Robuta

https://www.jetbrains.com/help/inspectopedia/ReturnTypeCanBeNotNullable.html

Return type of a function can be made non-nullable | Inspectopedia Documentation

return type function made non nullable

https://www.jetbrains.com/help/resharper/2021.3/MultipleNullableAttributesUsage.html

Code Inspection: Multiple nullable attributes usage | ReSharper

code inspection multiple nullable attributes