I still use it a lot, particularly in unit tests and configuration. Take the tests of the CSV package, for example https://github.com/adaltas/node-csv/blob/master/packages/csv..., once you get used to its syntax, it is easier to read than plain JS. For Nikita, TypeScript would be appealing for code completion. In term of type checking, it will be double usage since all arguments are checked at runtime with JSON schema.