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---
title: Stil Rehberi
icon: paintbrush
description: Twenty'ye katkıda bulunmak için kod kuralları ve en iyi uygulamalar.
---
## React
### Yalnızca fonksiyonel bileşenler
Her zaman named export'larla TSX fonksiyonel bileşenlerini kullanın.
```tsx
// ❌ Bad
const MyComponent = () => {
return <div>Hello World</div>;
};
export default MyComponent;
// ✅ Good
export function MyComponent() {
return <div>Hello World</div>;
};
```
### Özellikler
`{ComponentName}Props` adında bir type oluşturun. Destructuring kullanın. `React.FC` kullanmayın.
```tsx
type MyComponentProps = {
name: string;
};
export const MyComponent = ({ name }: MyComponentProps) => <div>Hello {name}</div>;
```
### Tek değişken için prop spread kullanmayın
```tsx
// ❌ Bad
const MyComponent = (props: MyComponentProps) => <Other {...props} />;
// ✅ Good
const MyComponent = ({ prop1, prop2 }: MyComponentProps) => <Other {...{ prop1, prop2 }} />;
```
## Durum Yönetimi
### Global durum için Jotai atomları
```tsx
import { createAtomState } from '@/ui/utilities/state/jotai/utils/createAtomState';
import { useAtomState } from '@/ui/utilities/state/jotai/hooks/useAtomState';
export const myAtomState = createAtomState<string>({
key: 'myAtomState',
defaultValue: 'default value',
});
```
* Prop drilling yerine atomları tercih edin
* Durum için `useRef` kullanmayın — `useState` veya atomları kullanın
* Listeler için atom ailelerini ve seçicileri kullanın
### Gereksiz yeniden render'ları önleyin
* `useEffect` ve veri çekmeyi kardeş sidecar bileşenlere ayırın
* `useEffect` yerine olay işleyicilerini (`handleClick`, `handleChange`) tercih edin
* `React.memo()` kullanmayın — bunun yerine kök nedeni düzeltin
* `useCallback` / `useMemo` kullanımını sınırlayın
```tsx
// ❌ Bad — useEffect in the same component causes re-renders
export const Page = () => {
const [data, setData] = useAtomState(dataState);
const [dep] = useAtomState(depState);
useEffect(() => { setData(dep); }, [dep]);
return <div>{data}</div>;
};
// ✅ Good — extract into sibling
export const PageData = () => {
const [data, setData] = useAtomState(dataState);
const [dep] = useAtomState(depState);
useEffect(() => { setData(dep); }, [dep]);
return <></>;
};
export const Page = () => {
const [data] = useAtomState(dataState);
return <div>{data}</div>;
};
```
## TypeScript
* **`interface` yerine `type`** — daha esnek, birleştirmesi daha kolay
* **enum yerine string literal'lar** — GraphQL codegen enum'ları ve dahili kütüphane API'leri hariç
* **`any` yok** — katı TypeScript zorunludur
* **Type import'ları yok** — normal import'lar kullanın (Oxlint `typescript/consistent-type-imports` tarafından uygulanır)
* **[Zod](https://github.com/colinhacks/zod) kullanın** tiplenmemiş nesnelerin çalışma zamanı doğrulaması için
## JavaScript
```tsx
// Use nullish-coalescing (??) instead of ||
const value = process.env.MY_VALUE ?? 'default';
// Use optional chaining
onClick?.();
```
## İsimlendirme
* **Değişkenler**: camelCase, açıklayıcı (`email` değil `value`, `fieldMetadata` değil `fm`)
* **Sabitler**: SCREAMING_SNAKE_CASE
* **Tipler/Sınıflar**: PascalCase
* **Dosyalar/dizinler**: kebab-case (`.component.tsx`, `.service.ts`, `.entity.ts`)
* **Olay işleyicileri**: `handleClick` (işleyici fonksiyon için `onClick` değil)
* **Bileşen prop'ları**: önek olarak bileşen adını kullanın (`ButtonProps`)
* **Styled bileşenler**: `Styled` öneğini kullanın (`StyledTitle`)
## Stil
[Linaria](https://github.com/callstack/linaria) ile stillendirilmiş bileşenleri kullanın. Tema değerlerini kullanın — kodda sabit tanımlanmış `px`, `rem` veya renklerden kaçının.
```tsx
// ❌ Bad
const StyledButton = styled.button`
color: #333333;
font-size: 1rem;
margin-left: 4px;
`;
// ✅ Good
const StyledButton = styled.button`
color: ${({ theme }) => theme.font.color.primary};
font-size: ${({ theme }) => theme.font.size.md};
margin-left: ${({ theme }) => theme.spacing(1)};
`;
```
## İçe Aktarımlar
Göreli yollar yerine alias kullanın:
```tsx
// ❌ Bad
import { Foo } from '../../../../../testing/decorators/Foo';
// ✅ Good
import { Foo } from '~/testing/decorators/Foo';
import { Bar } from '@/modules/bar/components/Bar';
```
## Klasör Yapısı
```
front
└── modules/ # Feature modules
│ └── module1/
│ ├── components/
│ ├── constants/
│ ├── contexts/
│ ├── graphql/ (fragments, queries, mutations)
│ ├── hooks/
│ ├── states/ (atoms, selectors)
│ ├── types/
│ └── utils/
└── pages/ # Route-level components
└── ui/ # Reusable UI components (display, input, feedback, ...)
```
* Modüller diğer modüllerden import edebilir, ancak `ui/` bağımlılıksız kalmalıdır
* `internal/` alt klasörlerini modüle özel kod için kullanın
* Bileşenler 300 satırın altında, servisler 500 satırın altında