isPeriodType

%dw 2.0
import * from dw::core::Types
type APeriod = Period
output application/json
---
{
   a: isPeriodType(APeriod),
   b: isPeriodType(Period),
   c: isPeriodType(String),
}

{
  "a": true,
  "b": true,
  "c": false
}