Using the clear() method

You don't actually have to create a utility function to empty collections by replacing them with new instances. The clear() method does the same thing:

const myList = List.of(1, 2);
const myMap = Map.of('one', 1, 'two', 2);

// Create new instances by emptying the
// existing instances.
const myEmptyList = myList.clear();
const myEmptyMap = myMap.clear();

console.log('myList', myList.toJS());
// -> myList [ 1, 2 ]
console.log('myEmptyList', myEmptyList.toJS());
// -> myEmptyList []
console.log('myMap', myMap.toJS());
// -> myMap { one: 1, two: 2 }
console.log('myEmptyMap', myEmptyMap.toJS());
// -> myEmptyMap {}

The benefit with the clear() method is that you don't have to invent a utility function that returns new collection instances based on type. Another advantage is that the clear() method will first check to see if the collection is already empty and, if so, it will return the current collection.