The managePage module could be in full-on module structure such as follows:
const managePage = (function makeManagePage() {
function addPlayer(...) {
...
}
return {
add: addPlayer
};
}());
or it could be a single object:
const managePage = {
add: function addPlayer(...) {
...
}
};
The benefit of the more full module structure is that it makes it easier for you to add on other things as needs dictate,