useState not reading variable outside of if statement

I'm trying to set a variable "list" in an "if" statement, and after that, update my data via useState, but if I write setData outside the "if" statement, it shows that the variable "list" is not defined, so I must rewrite all the code inside the "if" and the "else" statement (which is not desirable)

const [data, setData] = useState({
  name: "",
  email: "",
  machinetype: [],
});

const handleInputChange = (event) => {
  if (event.target.name === "machinetype") {
    const chck = event.target.checked;
    if (chck) {
      const list = data[event.target.name].concat([event.target.value]);
    } else {
      const index = data[event.target.name].indexOf(event.target.value);
      const remove = data[event.target.name].splice(index, 1);
      const list = data[event.target.name];
    }
    setData({
      ...data,
      [event.target.name]: list,
    });
  }
};

Any advices? Thanks