A JavaScript Map object has the type Map<K, V>. I would like to create a type that matches V.

For example:

function addItemToMap(map: Map) {
    return function addItem(id: string, item: V) {
       return map.set(id, item)
    }
}

When I call this function, I’d like to be sure that the item I’m passing is able to be added to the map:

// This should ensure that `bar` is a value that can go into the map `foo`
addItemToMap(foo)('x', bar)

TypeScript playground with a slightly more through example