TypeScript 2.x By Example

Method decorator

As with the class decorator, the method decorator is used to annotate methods and provide additional functionality. The following is the syntax of a method decorator:

function writable(target: Object, propertyKey: string, descriptor: PropertyDescriptor) { console.log(`Setting ${propertyKey}.`); descriptor.writable = true; }

A method decorator takes three parameters, unlike the class decorator which takes only one. The first parameter in a method decorator is the same as that of the class decorator, a reference to the constructor function if the method is static or a class prototype for the instance member. The second parameter is the name of the method that would be decorated. The third parameter is the property descriptor ...