Mode d’emploi
- Copiez la commande et examinez le paquet avant de l’installer dans votre environnement agent.
- Consultez le document original pour les outils, identifiants et environnements requis.
- Décrivez les entrées et le livrable souhaité ; comparez la sortie aux sources.
npx skills add https://github.com/j4flmao/agent_skills_nodejs_nestjs --skill designing-oop-typescriptAvant de commencer
- L’installation n’inclut ni abonnement au modèle, ni quota API, ni accès aux fichiers.
- Étoiles et installations reflètent l’activité, pas un test indépendant de qualité ou de sécurité.
Document Skill original
Rendu depuis le dépôt source en conservant titres, exemples, code, tableaux, liens et images.
Designing OOP TypeScript
When to use
- Creating new domain entities or value objects
- Refactoring procedural code into OOP
- Designing class hierarchies with SOLID principles
Core rules
- Classes over functions: all behavior encapsulated in classes
- Explicit access modifiers:
public,protected,privatealways written - SRP: one responsibility per class, split when growing
- Encapsulation: no public mutable fields, expose intent via methods
- Immutability: value objects are readonly, entities use private state
- SOLID: Single responsibility, Open/closed, Liskov, Interface segregation, Dependency inversion
Reference shape (TypeScript)
Domain Entity
typescript
export class User {
private constructor(
private readonly _id: string,
private _email: string,
private _isActive: boolean
) {}
static create(id: string, email: string): User {
return new User(id, email, true);
}
get id(): string { return this._id; }
get email(): string { return this._email; }
deactivate(): void {
if (!this._isActive) throw new BusinessError('ALREADY_INACTIVE', 'User already inactive');
this._isActive = false;
}
}Value Object
typescript
export class Email {
private constructor(private readonly value: string) {}
static create(email: string): Email {
if (!PATTERNS.EMAIL.test(email)) throw new ValidationError([{ field: 'email', message: 'Invalid' }]);
return new Email(email.toLowerCase());
}
equals(other: Email): boolean {
return this.value === other.value;
}
}Examples — Do
typescript
class Order {
private items: OrderItem[] = [];
addItem(item: OrderItem): void { this.items.push(item); }
get total(): number { return this.items.reduce((sum, i) => sum + i.price, 0); }
}Examples — Don't
typescript
// ❌ Function module, no encapsulation
export function createUser(id: string, email: string) { return { id, email }; }
// ❌ Public mutable fields
class User { id: string; email: string; }Checklist
- [ ] Classes with explicit access modifiers
- [ ] No public mutable fields
- [ ] Value objects are immutable
- [ ] Entities encapsulate behavior
- [ ] SOLID principles applied
See reference/oop-patterns.md for full patterns.
