SyntaxError: function statement requires a name

function () {
  return "Hello world";
}
// SyntaxError: function statement requires a name

const greet = function () {
  return "Hello world";
};

(function () {
  // …
})();

function Greeter() {
  german: function () {
    return "Moin";
  }
}
// SyntaxError: function statement requires a name

function Greeter() {
  function german() {
    return "Moin";
  }
}

const greeter = {
  german: function () {
    return "Moin";
  },
};

const greeter = {
  german() {
    return "Moin";
  },
};

promise.then(
  function () {
    console.log("success");
  });
  function () {
    console.log("error");
}
// SyntaxError: function statement requires a name

promise.then(
  function () {
    console.log("success");
  },
  function () {
    console.log("error");
  },
);