Type Alias DayMap

type DayMap = { readonly MO: 1; readonly TU: 2; readonly WE: 3; readonly TH: 4; readonly FR: 5; readonly SA: 6; readonly SU: 7; readonly MON: 1; readonly TUE: 2; readonly WED: 3; readonly THU: 4; readonly FRI: 5; readonly SAT: 6; readonly SUN: 7; }