Decorators

gistfile1.txt

Class Decorator
A class decorator is applied to the entire class and has a single parameter.

function classDecorator(target: Function) {
  // target is the constructor function of the class
}

Method Decorator
A method decorator is applied to a method within a class and has three parameters.

function methodDecorator(target: Object, propertyKey: string | symbol, descriptor: PropertyDescriptor) {
  // target is the prototype of the class
  // propertyKey is the name of the method
  // descriptor is the property descriptor for the method
}

Accessor Decorator
An accessor decorator is applied to a getter or setter and has the same three parameters as a method decorator.

function accessorDecorator(target: Object, propertyKey: string | symbol, descriptor: PropertyDescriptor) {
  // target is the prototype of the class
  // propertyKey is the name of the accessor (getter or setter)
  // descriptor is the property descriptor for the accessor
}


Property Decorator
A property decorator is applied to a property within a class and has two parameters.

function propertyDecorator(target: Object, propertyKey: string | symbol) {
  // target is the prototype of the class (for instance properties)
  // or the constructor function (for static properties)
  // propertyKey is the name of the property
}