How do I create method decorators in TypeScript?

How do I create method decorators in TypeScript?

To create a method decorator in TypeScript, you define a function that takes three parameters: the target, the method name, and the descriptor.

Can you show me a simple example of a method decorator?

Sure! Here's a basic example:

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);
    };
}

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

This decorator logs the method call and its arguments.

What are the use cases for method decorators?

Method decorators can be used for logging, access control, validation, and modifying method behavior, among other things.

Can I use multiple decorators on a single method?

Yes, you can stack multiple decorators on a single method. They will be applied in the order they are defined.