handler.get()

const monster = {
  secret: "easily scared",
  eyeCount: 4,
};
const handler = {
  get(target, prop, receiver) {
    if (prop === "secret") {
      return `${target.secret.substring(0, 4)} ... shhhh!`;
    }
    return Reflect.get(...arguments);
  },
};
const proxy = new Proxy(monster, handler);
console.log(proxy.eyeCount);
// 予想される結果: 4
console.log(proxy.secret);
// 予想される結果: "easi ... shhhh!"

new Proxy(target, {
  get(target, property, receiver) {
  }
})

const p = new Proxy(
  {},
  {
    get(target, property, receiver) {
      console.log(`called: ${property}`);
      return 10;
    },
  },
);
console.log(p.a);
// "called: a"
// 10

const obj = {};
Object.defineProperty(obj, "a", {
  configurable: false,
  enumerable: false,
  value: 10,
  writable: false,
});
const p = new Proxy(obj, {
  get(target, property) {
    return 20;
  },
});
p.a; // TypeError is thrown