { total : 100 , page : 1 , limit : 10 } }) // Error response return NextResponse . json ({ success : false , error : 'Invalid request' }, { status : 400 }) 입력 유효성 검사 import { z } from 'zod' // PASS: GOOD: Schema validation const CreateMarketSchema = z. object ({ name : z. string (). min ( 1 ). max ( 200 ), description : z. string (). min ( 1 ). max ( 2000 ), endDate : z. string (). datetime (), categories : z. array (z. string ()). min ( 1 ) }) export async function POST ( request : Request ) { const body = await request. json () try { const validated = CreateMarketSchema . parse (body) // Proceed with validated data } catch (error) { if (error instanceof z. ZodError ) { return NextResponse . json ({ success : false , error : 'Validation failed' , details : error. errors }, { status : 400 }) } } } 파일 구성 프로젝트 구조 src/ ├── app/ # Next.js App Router │ ├── api/ # API routes │ ├── markets/ # Market pages │ └── (auth)/ # Auth pages (route groups) ├── components/ # React components │ ├── ui/ # Generic UI components │ ├── forms/ # Form components │ └── layouts/ # Layout components ├── hooks/ # Custom React hooks ├── lib/ # Utilities and configs │ ├── api/ # API clients │ ├── utils/ # Helper functions │ └── constants/ # Constants ├── types/ # TypeScript types └── styles/ # Global styles 파일 네이밍 components/Button.tsx # PascalCase for components hooks/useAuth.ts # camelCase with 'use' prefix lib/formatDate.ts # camelCase for utilities types/market.types.ts # camelCase with .types suffix 주석 및 문서화 주석을 작성해야 하는 경우 // PASS: GOOD: Explain WHY, not WHAT // Use exponential backoff to avoid overwhelming the API during outages const delay = Math . min ( 1000 * Math . pow ( 2 , retryCount), 30000 ) // Deliberately using mutation here for performance with large arrays items. push (newItem) // FAIL: BAD: Stating the obvious // Increment counter by 1 count++ // Set name to user's name name = user. name 공개 API를 위한 JSDoc /** * Searches markets using semantic similarity. * * @param query - Natural language search query * @param limit - Maximum number of results (default: 10) * @returns Array of markets sorted by similarity score * @throws { Error } If OpenAI API fails or Redis unavailable * * @example * ```typescript * const results = await searchMarkets('election', 5) * console.log(results[0].name) // "Trump vs Biden" * ``` */ export async function searchMarkets ( query : string , limit : number = 10 ): Promise < Market []> { // Implementation } 성능 모범 사례 메모이제이션 import { useMemo, useCallback } from 'react' // PASS: GOOD: Memoize expensive computations const sortedMarkets = useMemo ( () => { return [...markets]. sort ( ( a, b ) => b. volume - a. volume ) }, [markets]) // PASS: GOOD: Memoize callbacks const handleSearch = useCallback ( ( query : string ) => { setSearchQuery (query) }, []) 지연 로딩 import { lazy, Suspense } from 'react' // PASS: GOOD: Lazy load heavy components const HeavyChart = lazy ( () => import ( './HeavyChart' )) export function Dashboard ( ) { return ( < Suspense fallback = { < Spinner /> }> < HeavyChart /> </ Suspense > ) } 데이터베이스 쿼리 // PASS: GOOD: Select only needed columns const { data } = await supabase . from ( 'markets' ) . select ( 'id, name, status' ) . limit ( 10 ) // FAIL: BAD: Select everything const { data } = await supabase . from ( 'markets' ) . select ( '*' ) 테스트 표준 테스트 구조 (AAA 패턴) test ( 'calculates similarity correctly' , () => { // Arrange const vector1 = [ 1 , 0 , 0 ] const vector2 = [ 0 , 1 , 0 ] // Act const similarity = calculateCosineSimilarity (vector1, vector2) // Assert expect (similarity). toBe ( 0 ) }) 테스트 네이밍 // PASS: GOOD: Descriptive test names test ( 'returns empty array when no markets match query' , () => { }) test ( 'throws error when OpenAI API key is missing' , () => { }) test ( 'falls back to substring search when Redis unavailable' , () => { }) // FAIL: BAD: Vague test names test ( 'works' , () => { }) test ( 'test search' , () => { }) 코드 스멜 감지 다음 안티패턴을 주의하세요: 1. 긴 함수 // FAIL: BAD: Function > 50 lines function processMarketData ( ) { // 100 lines of code } // PASS: GOOD: Split into smaller functions function processMarketData ( ) { const validated = validateData () const transformed = transformData (validated) return saveData (transformed) } 2. 깊은 중첩 // FAIL: BAD: 5+ levels of nesting if (user) { if (user. isAdmin ) { if (market) { if (market. isActive ) { if (hasPermission) { // Do something } } } } } // PASS: GOOD: Early returns if (!user) return if (!user. isAdmin ) return if (!market) return if (!market. isActive ) return if (!hasPermission) return // Do something 3. 매직 넘버 // FAIL: BAD: Unexplained numbers if (retryCount > 3 ) { } setTimeout (callback, 500 ) // PASS: GOOD: Named constants const MAX_RETRIES = 3 const DEBOUNCE_DELAY_MS = 500 if (retryCount > MAX_RETRIES ) { } setTimeout (callback, DEBOUNCE_DELAY_MS ) 기억하세요 : 코드 품질은 타협할 수 없습니다. 명확하고 유지보수 가능한 코드가 빠른 개발과 자신감 있는 리팩터링을 가능하게 합니다.
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