NamedError - easily set the error 'name' property without defining a new class

NamedError.js

function NamedError(name, message, extra) {
  Error.captureStackTrace(this, this.constructor);
  this.name = name;
  this.message = message;
  this.extra = extra;
};
require('util').inherits(NamedError, Error);
module.exports = NamedError;