Snippet about typescript decorators this binding

typescript-decorators-this.ts

const authorize = () => (
  target: any,
  propertyKey: string,
) => {
  let next: any;
  const getter = () => next;
  const setter = (old: any) => {
    next = () => {
        return old() +1;
    }
  };
  Object.defineProperty(target, propertyKey, {
    get: getter,
    set: setter,
    configurable: true,
    enumerable: true,
  });
};


const authorizeP = () => (
  target: any,
  propertyKey: string,
  descriptor: any
) => {
    const originalMethod = descriptor.value;
    descriptor.value = function() {
       return originalMethod.apply(this) + 1;
    };
    
};



class A {
    public b =3;

    @authorizeP()
    @authorizeP()
    public m (){
      console.log(this.b);
        return 1;
    }
}

const a = new A();
a.b = 5;
console.log(a.m())