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Lately I've been working with discriminated unions more and more, and I found myself writing a lot of the same boilerplate code over and over again, so I wrote disc-union to help with creating and managing discriminated union types. It allows you to easily define your types by simply writing constructor functions for them, and Typescript's type inference does the rest. It also provides functions for exhaustive type-safe matching and other common tasks.
About half-way through writing this library I discovered that Variant existed... and does a great job at doing the exact same things (and more). I might not have started if I knew about that, but I'm glad I did because it has been a great learning experience!