gistfile1.js

const fun = ({param1 = 'some default value', param2 = 'other default value'} = {}) => {
  console.log(param1);
  console.log(param2);
  console.log(options); // Can I somehow get access to the object that has param1 and param2 inside?
  console.log(arguments[0]); // Is this the only way?
};

Right, @naholyr’s code is the actual solution, I showed how to use a rest parameter instead of arguments.