isUnionType isUnionType(t: Type): Boolean Returns true if the input type is the Union type. Introduced in DataWeave version 2.3.0. Parameters Name Description t The type to check. Example This example shows how isUnionType behaves with different inputs. Source %dw 2.0 import * from dw::core::Types type AType = String | Number output application/json --- { a: isUnionType(AType), b: isUnionType(Boolean), } Output { "a": true, "b": false }