stylelint-bundle-worker.js
function safeCall (fn, args) {
  // Get the function arguments as an array
  args = Array.prototype.slice.call(arguments, 1);

  // Replace the callback function with a wrapper that ensures it will only be called once
  let callback = call.once(args.pop());
  args.push(callback);

  try {
    fn.apply(null, args);
  }
  catch (err) {
    callback(err);
  }
}
function safeCall (fn, args) {
  // Get the function arguments as an array
  args = Array.prototype.slice.call(arguments, 1);

  // Replace the callback function with a wrapper that ensures it will only be called once
  let callback = call.once(args.pop());
  args.push(callback);

  try {
    fn.apply(null, args);
  }
  catch (err) {
    callback(err);
  }
}
Calls a function with the given arguments, and ensures that the error-first callback is _always_
invoked exactly once, even if the function throws an error.

@param {function} fn - The function to invoke
@param {...*} args - The arguments to pass to the function. The final argument must be a callback function.