How do I create a decorator in TypeScript?

How do I create a decorator in TypeScript?

To create a decorator in TypeScript, you define a function that takes a target, property key, and descriptor.

Can you give me an example of a simple method decorator?

Sure! Here's a basic example:

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

How do I apply this decorator to a method?

You can apply the decorator by prefixing the method with @Log like this:

class Example {
    @Log
    sayHello(name: string) {
        return `Hello, ${name}!`;
    }
}

What are the different types of decorators in TypeScript?

In TypeScript, there are three main types of decorators: class decorators, method decorators, and property decorators.