How to use

emit

function

in

EventEmitter

/**
 * Set current user to given value
 *
 * @param  {Object|void} user
 * @return {void}
 */
function setUser(value = null) {
 let changedState

 if (!!user !== !!value) { changedState = true }

 user = value

 app.set('user', user)
 events.emit('change', user)
 if (changedState) { events.emit('change-state', changedState) }
}