使用 TS 装饰器时未定义 PropertyDescriptor

Question

TS Decorator

function exampleDeco(): any {
  return function (
    target: any,
    propertyKey: string,
    descriptor: PropertyDescriptor
  ) {
    console.log(descriptor?.value, "descriptor");
    return descriptor;
  };
}

Result:

undefined descriptor

Function used on

@exampleDeco()
public exampleFn = (
  ) => { console.log('function') }

I don't know why it's logging undefined in the decorator.

Answer 1

It was due to the use of TS decorator on the arrow function ()=>{} . It will work just fine if you use it on a normal JS function. Not sure why it is behaving like this though.