How can I implement logging using TypeScript decorators?

How can I implement logging using TypeScript decorators?

You can create a logging decorator in TypeScript by defining a function that takes a target, property key, and descriptor.

Can you show me a simple example of such a 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 use this decorator in a class?

You can use the decorator by applying it to a method in your class like this:

class Example {
    @Log
    myMethod(arg1: string, arg2: number) {
        // method implementation
    }
}

What if I want to log the return value as well?

You can modify the decorator to log the return value by adding a console log after the original method call.