enum typescript return specific value

I have an enum like this:

enum Test {
   'type1',
   'type2',
   'type3',
   'type4',
   'type5'
}

function getType(num: number) {

}

what I want is if num = 1, return type1, if num = 2, return type2, if num >= 5, return type5.

How can I do this in getType ?

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