MessageFormat translations resulting in warning messages

[fidelpita]

When using MessageFormat translations such as:
console.log(_t("someContext_{NUM, plural, one{1 hamburger} other{# hamburgers}}", { NUM: 2 }));
the following warning is generated:
Expected '===' and instead saw '=='
at the following return line:

var es = function(n, ord) {
  if (ord) return 'other';
  return (n == 1) ? 'one' : 'other';
};

Perhaps the messageformat dependency needs to be updated?
Context: using the latest version of create-react-app