Decrypt one level of a generic object without compromising on it's structure

decrypt.ts

type IData = { [keys: string]: number };

const encrypted1: IData = {
  a: 10,
  b: 20,
  c: 30,
};

const encrypted2: IData = {
  d: 40,
  e: 50,
  f: 60,
};

function decrypt(data: IData): IData {
  const result: IData = {};
  for (const key in data) {
    if (Object.prototype.hasOwnProperty.call(data, key)) {
      // custom decryption step
      const decrypting = data[key] / 10;
      result[key] = decrypting;
    }
  }
  return result;
}

const decrypted1: IData = decrypt(encrypted1);
decrypted1; // { a: 1, b: 2, c: 3 }
const decrypted2: IData = decrypt(encrypted2);
decrypted2; // { d: 4, e: 5, f: 6 }