09-user-adapter.ts

interface User {
  firstName: string;
  middleName?: string;
  lastName: string;
  email: string;
  balance: number;
  currency: string;
  locale: string;
}

interface UserProxy extends User {
  fullName: string;
  balance: string;
}

const adapter = (user: User) => {
  // Redefined properties
  const balance = user.balance as unknown as string;

  // New properties
  const newProps = {
    fullName: "",
  };

  return { ...user, ...newProps, balance };
};


const handleGet = (obj: UserProxy, prop: string | symbol) => {
  /* ... */
};

export const createUserDataProxy = (user: User): UserProxy => {
  const proxy = new Proxy(adapter(user), {
    get: handleGet,
  });

  return proxy;
};