I have this code that generated PDF file:

async function toPDFile(file) {
  let done = await libreConvert(file, '.pdf', undefined);
  return done
}

toPDFile(templateFile).then(successCallback, failureCallback);

function successCallback(result) {
  console.log(result);
}

function failureCallback(error) {
  console.log(error);
}

console.log(result) returns Buffer but when I assign it to var it returns undefined. How can I just get value like a normal human being?