Mastering TypeScript 3 - Third Edition

Decorator factories

In order to allow for decorators to accept parameters, we need to use what is known as a decorator factory. A decorator factory is simply a wrapper function that returns the decorator function itself. As an example of this, consider the following code:

function decoratorFactory(name: string) { 
    return function (constructor : Function ) { 
        console.log(`decorator function called with : ${name}`); 
    } 
} 

Here, we have defined a function named decoratorFactory that accepts a single argument, named name, of type string. This function simply returns an anonymous decorator function that takes a single argument named constructor of type Function. The anonymous function (our decorator function) logs the value of the name parameter ...