What are the best practices for using decorators in TypeScript?

What are the best practices for using decorators in TypeScript?

When using decorators in TypeScript, it's important to follow a few best practices: 1. Keep decorators simple and focused. 2. Use them for cross-cutting concerns like logging or validation. 3. Avoid side effects in decorators to maintain predictability.

Can you give an example of a simple logging decorator?

Sure! Here's a simple logging decorator:

function Log(target: any, propertyName: string, descriptor: PropertyDescriptor) {
    const originalMethod = descriptor.value;
    descriptor.value = function(...args: any[]) {
        console.log(`Calling ${propertyName} with`, args);
        return originalMethod.apply(this, args);
    };
}

What are some common pitfalls to avoid with decorators?

Common pitfalls include: 1. Overusing decorators, which can lead to complex code. 2. Not considering the order of decorators, as they can affect behavior. 3. Forgetting to handle the context of 'this' properly.

How do decorators affect performance?

Decorators can introduce some overhead, especially if they add complex logic or multiple layers of abstraction. It's best to use them judiciously and profile your application if performance is a concern.