What are advanced decorator patterns in TypeScript?

What are advanced decorator patterns in TypeScript?

Advanced decorator patterns in TypeScript allow you to modify classes and methods at design time, enhancing functionality.

Can you give me an example of a method decorator?

Sure! A method decorator can log the execution time of a method. Here's a simple example:

function LogExecutionTime(target: any, propertyName: string, descriptor: PropertyDescriptor) {
    const originalMethod = descriptor.value;
    descriptor.value = function(...args: any[]) {
        const start = performance.now();
        const result = originalMethod.apply(this, args);
        const end = performance.now();
        console.log(`Execution time for ${propertyName}: ${end - start} ms`);
        return result;
    };
}

How do I apply multiple decorators to a single method?

You can apply multiple decorators by stacking them above the method. For example:

@DecoratorOne
@DecoratorTwo
methodName() {
    // method implementation
}

What are some common use cases for decorators?

Common use cases include logging, access control, validation, and modifying method behavior in frameworks like Angular.