What are the differences between decorators in TypeScript and JavaScript?

Can you explain the differences between decorators in TypeScript and JavaScript?

Sure! In TypeScript, decorators are a special kind of declaration that can be attached to a class, method, accessor, property, or parameter. They are used to modify the behavior of the entity they are attached to. In JavaScript, decorators are not natively supported, but you can use libraries like Babel to enable similar functionality.

What are some common use cases for decorators in TypeScript?

Common use cases for decorators in TypeScript include logging, access control, and validation. For example, you can create a logging decorator that logs method calls or a validation decorator that checks input parameters.

Can you give me an example of a simple decorator in TypeScript?

Certainly! 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);
    };
}