How to avoid no-param-reassign when setting a property on a DOM object

Question

I have a method which\'s main purpose is to set a property on a DOM object

function (el) {
  el.expando = {};
}

I use AirBnB\'s code style

Answer 1

You can use:

(param) => {
  const data = Object.assign({}, param);
  data.element = 'some value';
}