// {
//   id
//   created
//   employee
//     - id
//     - firstname
//     - employeeType
//      - id
//     - lastname
//   location
// }

const addIndent = number => [...Array(number).keys()].reduce(prev => `${prev}-`, "");

const fn = str => {
  let indent = -1;
  let output = "";

  str.split("").filter(char => char !== " ").map(char => {
    if (char === "(") indent++;
    if (char === ")") {
      indent--;
      return;
    };

    output += ["(", ","].includes(char) ? `\n${addIndent(indent)}` : char;
  });

  console.log(output);
};

fn("(id,created,employee(id,firstname,employeeType(id), lastname),location)");