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---
title: Guide de style
icon: paintbrush
description: Conventions de code et bonnes pratiques pour contribuer à Twenty.
---
## React
### Composants fonctionnels uniquement
Utilisez toujours des composants fonctionnels TSX avec des exports nommés.
```tsx
// ❌ Bad
const MyComponent = () => {
return <div>Hello World</div>;
};
export default MyComponent;
// ✅ Good
export function MyComponent() {
return <div>Hello World</div>;
};
```
### Propriétés
Créez un type nommé `{ComponentName}Props`. Utilisez la déstructuration. N'utilisez pas `React.FC`.
```tsx
type MyComponentProps = {
name: string;
};
export const MyComponent = ({ name }: MyComponentProps) => <div>Hello {name}</div>;
```
### Pas de propagation de props à partir d'une seule variable
```tsx
// ❌ Bad
const MyComponent = (props: MyComponentProps) => <Other {...props} />;
// ✅ Good
const MyComponent = ({ prop1, prop2 }: MyComponentProps) => <Other {...{ prop1, prop2 }} />;
```
## Gestion de l'état
### Atomes Jotai pour l'état global
```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',
});
```
* Préférez les atomes au prop drilling
* N'utilisez pas `useRef` pour l'état — utilisez `useState` ou des atomes
* Utilisez les familles d'atomes et les sélecteurs pour les listes
### Évitez les re-renders inutiles
* Extrayez `useEffect` et la récupération de données dans des composants sidecar frères
* Préférez les gestionnaires d'événements (`handleClick`, `handleChange`) à `useEffect`
* N'utilisez pas `React.memo()` — corrigez plutôt la cause première
* Limitez l'utilisation de `useCallback` ou `useMemo`
```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
* **`type` plutôt que `interface`** — plus flexible, plus facile à composer
* **Littéraux de chaîne plutôt que enums** — sauf pour les enums générés par GraphQL codegen et les API internes des bibliothèques
* **Pas de `any`** — TypeScript strict appliqué
* **Pas d'importations de types** — utilisez des importations classiques (imposées par Oxlint `typescript/consistent-type-imports`)
* **Utilisez [Zod](https://github.com/colinhacks/zod)** pour la validation à l'exécution des objets non typés
## JavaScript
```tsx
// Use nullish-coalescing (??) instead of ||
const value = process.env.MY_VALUE ?? 'default';
// Use optional chaining
onClick?.();
```
## Nommage
* **Variables**: camelCase, explicites (`email` et non `value`, `fieldMetadata` et non `fm`)
* **Constantes**: SCREAMING_SNAKE_CASE
* **Types/Classes**: PascalCase
* **Fichiers/répertoires**: kebab-case (`.component.tsx`, `.service.ts`, `.entity.ts`)
* **Gestionnaires d'événements**: `handleClick` (pas `onClick` pour la fonction gestionnaire)
* **Props de composant**: préfixez avec le nom du composant (`ButtonProps`)
* **Composants stylés**: préfixez avec `Styled` (`StyledTitle`)
## Stylisation
Utilisez les composants stylés [Linaria](https://github.com/callstack/linaria). Utilisez les valeurs du thème — évitez les `px`, `rem` ou couleurs en dur.
```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)};
`;
```
## Imports
Utilisez des alias au lieu de chemins relatifs:
```tsx
// ❌ Bad
import { Foo } from '../../../../../testing/decorators/Foo';
// ✅ Good
import { Foo } from '~/testing/decorators/Foo';
import { Bar } from '@/modules/bar/components/Bar';
```
## Structure des dossiers
```
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, ...)
```
* Les modules peuvent importer depuis d'autres modules, mais `ui/` doit rester sans dépendances
* Utilisez des sous-dossiers `internal/` pour le code privé au module
* Composants de moins de 300 lignes, services de moins de 500 lignes