type DataTypesTest = ExcelFile<"testsExcelProvider.TestsDataTypes.xlsx">

A direct reference to the generated type 'ExcelFile' is not permitted. Instead, use a type definition, e.g. 'type TypeAlias = <path>'. This indicates that a type provider adds generated types to your assembly.

// add a parameterless constructor which loads the file that was used to define the schema
let ctor = ProvidedConstructor([])
ctor.BaseConstructorCall <- fun [] -> <@@ ExcelFileInternal(resolvedFilename, range) @@>
providedExcelFileType.AddMember(ctor)