Flow Type had a way of embedding type code in JS block comments [1]. There is an open issue for Typescript, but it looks it didn't went too far [2] [1]: https:

Flow Type had a way of embedding type code in JS block comments [1]. There is an open issue for Typescript, but it looks it didn't went too far [2] [1]: https://flow.org/en/docs/types/comments/ https://flow.org/en/docs/types/comments/ [2]: https://github.com/microsoft/TypeScript/issues/9694 https://github.com/microsoft/TypeScript/issues/9694