F# does have type alias. It takes the form type newname = oldname You can do things like type LoadReceipt = RecordId -> Record let sqlLoad: LoadReceipt = i

F# does have type alias. It takes the form type newname = oldname You can do things like type LoadReceipt = RecordId -> Record let sqlLoad: LoadReceipt = implementation let noSqlLoad: LoadReceipt = implementation You can use it like an interface, and accept loadReceipt functions for anyone who needs to load receipts... Then partially apply a SQL version, noSQL version etc. I use this in my code.