interface Admin {
    name: string
    privileges: string[]
}

interface Employee {
    name: string
    startDate: Date
}

type UnknownEmployee = Employee | Admin

function printEmployeeInformation(emp: UnknownEmployee) {
    console.log('Name: ' + emp.name)
    if ('privileges' in emp) {
        console.log('Privileges: ' + emp.privileges)
    }
    if ('startDate' in emp) {
        console.log('Start Date: ' + emp.startDate)
    }
}