1open Wonka_types; 2 3let mergeMap: ((.'a) => sourceT('b), sourceT('a), sinkT('b)) => unit; 4let merge: (array(sourceT('a)), sinkT('a)) => unit; 5let mergeAll: (sourceT(sourceT('a)), sinkT('a)) => unit; 6let flatten: (sourceT(sourceT('a)), sinkT('a)) => unit;