Learning TypeScript 2.x - Second Edition

Decorators with arguments

We can use a special kind of decorator factory to allow developers to configure the behavior of a decorator. For example, we could pass a string to a class decorator as follows:

@logClass("option") 
class Person { 
// ... 

To be able to pass some parameters to a decorator, we need to wrap the decorator with a function. The wrapper function takes the options of our choice and returns a decorator:

function logClass(option: string) { 
    return function(target: any) { 
        // class decorator logic goes here 
        // we have access to the decorator parameters 
        console.log(target, option); 
    }; 
} 

This can be applied to all the kinds of decorators that you learned in this chapter.

It is very important to avoid using an arrow function as ...