TypeScript Patterns Skill

Best practices for types, interfaces, assertions, and type safety.

Type Inference Over Explicit Returns

// ✅ Inferred return type
function calculateTotal(items: OrderItem[]) {
    return items.reduce((sum, item) => sum + item.price, 0);
}

// ❌ Explicit return type
function calculateTotal(items: OrderItem[]): number {
    return items.reduce((sum, item) => sum + item.price, 0);
}

Why: Inference catches implicit type coercion bugs.