https://twitter.com/therealyashsriv/status/1219691914523545601

We shouldn't generate code that might cause browser or linting to complain.

https://github.com/facebook/react/blob/0cf22a56a18790ef34c71bef14f64695c0498619/packages/legacy-events/SyntheticEvent.js#L259

It's also just a confusing pattern at best.
let s = '';
  for (let i = 0; i < arr.length; i++) {
    s += arr[i];
    if (i === 0 && arr.length === 2) {
      s += ' and ';
    } else if (i === arr.length - 2 && arr.length > 2) {
      s += ', and ';
    } else if (i < arr.length - 1) {
      s += ', ';
    }
  }
  return s;
}
function isNodeLike(val) {