I think there is a way to get all of the "good parts" of Typescript, mainly type checking, without introducing the bad, mainly transpiling. I recently started just running Typescript on Javascript files, where all of the types are specified via JSDocs. It was a refreshing experience, and I highly recommend. The Typescript website[1] has pretty good documentation for it.
[1]: https://www.typescriptlang.org/docs/handbook/jsdoc-supported...