ts装饰器保存this指向

要使用 function 而不是 箭头函数

interface MethodDecorator<T> {
  (
    target: Object,
    propertyKey: string | symbol,
    descriptor: TypedPropertyDescriptor<T>
  ): TypedPropertyDescriptor<T> | void;
}

type TMethodDecorator = MethodDecorator<any>;

const matchImport: TMethodDecorator = (target, propertyKey, descriptor) => {
  const callback = descriptor.value;

  descriptor.value = function (...args: any[]) {
    console.log("decorator", this);
    return callback.call(this, ...args);
  };
};

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20